Ddr3 Memory For Mac

Choose your iMac model

About 6 months later the macbook died and I had to get the logic board replaced. The thing is: 'the guy' at the repair shop said the ram was probably the cause, because using a low-voltage ram on the system originally designed to use DDR3 ram caused the system to. Speed for Mac systems. A memory upgrade is the fastest, easiest, and most affordable way to get more performance out of your Mac system. Upgrade your Mac with Crucial memory modules and maximize your creativity with top speed and high density DDR3 and DDR4 memory modules. ValueSelect is a full line of standard DDR2 and DDR3 memory upgrade kits for home and office desktop and notebook PCs. They are carefully screened by Corsair for reliable operation and backed by our lifetime warranty. See all Laptop Memory. 'Great for my mac. 4GB Apple PC3-14900 DDR3-1866MHz ECC DIMM Memory For MAC Pro 2013 MF623G/A. Genuine Apple 4GB 1866MHz DDR3 PC3-14900E ECC Memory Module for 2013 Mac Pro. Apple 8GB ( 2x 4GB) MacBook Pro Mac Mini Memory DDR3 SODIMM 1600MHZ 12800S. Got one to sell? Get it in front of 160+ million buyers. Microcenter.com has the best deals on Apple Memory, Mac RAM, iMAC Memory, Mac Mini RAM, and Apple Memory Upgrades all available at your local Micro Center Computer Store! Compare Item 16GB DDR3-1600 (PC3-12800) CL11 SODIMM Laptop Kit (Two 8GB Apple Memory Modules) Compare.

If you're not sure which iMac you have, you can identify your iMac and then select it from the list below.

27-inch

24-inch

21.5-inch

iMac (Retina 4K, 21.5-inch, 2019)*
iMac (Retina 4K, 21.5-inch, 2017)*
iMac (21.5-inch, 2017)*
iMac (21.5 inch, Mid 2014)*
iMac (21.5-inch, Late 2013)*
iMac (21.5-inch, Late 2012)*

20-inch

17-inch

* Memory is not removable by users on iMac (21.5-inch, Late 2012), iMac (21.5-inch, Late 2013), iMac (21.5-inch, Mid 2014), iMac (21.5-inch, 2017), iMac (Retina 4K, 21.5-inch, 2017), and iMac (Retina 4K, 21.5-inch, 2019). If the memory in one of these computers needs repair service, contact an Apple Retail Store or Apple Authorized Service Provider. If you’d like to upgrade the memory in one of these models, an Apple Authorized Service Provider can help. Before you schedule an appointment, confirm that the specific Apple Authorized Service Provider offers memory upgrade services.

Memory in iMac (21.5-inch, Late 2015), and iMac (Retina 4K, 21.5-inch, Late 2015) is not upgradeable.

iMac (Retina 5K, 27-inch, 2020)

Get memory specifications for iMac (Retina 5K, 27-inch, 2020), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8GB (2 x 4GB DIMMs)
Maximum memory	128GB (4 x 32GB DIMMs)

For optimal memory performance, DIMMs should be the same capacity, speed, and vendor. Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

PC4-21333
Unbuffered
Nonparity
260-pin
2666MHz DDR4 SDRAM

If you have mixed capacity DIMMs, see the install memory section for installation recommendations.

iMac (Retina 5K, 27-inch, 2019)

Get memory specifications for iMac (Retina 5K, 27-inch, 2019), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8GB (2 x 4GB DIMMs)
Maximum memory	64GB (4 x 16GB DIMMs)

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

PC4-21333
Unbuffered
Nonparity
260-pin
2666MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, 2017)

Get memory specifications for iMac (Retina 5K, 27-inch, 2017), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8GB (2 x 4GB DIMMs)
Maximum memory	64GB (4 x 16GB DIMMs)

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

PC4-2400 (19200)
Unbuffered
Nonparity
260-pin
2400MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, Late 2015)

Get memory specifications for iMac (Retina 5K, 27-inch, Late 2015), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8GB
Maximum memory	32GB

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

PC3-14900
Unbuffered
Nonparity
204-pin
1867MHz DDR3 SDRAM

For these 27-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

iMac (Retina 5K, 27-inch, Mid 2015)
iMac (Retina 5K, 27-inch, Late 2014)
iMac (27-inch, Late 2013)
iMac (27-inch, Late 2012)

Memory specifications

These iMac models feature Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8GB
Maximum memory	32GB

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

PC3-12800
Unbuffered
Nonparity
204-pin
1600MHz DDR3 SDRAM

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

Disconnect the power cord and all other cables from your computer.
Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
Open the memory compartment door by pressing the small grey button located just above the AC power port:
The memory compartment door will open as the button is pushed in. Remove the compartment door and set it aside:
A diagram on the underside of the compartment door shows the memory cage levers and the orientation of the DIMM. Locate the two levers on the right and left sides of the memory cage. Push the two levers outward to release the memory cage:
After the memory cage is released, pull the memory cage levers toward you, allowing access to each DIMM slot.
Remove a DIMM by pulling the module straight up and out. Note the location of the notch on the bottom of the DIMM. When reinstalling DIMMs, the notch must be oriented correctly or the DIMM won't fully insert:
Replace or install a DIMM by setting it down into the slot and pressing firmly until you feel the DIMM click into the slot. When you insert a DIMM, make sure to align the notch on the DIMM to the DIMM slot. Find your model below for specific installation instructions and notch locations:
- iMac (Retina 5K, 27-inch, 2020) DIMMs have a notch on the bottom, slightly left of the middle. If your DIMMs are mixed in capacity, minimize the capacity difference between Channel A (slots 1 and 2) and Channel B (slots 3 and 4) when possible.
- iMac (Retina 5K, 27-inch, 2019) DIMMs have a notch on the bottom, slightly left of the middle:
- iMac (27-inch, Late 2012) and iMac (Retina 5K, 27-inch, 2017) DIMMs have a notch on the bottom left:
- iMac (27-inch, Late 2013) and iMac (Retina 5K, 27-inch, Late 2014, Mid 2015, and Late 2015) DIMMs have a notch on the bottom right:
After you install all of your DIMMs, push both memory cage levers back into the housing until they lock into place:
Replace the memory compartment door. You don't need to press the compartment door release button when replacing the compartment door.
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

Your iMac performs a memory initialization procedure when you first turn it on after upgrading memory or rearranging DIMMs. This process can take 30 seconds or more, and the display of your iMac remains dark until it's finished. Make sure to let the memory initialization complete.

For these 27-inch and 21.5-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

iMac (27-inch, Mid 2011)
iMac (21.5-inch, Mid 2011)
iMac (27-inch, Mid 2010)
iMac (21.5-inch, Mid 2010)
iMac (27-inch, Late 2009)
iMac (21.5-inch, Late 2009)

Memory specifications

Number of memory slots	4
Base memory	4GB (but is configured to order)
Maximum memory	16GB For iMac (Late 2009), you can use 2GB or 4GB RAM SO-DIMMs of 1066MHz DDR3 SDRAM in each slot. For iMac (Mid 2010) and iMac (Mid 2011), use 2GB or 4GB RAM SO-DIMMs of 1333MHz DDR3 SDRAM in each slot.

Ddr3 Ram For Mac Mini 2011

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

iMac (Mid 2011)	iMac (Mid 2010)	iMac (Late 2009)
PC3-10600	PC3-10600	PC3-8500
Unbuffered	Unbuffered	Unbuffered
Nonparity	Nonparity	Nonparity
204-pin	204-pin	204-pin
1333MHz DDR3 SDRAM	1333MHz DDR3 SDRAM	1066MHz DDR3 SDRAM

i5 and i7 Quad Core iMac computers come with both top memory slots populated. These computers will not start up if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot.

Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. ('Top' and 'bottom' slots refer to the orientation of the slots in the pictures below. 'Top' refers to the slots closest to the display; 'bottom' refers to the slots closest to the stand.)

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

Disconnect the power cord and all other cables from your computer.
Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
Using a Philips screwdriver, remove the RAM access door in the bottom of your computer:
Remove the access door and set it aside.
Untuck the tab in the memory compartment. If you're replacing a memory module, gently pull the tab to eject any installed memory module:
Insert your new or replacement SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown below.
After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly:
Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

For these 24-inch and 20-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

iMac (24-inch, Early 2009)
iMac (20-inch, Early 2009)
iMac (24-inch, Early 2008)
iMac (20-inch, Early 2008)
iMac (24-inch Mid 2007)
iMac (20-inch, Mid 2007)

Memory specifications

These iMac computers have two side-by-side Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer.

The maximum amount of random-access memory (RAM) you can install in each computer is:

Computer	Memory Type	Maximum Memory
iMac (Mid 2007)	DDR2	4GB (2x2GB)
iMac (Early 2008)	DDR2	4GB (2x2GB)
iMac (Early 2009)	DDR3	8GB (2x4GB)

You can use a 1GB or 2GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). Use 1GB, 2GB, or 4GB modules in each slot for the iMac (Early 2009).

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

iMac (Mid 2007)	iMac (Early 2008)	iMac (Early 2009)
PC2-5300	PC2-6400	PC3-8500
Unbuffered	Unbuffered	Unbuffered
Nonparity	Nonparity	Nonparity
200-pin	200-pin	204-pin
667MHz DDR2 SDRAM	800MHz DDR2 SDRAM	1066MHz DDR3 SDRAM

DIMMs with any of the following features aren't supported:

Registers or buffers
PLLs
Error-correcting code (ECC)
Parity
Extended data out (EDO) RAM

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After your iMac cools down, follow these steps:

Disconnect the power cord and all other cables from your computer.
Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
Using a Philips screwdriver, remove the RAM access door in the bottom of the computer:
Remove the access door and set it aside.
Untuck the tab in the memory compartment. If you're replacing a memory module, untuck the tab and pull it to eject any installed memory module:
Insert your new or replacement RAM SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown above.
After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly.
Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

For these 20-inch and 17-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

iMac (20-inch Late 2006)
iMac (17-inch, Late 2006 CD)
iMac (17-inch, Late 2006)
iMac (17-inch, Mid 2006)
iMac (20-inch, Early 2006)
iMac (17-inch, Early 2006)

Memory specifications

Number of memory slots	2
Base memory	1GB	Two 512MB DIMMs; one in each of the memory slots	iMac (Late 2006)
	512MB	One DDR2 SDRAM installed into the top slot	iMac (17-inch Late 2006 CD)
	512MB	Two 256MB DIMMs; one in each of the memory slots	iMac (Mid 2006)
	512MB	One DDR2 SDRAM installed into the top slot	iMac (Early 2006)
Maximum memory	4GB	2 GB SO-DIMM in each of the two slots*	iMac (Late 2006)
Maximum memory	2GB	1GB SO-DIMM in each of the two slots	iMac (17-inch Late 2006 CD) iMac (Early 2006)
Memory card specifications	Compatible: - Small Outline Dual Inline Memory Module (DDR SO-DIMM) format - PC2-5300 - Nonparity - 200-pin - 667 MHz - DDR3 SDRAM		Not compatible: - Registers or buffers - PLLs - ECC - Parity - EDO RAM

For best performance, fill both memory slots, installing an equal memory module in each slot.
*iMac (Late 2006) uses a maximum of 3 GB of RAM.

Installing memory in the bottom slot

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

Disconnect the power cord and all other cables from your computer.
Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
Move the DIMM ejector clips to their fully open position:
Insert your RAM SO-DIMM into the bottom slot, keeping in mind the orientation of the keyed SO-DIMM:
After you insert it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this might damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
Close the ejector clips:
Reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

Replacing memory in the top slot

After you shut down your iMac and give it time to cool, follow these steps:

Disconnect the power cord and all other cables from your computer.
Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
Pull the two levers on each side of the memory compartment to eject the memory module that's already installed:
Remove the memory module from your iMac as shown below:
Insert your RAM SO-DIMM into the top slot, noting the orientation of the keyed SO-DIMM:
After you insert it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this might damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
Close the ejector clips:
Reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

If your iMac makes a tone after you install memory

iMac models introduced before 2017 might make a warning sound when you start up after installing or replacing memory:

One tone, repeating every five seconds signals that no RAM is installed.
Three successive tones, then a five-second pause (repeating) signals that RAM doesn't pass a data integrity check.

If you hear these tones, confirm that the memory you installed is compatible with your iMac and that it's installed correctly by reseating the memory. If your Mac continues to make the tone, contact Apple Support.

Confirm that your iMac recognizes its new memory

After you install memory, you should confirm that your iMac recognizes the new RAM by choosing Apple () menu > About This Mac.

The window that appears lists the total memory, including the amount of memory that originally came with the computer plus the newly added memory. If all the memory in the iMac has been replaced, it lists the new total of all installed RAM.

For detailed information about the memory installed in your iMac, click System Report. Then choose Memory under the Hardware section in the left side of System Information.

If your computer doesn't recognize the memory or doesn't start up correctly, confirm that the RAM you installed is compatible with your iMac and that it's installed correctly by reseating the memory. If you continue to have issues with the memory in your iMac, contact Apple Support.

Choose your iMac model

If you're not sure which iMac you have, you can identify your iMac and select it from the list below.

27-inch

24-inch

21.5-inch

iMac (Retina 4K, 21.5-inch, 2019)*
iMac (Retina 4K, 21.5-inch, 2017)*
iMac (21.5-inch, 2017)*
iMac (21.5 inch, Mid 2014)*
iMac (21.5-inch, Late 2013)*
iMac (21.5-inch, Late 2012)*

20-inch

17-inch

* Memory is not removable by users on iMac (21.5-inch, Late 2012), iMac (21.5-inch, Late 2013), iMac (21.5-inch, Mid 2014), iMac (21.5-inch, 2017), iMac (Retina 4K, 21.5-inch, 2017) and iMac (Retina 4K, 21.5-inch, 2019). If the memory in one of these computers needs a service to repair it, contact an Apple Retail Store or Apple Authorised Service Provider. If you’d like to upgrade the memory in one of these models, an Apple Authorised Service Provider can help. Before you schedule an appointment, confirm that the specific Apple Authorised Service Provider offers memory upgrade services.

Memory in iMac (21.5-inch, Late 2015) and iMac (Retina 4K, 21.5-inch, Late 2015) is not upgradeable.

iMac (Retina 5K, 27-inch, 2020)

Get memory specifications for iMac (Retina 5K, 27-inch, 2020), then find out how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8 GB (2 x 4 GB DIMMs)
Maximum memory	128 GB (4 x 32 GB DIMMs)

For optimal memory performance, DIMMs should have the same capacity and speed, and be from the same vendor. Use small outline dual inline memory modules (SO-DIMM) that meet all of these criteria:

PC4-21333
Unbuffered
Non-parity
260-pin
2666 MHz DDR4 SDRAM

If you have mixed capacity DIMMs, see the install memory section for installation recommendations.

iMac (Retina 5K, 27-inch, 2019)

Get memory specifications for iMac (Retina 5K, 27-inch, 2019), then find out how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8 GB (2 x 4 GB DIMMs)
Maximum memory	64 GB (4 x 16 GB DIMMs)

Use small outline dual inline memory modules (SO-DIMM) that meet all of these criteria:

PC4-21333
Unbuffered
Non-parity
260-pin
2666 MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, 2017)

Get memory specifications for iMac (Retina 5K, 27-inch, 2017), then find out how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8 GB (2 x 4 GB DIMMs)
Maximum memory	64 GB (4 x 16 GB DIMMs)

Use small outline dual inline memory modules (SO-DIMM) that meet all of these criteria:

PC4-2400 (19200)
Unbuffered
Non-parity
260-pin
2400 MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, Late 2015)

Get memory specifications for iMac (Retina 5K, 27-inch, Late 2015), then find out how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8 GB
Maximum memory	32 GB

Use small outline dual inline memory modules (SO-DIMM) that meet all of these criteria:

MacBook Air packs heavy-duty performance into just 2.8 pounds. Sir2 for macbook air. With millions of colors, everything you see is rich and vibrant. And you’re going to love what you see. The available quad-core Intel Core i7 processor delivers up to 2x faster CPU performance and up to 80 percent faster graphics performance, to help you power through everything from browsing the web to playing games to editing video. The display glass goes right to the edge of the enclosure, so you can focus on what’s on your screen.

PC3-14900
Unbuffered
Non-parity
204-pin
1867 MHz DDR3 SDRAM

For these 27-inch models

Get memory specifications for the following iMac models, then find out how to install memory in them:

iMac (Retina 5K, 27-inch, Mid 2015)
iMac (Retina 5K, 27-inch, Late 2014)
iMac (27-inch, Late 2013)
iMac (27-inch, Late 2012)

Memory specifications

These iMac models feature Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots	4
Base memory	8 GB
Maximum memory	32 GB

Use small outline dual inline memory modules (SO-DIMM) that meet all of these criteria:

PC3-12800
Unbuffered
Non-parity
204-pin
1600 MHz DDR3 SDRAM

Installing memory

The internal components of your iMac can get warm. If you've been using your iMac, wait 10 minutes after shutting it down to allow the internal components to cool.

After you've shut down your iMac and given it some time to cool down, follow these steps:

Disconnect the power cable and all other cables from your computer.
Place a soft, clean towel or cloth on a desk or other flat surface to prevent the display from getting scratched.
Hold the sides of the computer and slowly place the computer face down on the towel or cloth.
Open the memory compartment door by pressing the small grey button that's located just above the AC power port:
The memory compartment door will open as the button is pushed in. Remove the compartment door and set it aside:
A diagram on the underside of the compartment door shows the memory cage levers and the orientation of the DIMM. Locate the two levers on the right- and left-hand sides of the memory cage. Push the two levers outwards to release the memory cage:
After the memory cage has been released, pull the memory cage levers towards you, allowing access to each DIMM slot.
Remove a DIMM by pulling the module straight up and out. Note the location of the notch on the bottom of the DIMM. When reinstalling DIMMs, the notch must be orientated correctly or the DIMM won't be inserted fully:
Replace or install a DIMM by setting it down into the slot and pressing firmly until you feel the DIMM click into the slot. When you insert a DIMM, make sure you align the notch on the DIMM with the DIMM slot. Find your model below for specific installation instructions and notch locations:
- iMac (Retina 5K, 27-inch, 2020) DIMMs have a notch on the bottom, slightly to the left of centre. If your DIMMs are mixed in capacity, minimise the capacity difference between Channel A (slots 1 and 2) and Channel B (slots 3 and 4) when possible.
- iMac (Retina 5K, 27-inch, 2019) DIMMs have a notch on the bottom, slightly to the left of centre:
- iMac (27-inch, Late 2012) and iMac (Retina 5K, 27-inch, 2017) DIMMs have a notch on the bottom left:
- iMac (27-inch, Late 2013) and iMac (Retina 5K, 27-inch, Late 2014, Mid 2015 and Late 2015) DIMMs have a notch on the bottom right:
After you've installed all of your DIMMs, push both memory cage levers back into the housing until they lock into place:
Replace the memory compartment door. You don't need to press the compartment door release button when replacing the compartment door.
Place the computer in its upright position. Reconnect the power cable and all other cables to the computer, then start up the computer.

Your iMac will perform a memory initialisation procedure when you first turn it on after upgrading memory or rearranging DIMMs. This process can take 30 seconds or more, and the display of your iMac will remain dark until it's finished. Make sure you allow the memory initialisation process to be completed.

For these 27-inch and 21.5-inch models

Get memory specifications for the following iMac models, then find out how to install memory in them:

iMac (27-inch, Mid 2011)
iMac (21.5-inch, Mid 2011)
iMac (27-inch, Mid 2010)
iMac (21.5-inch, Mid 2010)
iMac (27-inch, Late 2009)
iMac (21.5-inch, Late 2009)

Memory specifications

Number of memory slots	4
Base memory	4 GB (but is configured to order)
Maximum memory	16 GB For iMac (Late 2009), you can use 2 GB or 4 GB RAM SO-DIMMs of 1066 MHz DDR3 SDRAM in each slot. For iMac (Mid 2010) and iMac (Mid 2011), use 2 GB or 4 GB RAM SO-DIMMs of 1333 MHz DDR3 SDRAM in each slot.

Use small outline dual inline memory modules (SO-DIMM) that meet all of these criteria:

iMac (Mid 2011)	iMac (Mid 2010)	iMac (Late 2009)
PC3-10600	PC3-10600	PC3-8500
Unbuffered	Unbuffered	Unbuffered
Non-parity	Non-parity	Non-parity
204-pin	204-pin	204-pin
1333 MHz DDR3 SDRAM	1333 MHz DDR3 SDRAM	1066 MHz DDR3 SDRAM

Installing memory

The internal components of your iMac can get warm. If you've been using your iMac, wait 10 minutes after shutting it down to allow the internal components to cool.

After you've shut down your iMac and given it some time to cool down, follow these steps:

Disconnect the power cable and all other cables from your computer.
Place a soft, clean towel or cloth on a desk or other flat surface to prevent the display from getting scratched.
Hold the sides of the computer and slowly place the computer face down on the towel or cloth.
Using a Phillips screwdriver, remove the RAM access door in the bottom of your computer:
Remove the access door and set it aside.
Untuck the tab in the memory compartment. If you're replacing a memory module, gently pull the tab to eject any installed memory module:
Insert your new or replacement SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown below.
After you've inserted it, press the DIMM up into the slot. There should be a slight click when the memory has been seated correctly:
Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cable and all other cables to the computer, then start up the computer.

For these 24-inch and 20-inch models

Get memory specifications for the following iMac models, then find out how to install memory in them:

iMac (24-inch, Early 2009)
iMac (20-inch, Early 2009)
iMac (24-inch, Early 2008)
iMac (20-inch, Early 2008)
iMac (24-inch, Mid 2007)
iMac (20-inch, Mid 2007)

Memory specifications

These iMac computers have two side-by-side Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer.

The maximum amount of random-access memory (RAM) you can install in each computer is:

Computer	Memory Type	Maximum Memory
iMac (Mid 2007)	DDR2	4 GB (2 x 2 GB)
iMac (Early 2008)	DDR2	4 GB (2 x 2 GB)
iMac (Early 2009)	DDR3	8 GB (2 x 4 GB)

You can use a 1 GB or 2 GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). Use 1 GB, 2 GB or 4 GB modules in each slot for the iMac (Early 2009).

Use small outline dual inline memory modules (SO-DIMM) that meet all of these criteria:

iMac (Mid 2007)	iMac (Early 2008)	iMac (Early 2009)
PC2-5300	PC2-6400	PC3-8500
Unbuffered	Unbuffered	Unbuffered
Non-parity	Non-parity	Non-parity
200-pin	200-pin	204-pin
667 MHz DDR2 SDRAM	800 MHz DDR2 SDRAM	1066 MHz DDR3 SDRAM

DIMMs with any of the following features aren't supported:

Registers or buffers
PLLs
Error-correcting code (ECC)
Parity
Extended data out (EDO) RAM

Installing memory

The internal components of your iMac can get warm. If you've been using your iMac, wait 10 minutes after shutting it down to allow the internal components to cool.

After your iMac has cooled down, follow these steps:

Disconnect the power cable and all other cables from your computer.
Place a soft, clean towel or cloth on a desk or other flat surface to prevent the display from getting scratched.
Hold the sides of the computer and slowly place the computer face down on the towel or cloth.
Using a Phillips screwdriver, remove the RAM access door in the bottom of the computer:
Remove the access door and set it aside.
Untuck the tab in the memory compartment. If you're replacing a memory module, untuck the tab and pull it to eject any installed memory module:
Insert your new or replacement RAM SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown above.
After you've inserted it, press the DIMM up into the slot. There should be a slight click when the memory has been seated correctly.
Tuck the tabs above the memory DIMMs and reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cable and all other cables to the computer, then start up the computer.

For these 20-inch and 17-inch models

Ddr3 Memory For Macbook 2008

Get memory specifications for the following iMac models, then find out how to install memory in them:

iMac (20-inch, Late 2006)
iMac (17-inch, Late 2006 CD)
iMac (17-inch, Late 2006)
iMac (17-inch, Mid 2006)
iMac (20-inch, Early 2006)
iMac (17-inch, Early 2006)

Memory specifications

Ddr3 Memory For Mac Mini

Number of memory slots	2
Base memory	1 GB	Two 512 MB DIMMs; one in each of the memory slots	iMac (Late 2006)
	512 MB	One DDR2 SDRAM installed in the top slot	iMac (17-inch Late 2006 CD)
	512 MB	Two 256 MB DIMMs; one in each of the memory slots	iMac (Mid 2006)
	512 MB	One DDR2 SDRAM installed in the top slot	iMac (Early 2006)
Maximum memory	4 GB	2 GB SO-DIMM in each of the two slots*	iMac (Late 2006)
Maximum memory	2 GB	1 GB SO-DIMM in each of the two slots	iMac (17-inch Late 2006 CD) iMac (Early 2006)
Memory card specifications	Compatible: - Small outline dual inline memory module (DDR SO-DIMM) format - PC2-5300 - Non-parity - 200-pin - 667 MHz - DDR3 SDRAM		Not compatible: - Registers or buffers - PLLs - ECC - Parity - EDO RAM

For the best performance, fill both memory slots, installing an equal memory module in each slot.
*iMac (Late 2006) uses a maximum of 3 GB of RAM.

Installing memory in the bottom slot

The internal components of your iMac can get warm. If you've been using your iMac, wait 10 minutes after shutting it down to allow the internal components to cool.

After you've shut down your iMac and given it some time to cool down, follow these steps:

Disconnect the power cable and all other cables from your computer.
Place a soft, clean towel or cloth on a desk or other flat surface to prevent the display from getting scratched.
Hold the sides of the computer and slowly place the computer face down on the towel or cloth.
Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
Move the DIMM ejector clips to their fully open position:
Insert your RAM SO-DIMM into the bottom slot, keeping in mind the orientation of the keyed SO-DIMM:
After you've inserted it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this can damage the SDRAM DIMM. There should be a slight click when the memory has been seated correctly.
Close the ejector clips:
Reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cable and all other cables to the computer, then start up the computer.

Replacing memory in the top slot

After you've shut down your iMac and given it some time to cool down, follow these steps:

Disconnect the power cable and all other cables from your computer.
Place a soft, clean towel or cloth on a desk or other flat surface to prevent the display from getting scratched.
Hold the sides of the computer and slowly place the computer face down on the towel or cloth.
Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
Pull the two levers on each side of the memory compartment to eject the memory module that's already installed:
Remove the memory module from your iMac as shown below:
Insert your RAM SO-DIMM into the top slot, noting the orientation of the keyed SO-DIMM:
After you've inserted it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this can damage the SDRAM DIMM. There should be a slight click when the memory has been seated correctly.
Close the ejector clips:
Reinstall the memory access door:
Place the computer in its upright position. Reconnect the power cable and all other cables to the computer, then start up the computer.

If your iMac makes a tone after you've installed memory

iMac models introduced before 2017 may make a warning sound when you start up after installing or replacing memory:

One tone, repeating every five seconds, signals that no RAM is installed.
Three successive tones, then a five-second pause (repeating) signals that RAM doesn't pass a data integrity check.

If you hear these tones, confirm that the memory you've installed is compatible with your iMac and that it's been installed correctly by reseating the memory. If your iMac continues to make the tone, contact Apple Support.

Confirm that your iMac recognises its new memory

After you've installed memory, you should confirm that your iMac recognises the new RAM by choosing Apple () menu > About This Mac.

Ddr3 Memory For Mac

For detailed information about the memory installed in your iMac, click System Report. Then choose Memory under the Hardware section in the left-hand side of System Information.

Ddr3 Memory For Mac

If your computer doesn't recognise the memory or doesn't start up correctly, confirm that the RAM you've installed is compatible with your iMac and that it's been installed correctly by reseating the memory. If you continue to experience issues with the memory in your iMac, contact Apple Support.