RAM > DDR4 PC21300 2666MHz

Welcome to the Mac Upgrades DDR4 2666MHz (PC4-21300) RAM page (note: 2666MHz RAM is sometimes described as 2667MHz - there is no difference). The SODIMM modules are used by Mac minis and 27" iMac models released between 2018 and 2020 inclusive (late model Intel machines). There are also DIMM modules for the iMac Pro 2017.

If you know the RAM you need, you can find it below. But it is important to choose the correct RAM for your Mac, and if you are unsure, our site is designed to make this process as simple as possible. We will have a detailed page on your exact Mac, which lists guaranteed compatible upgrades for it.

You can find your Mac's page by searching for your Mac in the box below. You can search by its serial number, or any other identifier (part number, EMC number, model identifier, etc.) or just by searching by keywords (eg: iMac 2020 3.1GHz). This will take you to a page where you can select your exact Mac (or straight to it, if your search is precise enough). This page will have RAM that we guarantee to be correct and compatible for your exact model.


Search for any Mac model. You can search by name and date, as well as any of various identifiers such as: serial number (Macs made before 2021), part number, model identifier, model number and EMC number.

To search for a serial number, enter the serial number on its own. Other identifiers and keywords can be combined.

You can also search for a macOS version to see all Macs compatible with it.

Once you have found your Mac, you will find detailed specs for it and see fully compatible products, repairs, and upgrades for your exact machine.

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 OWC      OWC DDR4 PC21300 2666MHz LRDIMM 128GB iMac Pro Kit (2 x 64GB) *** Special Order Item, dispatch estimate: 15 working days  £894.24 
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 OWC      OWC DDR4 PC21300 2666MHz RDIMM 128GB iMac Pro Kit (4 x 32GB) *** Special Order Item, dispatch estimate: 15 working days  £698.46 
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 OWC      OWC DDR4 PC21300 2666MHz RDIMM 64GB iMac Pro Kit (4 x 16GB) *** Special Order Item, dispatch estimate: 15 working days  £369.56 
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 OWC      OWC DDR4 PC21300 2666MHz SODIMM - 128GB Kit (4 x 32GB) *** Dispatch estimate: 5 working days  £569.90 
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 OWC      OWC DDR4 PC21300 2666MHz SODIMM - 16GB - In Stock  £75.90 
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 OWC      OWC DDR4 PC21300 2666MHz SODIMM - 16GB Kit (2 x 8GB) - In Stock  £76.32 
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 OWC      OWC DDR4 PC21300 2666MHz SODIMM - 32GB - In Stock  £149.88 
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 OWC      OWC DDR4 PC21300 2666MHz SODIMM - 32GB Kit (2 x 16GB) - In Stock  £149.50 
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 OWC      OWC DDR4 PC21300 2666MHz SODIMM - 64GB Kit (2 x 32GB) - In Stock  £287.77 
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 OWC      OWC DDR4 PC21300 2666MHz SODIMM - 8GB - In Stock  £43.80 
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 MacUpgrades      Refurb DDR4 PC21300 2666MHz SODIMM 8GB Kit - (2 x 4GB) - In Stock  £30.00 
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Displaying 1 to 11 (of 11 products) Result Pages:  1