RAM > DDR2 PC5300 667MHz

Welcome to the Mac Upgrades DDR3 667MHz (PC2-5300) RAM page. This speed of RAM was used by original Intel Macs released in 2006 and 2007. It can generally be substituted for 800MHz PC2-6400 RAM in slightly later Macs (which is almost unobtainable) though it will slightly slow the machines down.

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 8GB (2 x 4GB) Kit 667MHz FB-DIMM for Mac Pro *** Special Order Item, dispatch estimate: 10 working days  £102.24 
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 OWC      OWC DDR2 PC5300 SODIMM - 2GB *** Dispatch estimate: 5 working days  £14.64 
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 OWC      OWC DDR2 PC5300 SODIMM - 4GB (1 x 4GB) *** Dispatch estimate: 5 working days  £75.18 
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 OWC      OWC DDR2 PC5300 SODIMM - 6GB Kit (4GB + 2GB) *** Dispatch estimate: 5 working days  £86.52 
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