iMac memory limit

131

Solution 1

No.

The iMac 7,1 (20 and 24 inch models) support a maximum of 4GB

Solution 2

According to OWC, your iMac 7,1 can take up to 6GB (2+4GB).

Solution 3

I have an iMac 7.1 running snow leopard. I have hyperX Kensington memory installed & I have 2 x 4GB sodimms in and the iMac reads 8GB matched ram installed :-) they said it shouldn't work but it does for me...

Solution 4

When I have questions about the specification or capabilities of a Mac the first place I usually look is www.everymac.com. (FWIW, the site is sponsored by OWC which was mentioned in another answer to this question.)

I believe your iMac should be one of the ones listed below. All of them have this note:
Apple officially supports 4 GB of RAM, but third-parties have been able to upgrade the system to 6 GB of RAM using one 2 GB and one 4 GB memory module.

Apple iMac "Core 2 Duo" 2.0 20-Inch (Al) Specs

Apple iMac "Core 2 Duo" 2.4 20-Inch (Al) Specs

Apple iMac "Core 2 Duo" 2.4 24-Inch (Al) Specs

BTW, there really is no difference between Snow Leopard & Leopard in terms of how much physical memory can be (usefully) installed into a Mac. What matters is the hardware, the memory controller used, not the operating system.

Yes, in theory, Snow Leopard on some Macs allows the kernel to use more than 4GiB of RAM. In practice, most Macs will still use the 32-bit kernel and so have the same kernel address limits as Leopard. (IMO, Snow Leopard is still "better" though for other reasons.)

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Updated on September 17, 2022

Comments

  • Simon Osbon
    Simon Osbon over 1 year

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  • micmcg
    micmcg almost 14 years
    Why is this down voted, its true. I've got an iMac 8,1 and the restriction is the same, it only supports a maximum of 4GB.
  • ghoppe
    ghoppe over 13 years
    @micmcg I think it may have been downvoted because although they "officially" support only 4GB, if you put in 2x4GB modules the system will be able to access 6GB of that total. See everymac.com/systems/apple/imac/imac-aluminum-faq/…