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Discussion Starter · #1 ·
I just bought a used Mid 2011 iMac.

It's first ram bank is populated with two 4g ram sticks (when bought from Apple) with the second bank empty.

Two questions:
Can I populate bank two with two 2G ram sticks or does the ram in the second bank have to match the first bank, so I would have to put two 4G modules??

Second, could there be any compatibility problems if I put compatible but a different brand of ram in the second bank?

Thanks for any info.

Marc P.
 

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They do not have to match. I currently have 2x8 gig RAM sticks and 2x4gig RAM sticks in my 5K iMac. Similar to another 27" slim model iMac and have done so for other models as well.
 

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Check out this URL if you like for any details:
Macintosh iMac intel i5 and i7 Mid 2010 21.5" and 27" and Mid-2011 Thunderbolt/SandyBridge 21.5" and 27" (DDR-3 1333 MHz SODIMM) iMac11,2, iMac11,3, iMac12,1, iMac12,2, MC511LL/A, MC309LL/A, MC812LL/A, MC813LL/A, MC814LL/A, Z0JP, A1311, A1312 - Bank 1 must be populated first.
Four sockets, supports up to 32GB (4x8GB) on 27" i5 and 27" i7 machines only.

Note: 21.5" machines and all i3 based machines are limited to 16 GB (4 x 4 GB)
Canada RAM sells memory in Canada - Apple Macintosh iMac intel Core2Duo, CoreDuo 17", 20" and 24"


- Patrick
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If they're compatible with this computer, shouldn't the speed be the same ?

Even though they might be Mac model compatible, some faster rated RAM is often backward compatible but may also be cheaper than the original modules.

Just check with canadaram.com if in doubt as to which is better for your Mac model.


- Patrick
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If they're compatible with this computer, shouldn't the speed be the same ?
Not necessarily. You could for instance have a bank of DDR3 2400 (making up numbers here) and a bank of DDR3 1600. At that point, you've effectively reduced the former to 1600 as well. It'll work, but not as well as matched.
 

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At that point, you've effectively reduced the former to 1600 as well. It'll work, but not as well as matched.

Unless the Mac's memory BUS only worked at the 1600 speed and the 2400 module(s) were backward compatible, then there would probably be no noticeable difference to the user.

At least the Mid 2011 iMacs were memory upgradable unlike some later models!!!




- Patrick
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