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Cheers! Which RAM will be better for my iMac 27" mid 2010 with i7 2.93GHz and MacOS 10.9.5:

this, this or ADATA DDR3 SO-DIMM 8GB 1333? Also I have saw Kignston KVR1333D3S9/8G but according to it data-sheet it works with 677MHz instead of 1333MHz (as I understood my iMac supports up to 32GB 1333 MHz PC3-10600 DDR3 SO-DIMMs with 204-pin). Which one is better?

Actually I want to get 20GB of RAM - 8GBx2 new plates + 2GBx2 of stock memory.

closed as primarily opinion-based by grg, Tetsujin, jherran, Matthieu Riegler, Ruskes Feb 2 '15 at 3:42

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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Anything that matches the required spec should work. I've used Corsair and Kingston RAM without issue, and branding seems to be a somewhat personal preference. Most of the time, I get my Mac RAM here though and have never had issue.

Your aspiration for 20GB will be fine in your poroposed config.

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As said in the post before your config should work since it meets the specifications. One additional note: In order to leverage the dual channel capabilities of your RAM modules ensure that each pair is in a pair slot.

Different sized RAM pairs cant run in dual channel as far as I know.

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