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Member Since: Nov 02, 2012
Posts: 377
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Mac Specs: iMac 21.5" 2.5 i5 8G RAM OS X 10.10.3 (12C60)

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I want to add 4 GB of RAM memory to my iMac mid-2011 i5 21.5".

What's the difference between these two? (Results from Corsair's memory finder tool.)

Corsair Mac Memory — 4GB DDR3 SODIMM Memory Kit (CMSA4GX3M1A1333C9) single stick

Corsair Mac Memory — 4GB Dual Channel DDR3 SODIMM Memory Kit (CMSA4GX3M1A1066C7) single stick

Difference I see is 9-9-9-2-4 or 7-7-7-2-0 between the two, repectively; what do these figures mean?

Also, is there any advantage to having 1 stick of 4 GB vs. 2 sticks of 2 GBs?
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