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I've added this pair of memory modules to my iMac 27-inc, Mid 2011, to upgrade from 4 GB to 20 GB of total RAM. Despite the Apple documentation claiming that 16 is the maximum capacity for this model, I researched and found that you can max out to up to 32 GB. For those people that have no clue (like me), the installation was really easy: 1 - Turn off your iMac. Touch the iMac frame to discharge you (electrostatic), and unplug it from A.C. Place your iMac "face down" in a towel. 2 - unscrew the 3 bolts from the memory bay at the bottom of the iMac, remove the memory cover. 3 - leave the 2 RAM modules in their slots (I had 2 RAM modules, of 2 GB each). 4 - Insert the NEW 2 RAM modules (8 GB each) in the 2 available slots. 5 - Screw the 3 memory cover bolts, get it up back in place and turn it on. That's it. By looking at the "About this Mac > Memory" screen, I went from: [ 2 GB ] [ 2 GB ] [ ] [ ] To: [ 2 GB ] [ 2 GB ] [ 8 GB ] [ 8 GB ] Hope this helps!