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Don't buy that, it's 1066MHz and iMac uses 1333MHz now so it would underclock the existing RAM to run at 1066MHz. This should work
 
excellent. and where can i find a 16GB link just to scope the price? (sorry I'm spectarded. It all looks like chinese to me but I trust all you)
 
excellent. and where can i find a 16GB link just to scope the price? (sorry I'm spectarded. It all looks like chinese to me but I trust all you)

If you want 16GB, just buy two of those kits as that would be 4x4GB = 16GB. Call NewEgg before ordering and ask does it work with Macs as that's not Mac RAM (there is no difference really but just make sure because I don't want to advice you to buy wrong RAM)
 
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