Hi Guys, I got a late 2012 27" iMac with stock 8gb ram, i did some googli & found out by the manufacturer code(0x02FE) that my stock ram is from Elpida. I think they are 1.5v like the other 2012 iMacs. I was thinking of putting the corsair vengeance 16gb upgrade package & leaving the stock ones as spares. Anyone tried & are happy with the vengeance series? any performance difference specially in gaming will the iMac run fine with only the vengeance ram? inputs would be great. Thanks..