OK, so I found a great deal and am buying a white iMac. Its a C2D 17" and comes with 2GB RAM. Needless to say, I want more RAM. This model supports 4GB but only utilizes 3.XGB. Here's my question; which should I buy? (Both are 667MHz DDR2 and from Newegg, and I like both brands ) 4GB Corsair ValueSelect (2x2GB) with 5-5-5-15 timings for $37.99 -OR- 3GB Kingston HyperX (2+1GB) with 4-4-4-12 timings for $36.99. Basically my question is which will perform better a slower matched pair or a faster unmatched? Thanks for the advice! EDIT: The iMac has the Radeon X1600 video card, NOT the integrated Intel.