So here it is, I already decided to buy a new PSU which is "Corsair HX 650W PSU, 80 PLUS® Gold" instead of my 360W one, on Dell Studio XPS 435MT. But wondering what GPU should I go with, 1x "MSI GeForce GTX 680 4GB PhysX CUDA" or 2x "MSI GeForce GTX 660Ti 2GB PhysX CUDA". I know that not all of the games use the 2x GPU advantage, so it would be a bit shame to have 2x. While 1x gtx 680 would fit better for any game. Games that I consider running on highest graphic are: Saints Row 3, Skyrim, Guild Wars 2 and upcoming ones. By the way my CPU is "Intel Core i7 CPU 920 @ 267GHz (8CPUs), ~2.7GHz". So any suggestions with which one should I go? 1x 680 or 2x 660ti? Thank you!