I play Battlefield 3, Black Ops 2, Planet Side, Crysis 3, and a couple others. I currently have an ASUS GTX 770 OC, but I was considering running 2 EVGA 660ti SC in SLI. I run 1 23in ASUS 1080p monitor with 2 ms response time for gaming. I can upgrade PSU if I run in SLI. Current PSU is a Corsair CX 600M which I know is nowhere near enough to run SLI, was thinking 850W or higher for that. How can I get better performance, speed, frame rates...etc? Any recommendations for 2 cards in SLI for around $600.00? Thank you ahead of time!