hey guys i have a old lga775 rig and used to run sli (2 X gts250's) with a core 2 duo 2.93, then i decided to upgrade by getting a quad core q9550, i installed the processor and now my sli is going crazy , any game i run flickers, changes colors, randomly pauses, but videos run fine. I tried various things to fix the problem but didn't help therefore i reinstalled windows and drivers but still gave me the exact same problem and i don't think its my power supply because i have a 550w 'extreme power'. I even checked my cards individually but both of them seem to be working fine Please can some one tell me whats wrong