Ok, my first video card was 8500gt and when I play L4D2 on max settings it crashes. I bought a 9400gt and it worked fine, no crashes even on mex settings. Lately, I bought a gt 430 1gb, and when I tried to play L4D2 on max settings, it crahes again. But when I play other games like Crysis 2, L4D1, Deus Ex: HR, Assassins Creed 2, there were no crashes. What do you think is the problem?