you can run a program like 'everest' to see what hardware you have. Though you sound quite pc fancy, installing fans etc yourself, i'd guess you know what's in your pc.

Anyhow. The reason I asked was, some suppliers give out factory oc'd graphics cards. I personally run 2x xfx 260+ black edition. These cards are overclocked from 576 mhz to 666 by XFX. You'de think this makes it fine and properly tested. Well, I had to underclock them back to standard to not crash. Crashes would appear prety random as well