Freezing with Colored Vertical lines

Hey all, tricky issue here, i just got a new build and when playing games my computer will randomly freeze and also begin displaying solid colored screens with vertical lines on it.. i can still hear audio sometimes, but i happens ranging from minutes after the game loads to hours after the game loads.

i thought it was an issue with my card overheating, but i hear and feel the fan on the card spinning, then i thought it was the processor and i remember on my last pc i had to ... clock... it or something like that in the bios at one point because it didnt automatically do it for me when i built.. forgot the term it was a friend helped me... any help would be great, ive updated drivers.. not sure what to do next..

processor - i7 860 @ 2.8 GHz
card - 2x HD 5770 Radeon
mobo - evga p55 ftw
HD - not sure ( its older, worked fine before, maybe a memory issue, displacing new memory or whatnot..)
Ram - 6 GB DDR3

thanks again :) keeps requiring hard reset when this happens, no alt4 or anything like that

any opinions?

I can get one, I was hopin that wasn't the case, I'll try speedfan

is there a way to adjust the speed of the cards fan? Bios or somethin