Pc freezes with random vertical lines

[panparade]

I recently built this new pc and it freezes when i run firefox(in 5-10 mins) or some other browser(1-2 hours) or when im playing warcraft 3.

proc: core i5-2500k
ram: corsair vengeance 1600mhz 8gb (4x2)
gfx: xfx radeon 6790
mobo: asus p8z68-v pro
psu: antec 850W

First it used to run vpu recover and stop my pc again and again, then i replaced my gfx card and now it freezes on the applications i mentioned with vertical colorful striped lines(screen goes yellow on firefox and striped lines on others). Is this a video card problem or can this be related to ram?

it only stops on these applications, i've played heavy games such as witcher 2 and starcraft 2 for hours, never froze on them.

 

[hell_storm2004]

Those are artifacts. Looks like you got a faulty card! RMA it quick!

EDIT: One question... are you on the latest drivers?

 

[panparade]

yes im on the latest drivers, and as i mentioned i already RMA'd once, so is it a faulty card again or can this be related to ram?

 

[hell_storm2004]

Dont think so.... But you can run MemTest86+ for more than 2 passes to check if there is a problem.

 

[panparade]

memtest ran fine, i already checked that
i guess i'll just get the card replaced, again

 

[hell_storm2004]

Its hard luck when the replacement card comes in bad as well! But it happens!