I would say its driver related. Run memtest just in case and check your gfx temps using everest. If its getting hot in game then this could be the cause. Fit a zalmon Fata1ty to it anyway
What cooler you got on the cpu also? what temps this reaching. HAve you over clocked at all?
Who is Vitesta? am I being a noob by not knowing them or are they a generic brand?
A quick google tells me it should be good
