Originally Posted by SH64
I dont wanna jump to conclusions but if underclocking didnt help then it sounds a faulty card ..
how about reverting back to the older driver ?
Just did just that, first removed physx driver which made no difference then rolled back to to 177.35 and the artifacts are gone. So luckily it looks like a driver issue, or dodgy driver install maybe as nobody else has reported problems.
lets see how long unitil the next issue pop up.