If it's a software issue, your only chance is either updating your drivers, or rolling back your drivers.  However, artifacts are usually caused by a hardware issue, typically when the card is overheating.  Is the card being properly cooled?  My card sometimes does this in video games, and then it refuses to turn back on the next day for a while, or it'll shut itself off and stop working.  It only happens in 75+ degree Fahrenheit weather tho