I have an EVGA 780 OC with the reference cooler and when I run Unigine Valley I find a few artifacts. However every game I run I find no artifacting. This includes Watch Dogs, WoW, SC2, League, Dota, and more. Is there something wrong with my GPU or is Unigine Valley just not working properly. To add on to this, what should I limit my overclock to? The number of artifacts or until my drivers crash?