Hi guys. I have overclocked my Gtx 280 from
602 1296 1107 core shader memory to
715 1430 1300

That overclock works fine, no artifacts in ati tool at lowest artifact find.
But, when i raise the fan speed to 70% the screen becomes all yellow and stuff. Sounds like voltage problems or something but i'm not so good at overclocking. So what could it be?