Just bought new system from overclockers. The Ultima OC 8800GTS SLI system. Runs fine except when running games. Will run games for various amounts of time(5 - 20 mins) then screen goes blank and display drivers have to be retrieved. Got latest drivers. Ran 3dmark06, got all the way through test, both single and SLI. (13000+ and 15000+ results). Is there something simple I can do or will I have to contact Overclockers?.