and if u download "artifact tester" that will stress you video card and tell you if it detected any artifacts,,those things that occur when the card overheats... If it doesnt detect any, then you didnt overclock enough

p.s. i have the 8890 too and i dont bother... but you're free to do what you wish because more than enough others have done it.. I tried it a while back with powerstrip, but i like to keep my laptop cool, not quality driven. In hindsight, i am not a laptop kinda guy and never should have gotten one...