Weak PSU ?

[thelastdrone]

Ok, so i got a Q-tec cheap http://www.qtec.info/products/product.htm?artnr=14513 PSU
and recently i put a 6800GS and im expiriencing preformance decrease while playing games.
Ive tried other PSU, resloting the card,drivers , chipset drivers ect.. and i still have this problem and i think is the psu but im not quite sure.
I probobly need new psu any suggestions ? thanx.
sry for my poor english.
Ah and a ultra power dropdown in 3dmark2006 lol

 

[jonnyGURU]

Well, Q-Tec generally isn't good. But if you tried two different power supplies, why do you think it's a power supply issue? Why wouldn't it just be a bad video card? You try the video card in another PC?

 

[thelastdrone]

Vidocard works ok when not pushed too hard but on clock 530/1300 after 1 3dmark run i t goes from 6500 mpixel/s and 6500 mtxel/s to 4000, can be oc problem though

just downlcoks automaticly wich brings the low preformance
not enough power to work so high ? its not a heat problem.