Facing problem with my new 295GTX

[alarmush]

hello Gamers !

i've just baught a new graphic card of 295GTX.. i waited so long to buy this card till i made the money for it.. and now.. i'm just facing a problem which is not clear to me what is its reason.. so if anyone can help i'll be thankful.

Alright, the only games i play on my p.c are mainly call of duty 4 (cod4) and call of duty 2 (cod2), but now after playing 30mins or more a bit sometimes at cod4 the picture starts to flicker, which never happened to me before while using my old 9800GTX.


here is my p.c info : Processor : i7 920 2.67GHz
Memory : 6GB (3X2GB) DDR3 1600MHz
Power Supply : 750W Thearmaltake ToughPower
H.D.D : W.D 150GB 10K raptor + another W.D 1.5TB

p.s : when i've went back to the place i've baught the card from they've ran it at 3DMark caliming that this is their test for graphic card and they said it passed the test fine, using 750W power supply like i got in my p.c but they didnt try it to the same games i want.

anyway.. if anyone have any try or any suggestion i'd love to hear ya dudes.

thx !