Agreed that it could be a heat issue. Try improving your airflow before spending $300+ for a video card you may not need.
Just a hunch, but what kind of power supply do you have? When upgrading the power supply in the past, I got some performance boost for some reason.
thank you guys i haven't logged on o the forums like last year
but u were right heat issues i ending up getting one more GTX 260 in SLI for around $100 AUD then acouple on months l8er i had a lot of extar cash from part time job at Coles and bought myself the following
SuperFlower 700 WATT 80+ gold
Coolit Vantage Push pull (added a spare fan)
and the rest is as follows
i7 920 at 4.11GHz 21x196
Kingston RAM 1333MHz 6GB
Two Segate 500 gb HDD in RAID 0
two DVD drives (one by HP the other Benq)
Windows 7 ultimate X64 Build 7600
MX 5500 Logitech
Microsoft Sidewinder X8
Logitech X530 5.1 channel Surround
i and now am looking for some one who wants it for around 2000 AUD the whole thing includes everything