2900pro performing poor

Sounds unstable for sure, something aint right.

PSU... maybe if it's a generic brand and it's rated at peak output. Depends what it's putting out on the 12v rail. What model of PSU is it exactly?

hmm, so you spend all that dosh on a quality PC then buy a godawful PSU. IMO a rule of thumb is to spend 10% of you total system budget on a psu excluding peripherals.

Unfortunately not

http://www.buy.com/prod/corsair-vx [...] 66485.html

I was at COMPusa yesterday and they now stock Corsair HX520 and the HX620 as well as some other named brand PSU's . Might try that

Couldn't this be a driver problem?
Have you uninstalled and cleened out the old nvidia drivers?

try it at 20 % lower clocks (use ccc or atitool) for gpu and cpu (bios settings )so it needs a lot less power and disconnect everything you don't use (cdrom, second hd etc.)

if it's more fluid and stable it's probably your psu failing or your temps to high.....

I have purchased myself a new PSU, which should be more than capable. The new PSU has not solved anything and I am still experiencing stutter. I have tried re-installing the ATI drivers, but this does not help. My games are running like crap and I am out of ideas

i would use driver cleaner if i were you, and reinstall the ati-drivers, check your temps, make sure that there is now power cabling near your computer that gives off alot of EMI, you'd be suprised at what that can do to your performance do NOT doubt that. It has happend to me twice now in my life.

If the new PSU doesnt work,
and none of these work.
Then call tech support, and inform them of this, you cannot doubt the possibility of a bad card.

As someone said, downclock the card a little, maybe its a worse chip then ATI thought and sint even capable of these speeds.

As you probably already know >=( I have virtually the same PSU, 50 watts more, works FINE! IT WORKS PHINE!

I'd test it with Windows XP, but the card might just be broken. If it's still under warranty you could RMA it.

I am gonna say RMA while you can.....also if you bought it locally you can straight exchange it

Cat AI is optimizations and well you should be ok with standard...

An issue I tell people who buy ATi cards is this: The thermal paste use don the cards soemtimes doesn't melt and allow proper cooling for about a week. I would check those temps, note what they are, and see what others are getting.

And don't regret your purchase of the HD2900 PRo over an 8800GTs. for all you know, the 8800GTS could be having the same problems and you might be saying you'd regret purchasing that instead of the HD2900 PRO. In the grand scheme of things though, it did force you to buy a new PSU, which may sound bad, but hey, at least you won't have to upgrade later on for quite some time. Try to stay optimistic.