Are you looking for an NVIDIA GeForce 7900 GT card that you can overclock by 31%? If so, you might be interested in the XFX GeForce 7900 GT Extreme Edition. Factory-overclocked to 520MHz core and 870MHz memory, Tech ARP actually managed to overclock it a lot further:

The XFX GeForce 7900 GT Extreme Edition performed really well in our tests. In most of the game benchmarks, this card managed to beat the NVIDIA GeForce 7800 GT card by 20-30% at stock speeds. This improved to about 40-60% when the card was further overclocked!

The card itself is really nothing special. It followed the NVIDIA reference design, albeit factory-overclocked to 520MHz core and 750MHz memory. XFX even used the same cooler, even though both core and memory were overclocked.

The included bundle was bare, with games included as part of the package. The two DVI-to-VGA adaptors are the only consolation. But the card certainly made up for it with its raw performance and phenomenal overclockability!

We have no idea if this is the norm or the exception but our card was highly overclockable. We managed to push this card to 590MHz core and 870MHz memory. That's a cool boost of 140MHz (31%) in GPU speed and 210MHz (31.2%) in memory speed!