XFX NVIDIA 8800 GTX XXX Graphics Card
 

"Today we will just look at the performance improvements and compare the 8800 GTX XXX performance to the performance of the stock 8800 GTX. The only place that the 8800 GTX XXX differs from the stock 8800 GTX is in the clock speeds. The stock 8800 GTX is clocked at 575 MHz on the core and 1.8 GHz on the memory whereas the XXX version is clocked at 630 MHz on the core and 2GHz on the memory. "

http://www.i4u.com/section-viewarticle-165.html