This "XXX" card is OC'd right out of the box by 55MHz on the core (~9%) and 200Mhz on the memory (>10%).

"The XFX GeFORCE 8800 GTX XXX power consumption is the highest of any Nvidia card I've seen -- it even overcomes ATI's notorious video card power consumption. The BFG GeFORCE 8800 GTS runs with significantly less power so make sure you have a efficient power supply if you plan on getting a XXX (or three). NVIDIA's minimum requirements state a 450W PSU for a single 8800 GTX but right on the box XFX recommends at least a 625W for a single XXX and 800W or greater (!) for SLI GTX XXX cards."



Link: Neoseeker