Naturally, the new Go 7900 GS and GTX are based on the same 90nm G71 GPU as the desktop 7900 cards. The GPU has been tweaked for even lower power consumption in this application: the Go 7900 GTX draws only 45W, a major step down from the Go 7800 GTX's 65W. As for the Go 7900 GS, it draws just 20W, which might allow it to fit into some thin-and-light notebooks.
The 7900 GS's low power consumption is no wonder, though, as its specifications are the lowest of any current G71-based offering. On the other hand, the Go 7900 GTX's numbers are actually above the desktop 7900 GT, with a 50MHz higher core clock and 80MHz higher memory clock. Considering how well the 7900 GT already performs, the Go 7900 GTX should pack some impressive punch for mobile gamers. It's available right now, as well. Dell is touting its new XPS M1710, which packs either a 7900 GS or 7900 GTX along with a Core Duo T2600 and a 17" 1900x1080 wide-screen display. NVIDIA also lists Gateway as a launch partner, although Gateway doesn't seem to be shipping any 7900-powered notebooks just yet. For those interested, PC Perspective has also put up a short preview of the new GPUs that shows some NVIDIA-produced benchmarks of the Go 7900 GTX beating ATI's Mobility X1800 XT.