The Go 6600 will be available in a regular version as well as an Ultra model. Clock speeds are at 375/300 MHz and 450/350 MHz, and the chips carry a 128 bit memory interface; the pixel fill rate of the basic version is rated at 3 billion pixels per second. This is some 50% better than the 6200.
Compared to the previous generation of the chip, the Go 5600FX, the 6600 achieves more than double the performance in 3DMark03 while maintaining the same maximum power level of 18 watts, according to Nvidia's specs. Notebook manufacturers were looking for keeping the power level in this range. In contrast, system builders were willing to accept steep increases in the desktop replacement segment in exchange for significant more performance: A 6600 Ultra version of the mobile graphics processor will consume 26.5 watts but deliver 7000 points in the benchmark, a 6800 Ultra will climb to 66.1 watts but achieve about 12,000 points.
There are several companies planning to offer notebooks with the Go 6600 chip, these include Toshiba, Asus, Medion, Clevo, Aopen and MSI.