Nvidia's NV43 is Geforce 6600
 

The NV43 will be known as the Geforce 6600 from now on. There will be two versions - a 6600 standard and a 6600GT with a huge difference in clock speed. <> 6600 standard will be clocked at 300MHz+ and will use DDR/DDR2 memory while the 6600GT will be clocked close to 500MHz core and will use almost that fast memory, GDDR3.

http://www.theinquirer.net/?article=17706