With Nvdia, teh numbering works as follows:
8800gt means it's an 8 series card and it's the 800 model in that series. For the last 4 series of nvidia card, 600 has been midrange gamer and 800 has been high end gamer, then sometimes they release a 900 model which is top of the line before you have to go to the next series up The letter i.e. GT refer to the speed of that model, normally memeory bandwidth speed. So a 8800 can be faster than a 9600 as it's the top model in the 8 series where as the 9600 is the midrange model in the 9 series. The 9600 probably supports a few more directx10.1 features though.
8800gt means it's an 8 series card and it's the 800 model in that series. For the last 4 series of nvidia card, 600 has been midrange gamer and 800 has been high end gamer, then sometimes they release a 900 model which is top of the line before you have to go to the next series up The letter i.e. GT refer to the speed of that model, normally memeory bandwidth speed. So a 8800 can be faster than a 9600 as it's the top model in the 8 series where as the 9600 is the midrange model in the 9 series. The 9600 probably supports a few more directx10.1 features though.