I just ordered a 256m 7800Gt ive been an amd fanboi for a long long time so I havent folowed much about Nvidia at all..

Whats the difference between the gt and the gtx..why does the gtx clock so much better mine has 20 pipes isnt the gtx 24?
Im total noob at nvidia..
sry if this is thread crapping I just would like advice from u guys since u seem to know a helluva lot more about nvidia than I do..