GPUs dont overclock very far, not anything that would show a major difference. The 7300GT does not exist, 7300GS or 7600GT. The 7600GT is good, but the 7300GS certainly isn't. Abit cards are still ATis, but Sapphires are known to be some of the best cards out there. You're comparing to the X600 Pro? The X1600Pro is quite a bit faster, the 7300GS is just a little faster and the 7600GT much faster.