yes, i've been doing research on overclocking my CPU. I heard of software that lets you overclock directly from your desktop if you have a pre-built computer with locked settings. I'm going to be doing more research on that. The other option is to upgrade my other computer, which is a Intel 2.4GHz P4. Would it still bottleneck on that computer?
Well, the reason I wanted 7900GS is because i heard it overclocks really well. The 2900GT costs $60 more than the 7900GS, which is like 50% more the price. Unless it really has 50% more the performance, I'm going to stick with the 7900GS. I don't really care about getting DX10; there aren't really that many extra features compared to DX9.