I bet that Radeon would do fine at that FSB. Pretty much all of the modern cards are good at high FSB. And the reports bare this out.
This is adressed to the AMD spoilers jumping on this thread. I too thought about this. But the right choice is the P3. It comes out to the same money. But there are too many variables with changing platforms and getting basically the same performance in return. For one most are still using the BX platform. This is still the most stable and a very fast mobo still. Also the Athlon platform is very finicky about RAM, and power supplies, etc. Who knows if the Athlon will run stable as a direct replacement, or even run at all, with your current rig. Plus there are more heat concerns as well because the Athlon's run much hotter.
Why change a good stable system you already own, to another your not sure will run? Especialy when there really is no pay off to do so. Also there is more work involved in swaping out the motherboard. Beyond the physical work of doing it, you'll have to reformat and reinstall the OS, apps, everything, etc.. A big pain in the @ss!
With the processor upgrade you just put it in and there it is. It posts and then no more fussing with it. You don't even have to change anyhthing in windows, let alone backup your stuff and reformat.
So to recap, the processor upgrade is the way to go. Now if one was to pick out a whole new system from scratch then the AMD argument is very hard to resist. But for the people reading this thread, they are in the situation I'm describing. So think a little before you post. Oh...and shut the hell up.