those PerformanceTest ratings are from my GeForce 2 card. I haven't ran any for my GeForce 4.
Oh, I didn't realize they were making limited numbers of GeForce FX's. Oh well, I can still get a good GF4 Ti 4200 128MB for about $150.
I know the difference between an 4x and 8x might be small, but it's only a few dollars more. If it ends up being too much I can just get the 4x.