I've got a Prophet GeForce 2 GTS 64Megs, 256 RAM and Athlon 800MHz, and from what I've heard, the card is important, but even more important is the CPU... I get a much lower framerate than a guy that has an Athlon 1GHz and a GeForce 2 MX at 1600x1200 (this is the resolution I always use).
My FR is always around the 40s, dropping to 10-20 when near fleet ack or smoke, with no FSAA, Vsync disabled, and the latest drivers.
Daniel, aka Cyrano