Both an AMD64 3200+ and a P4 3.2ghz would provide excellent performance in n64 emulation, although I believe the AMD64 is the better choice (I recently had a change of heart on that). AMD64 3200+ has a slight edge in a lot of tasks except video encoding/decoding. Personally I have no regrets for my choice though
FPS with Perfect Dark with my system: btw, FPS in Project64 is equal to VIs in 1964 so don't take any notice of it, its not actually FPS, the framerate is equal to half. so mine would be about 63 with this screenshot, thats still twice as fast as what you get (20 fps).