I run at about 65-75 FPS 75% of the time in AHII. When I get into a furball, I drop to about 35-50 FPS, with only a minor freeze-up here and there.
Home built:
Kryotech Renegade cpu cooling (refrigeration)
Abit KD7-raid VT400
AMD 2500 athlon XP Barton
ATI radeon 9600 pro 128M (STILL the best you can get for the money)
1 gig (2x 512) of Geil ddr400 (running at ddr333)
2x WD 80gig 7200rpm 8meg cash HDs running in Striping mode
420W PS
DSL 320 upload 240 Download
Linksys BEFSR41
Memorex dual format DVD burner
Light-on DVD ROM
Saitek X45 HOTAS
Win XP Pro SP1