I have an Asus A8N-SLi with a 7800GTX and 1GB Corsair XMS PC3200.
The CPU is an Athlon 4000+.
In Battlefield 2, in 1280x1024 with 8x AA and Ultra High detail, I can average 80-90 FPS, some frames drop to around 50-60, sometimes they go around 100-110.
I think that's pretty damn good going.