Sorry DevilsAdvocate but ALL of the benchmarks I've seen show that the o/b GF2 is actually at (actually just below) that of a GF2MX200. For $60 GF2TI or GTS is a much better buy if you have any gaming ambition what-so-ever. You do get the best perf from the nForce o/b gfx if your nForce has dual RAM ability like 420 IIRC, but even then no where near GF2MX400. The perf is comparible to other current o/b gfx though.
However GF3TI200 is great value for $82, and in the US & Canada the Radeon8500LE is even better at $93 (better image quality and VIVO, plus slightly better perf, even when o/c). The GF4TI4200 is the only other card the vast majority of us can consider and is excellent value at $138.
Here's a guide to the perf differences quoting: marks, game1HIGH FPS, game2HIGH FPS, game3HIGH FPS, NatureDX8 FPS.
3Dmark2001 1024x768x32 AthlonXP1600+:
GF2MX200: 1500, 15, 14, 13, n/a
GF2TI/GTS: 5000, 36, 40, 43, n/a
GF3TI200: 7500, 45, 63, 57, 39
GF4TI4200: 8500, 41, 98, 50, 37
Rad8500: 8000, 43, 77, 52, 46
3Dmark2001 1024x768x32xAA AthlonXP1600+:
GF2MX200: 550, 6, 5, 6, n/a
(Athlon 1.5ghz only submitted result)
GF2TI/GTS: 2200, 21, 21, 21, n/a
GF3TI200: 4000, 23, 36, 34, 19
GF4TI4200: 6500, 38, 66, 43, 27
Rad8500: 5000, 38, 43, 39, 23