Also running the memory slower means you can set the timings lower. Im running memory rated for 2.5,3,3,6 at 200mhz but actually i can run it at 2,3,3,6 without problems and at 194mhz i can run it at 2,2,2,6 but then you lose the advantage of higher speed memory somewhat...
2100xp @ 2300mhz (200x11.5 @ 1.9v)
Epox 8RDA3+ Nforce 2 ultra 400
2x512mb pc3200
ATI 9700 pro
3DMARK 2K1 = 16,000