I got Athlon 650 classic, Gforce 2mx 32Meg, 256 Meg RAM, win98SE, directx 8.0a, Monster sound II.
I run AH at 1024*768 * 32bit, i normally get between 35-50, and down to 20 or so in hvy smoke.
Ram: first get the VIA 4in1 drivers(only if you have VIA chipset), they make a huge difference. Get the latest detonator 21.something drivers. And start overclocking stuff, if your still not happy.