Maybe this will ease your fear, guys.
My old system was :
Pentium 4, 2.0 Ghz, 512 MB Ram, GF4 TI 4200 (64 MB), W98SE
And I always played 1024x768x32, Glowmaps and tga-background enabled.
Besides some minor situations, where really big battles go on, I had around 40 FPS. It should even...