My HW is :
900Mhz AMD Thunderbird
384MB RAM
ATI Radeon 7200
Unfortunately the fps under linux is pretty slow -- 10-15fps, while I'm getting 20-30 under windows. The problem is that ATI does not make linux drivers for this card.
If you have an NVidia card, you should see fps comparable to windows, or higher under linux.
Would be nice to hear what people with nvidia cards get...