Celeron 1.93 GHz, 1.5 GB RAM, ATI Radeon 9250, Windows XP Home - works, laggy at dense places but not too hard, just the rendering is unusable (polygons are overbright, hair always white, heightfield maps are pitch black).
Duron 800 MHz, 512 MB RAM, GeForce2 GTS (32 MB), Windows 2000 SP4 - takes extremely long to load but works with low settings, same wrong rendering (polygons are overbright or pitch black, hair white when polygons are bright or shaded when black, heightfields are pitch black; the Gugrontid passage shows some colorful lighting fluctuations); apart from that, rendering speed is fine!