heh, I have P200MMX, 64mb, and a voodoo1 card. It loaded, the engine only rendered the characters and not the environment (it was all black with a couple soldiers here and there). When I moved it was very choppy (1FPS, yes 1FPS)
Actually the serious sam demo ran pretty well (err, to my standards, lol), rendered everything (lowest detail of course).
I finally have a cable connection to download all the newest demos and now my computer is crap, great 🙁