I played the Demo with my Athlon 800 Thunderbird (probably first breed), and it ran fine - at least in 800x600. I had no problems with that configuration, but higher resolutions were not so good.

When you find a big kettle of crazy, it's best not to stir it.
--Dilbert cartoon

"Interplay.some zombiefied unlife thing going on there" - skavenhorde at RPGWatch