Well, for those with fast CPU's and older cards, might be worth having a look at

http://unreal.epicgames.com/

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Alright, I gave it a quick run...
Well, the results obviously aren't visual highlights, but for Software Renderer, having to draw such extremely Detailled scenes, it doesn't work that bad. Still an early release as well, so maybe they still improve it

Screenies (Software Renderer) :
-- update -- had to apply post Gamma Correction, as they were too dark otherwise








And now comparison to Hardware (note that alot of the high image definition got lost in the .jpg transformation )