because Pegasos/A1 don't have the power to play a "modern" 3D shooter
Just a thought. On my AMD 900 with a paltry 128mb and an ATI 9000 PRo 64mb, I can run the follwing, without any slowdown, quite well:
MOHAA (including Spearhead)
Battlefield 1942
Hitman 2
Jedi Outcast
But I guess your talking about the next generation of 3d shooters like Doom III :-) .
Cheers