yes, it is for games and it is more compliated than I thought.
The classic stereo 162.50 drivers are not good wit quadros under XP. The Quadro diver has an own stereo support: viewtopic.php?f=5&t=3407
It looks like with the right quadro card, you can use legally 3d Vison und XP!!!
I also have a NVS 295 quadro.
Probabaly Quadro is good for Open GL gaming?
I will update my findings