Did some quick tests

PhysX OFF

Physx ON

Stock clocks 8800GT, the games runs ok with Physx on, hope more games are supported

STaRGaZeR, in order to UT3 physx work through GPU, users have to substitute the physxcore.dll file from UT3 binaries directory with a similar one from v2.7.3 directory of Ageia Technolgies.

Do you know what file we should replace in order to have PhysX Hardware acceleration in Cellfactor? I'll install the game right now.