The only people I can see adding the Physx card are those with slow S478 or S462 cpus with decent graphics cards that don't want to upgrade their mobos. Personally I'd say drop the money into a new rig with a dual core cpu, but a lot of people run older PCs that don't want to have to buy a new graphics card, mobo, ram, cpu, and probably a PSU just to play UT3. I have a friend that plans to play this game with an AthlonXP 3200+ and a 9800 Pro. I keep telling him to buy a cheap AM2 or C2D mobo, but he refuses. He doesn't want to buy all the parts that go along with that upgrade. Maybe his XP 3200+ Unreal dreams can come true with Physx @ 800x600.