GeForce GTX+ and GTX 200 owners please install the ForceWare 177.39 driver which includes the NVIDIA PhysX System driver 8.06.12.
GeForce ForceWare 177.39 XP (64-bit)
GeForce ForceWare 177.39 XP (32-bit)
GeForce ForceWare 177.39 Vista (32-bit)
GeForce ForceWare 177.39 Vista (64-bit)
Ageia | NVIDIA PhysX System driver 8.06.12
FEATURES:
SYSTEM REQUIREMENTS
OS: Microsoft Windows XP SP2 or Windows Vista
CPU: 2.13 GHz Intel Core 2 Duo, AMD Athlon FX-60 or higher
System RAM: 1 GB or higher
Graphics Card: NVIDIA GeForce 8-series or higher
Physics: AGEIA PhysX Accelerator or GeForce PhysX-enable GPU (v177.39 driver or later)
Free Hard Disk Space: 1 GB
The Extreme Physics mod pack requires a full version of Unreal Tournament 3 - It is not a stand-alone title. Make sure to enable "Hardware Physics" under Video Settings in the UT3 settings.
* The Extreme Physics Mod requires hardware-accelerated physics to run at a sustainable playable frame rate on most systems.