From the Alice Reviewer's Guide:
Alice: Madness Returns PhysX Settings:
There are three different levels of PhysX in Alice: Madness Returns: Low, Medium, and High. These settings can be adjusted by selecting the Options button, then clicking Video from the Alice: Madness Returns main menu. Each produces a different level of in-game effects and respective hardware requirements. Each of the settings is explained in detail below:
PhysX “Low”
All in game GPU-accelerated PhysX effects are disabled.
PhysX “Medium”
Enables GPU-accelerated PhysX elements including dynamic Cloth, PhysX Debris Particles, Volumetric Smoke, and Destruction particles.
PhysX “High”
Enables all GPU-accelerated PhysX elements enabled within the “Medium” setting as well as the Doom enemy volumetric oil simulation
Here are the effects:
Alice Effects
* Feather effects when Alice double-jumps
* Feather effects when Alice glides after a double-jump
* Rock mesh particles when Giant Alice stomps (Chapter 4)
Alice Weapon Effects
* Rock mesh destruction particles when the Hobby Horse hits the ground the first time
* Volumetric Smoke sprite particles and floating ember particles when the Pepper Grinder gun is used
* Glowing peppercorn mesh particles from Pepper Grinder Gun projectile impacts
* Tea volumetric steam sprite particles when the Teapot Cannon projectile impacts
AND the list goes on and on and on
Nvidia tested Alice and PhysX on High with a GTX 560 and found it ran about 3-4x faster than on the CPU
-- PhysX *is* particularly implemented well in this game
OK, technical lesson over -- i back to Wonderland
