The process uses code from physics and character animation middleware maker Havok. Its Havok FX software provides an API for the mathematics games need to perform to work out how objects physically interact with each other - the effect of gravity, friction, mass, elasticity and so on. Havok FX runs these calculations on the host computer's GPU rather the main processor. Havok's approach frees up the CPU to focus on ever more complex artificial intelligence calculations.
Havok FX will have support for both a single NVIDIA GPU as well as two or more GPUs running in SLI mode. An SLI configuration will allow for a user to dedicate an entire GPU to graphics and one to physics. If the Havok FX engine is not utilizing the GPU, NVIDIA claims that the SLI configuration can still be used for increased graphics performance.
The two movies are both in .AVI format and roughly 21 MB insize.
The two mirrors you see below each serve one of the files (both are different movies).
Note:
If you have problems downloading NVIDIA physics-on-GPU Movies,
please try to stop using your download manager
and avoid right clicking on files. Also, check
your firewall settings, because some mirrors may
require that you do not block the HTTP
referrers. 
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