> That's just Gelato, which only works on NVidia GPUs. However, take
> a look at http://www.gpgpu.org, a repository for general purpose
> computing on the GPU. Quite a bit of general purpose computing can
> be performed on the GPU alone.
>
> OpenGL can be utilized as a general purpose interface to the
> current crop of GPUs.  Perhaps parts of Povray can be coded to take
> advantage of this. The only problem I can see is that NVidia GPUs
> use single-precision floating point and calculations may not be
> IEEE 754 compliant. On the other hand, NVidia is somehow able to
> get around this with their raytracer.

In the link you posted there is a paper that explains how to emulate higher 
precision floats...

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