> I'm just thinking that if the CPU has to intervine that much, the PCI bus 
> is rapidly going to become a bottleneck to the whole system.

It seems that current GPU raytracers are 5-6x slower than CPU ones:

http://graphics.stanford.edu/papers/gpu_kdtree/gpu_kdtree.ppt

So there doesn't seem to be much benefit, even if you could easily utilise 
the GPU from POV.

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