I mean, the video card has 2GB GDDR3 of RAM and if a suitable threads 
are found for the GPU and all that work can be leaved in the video card 
memory until is needed.

Maybe, even the data in the video card memory could be used to give a 
partial rough preview as the scene is rendered, wouldn't be any clear 
sometimes but it could give you a hint what the GPU is doing on the fly, 
at least I think it would be cool to see it. Probably even won't be too 
much of a delay to display this since is already in he video card. Of 
course this is very optional.

Also I was wondering: what is the bandwidth between the CPU and the Main 
Memory at render time? maybe this can help us calculate a rough estimate 
of the bandwidth needed for the video card.

Cheers.

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