@DAX
Not sure about GPGPU on all hardware architectures, but CUDA on linux kicks #### plain and simple. I've used it on both linux and windows and although the tools available for windows are perhaps nicer (better integration with VS etc), raw performance is hard to beat on linux. I have no idea why it should be the case other than the fact that perhaps linux is just more efficient at dealing with high load tasks in general. I've also found it to be more stable for long running compute tasks and better at distributing load between multiple GPUs.
In fact, the Fastra II (http://fastra2.ua.ac.be/), which AFAIK is the fastest "desktop" GPGPU computer around is only made possible via Linux. It has 13 G200 class GPUs which required a custom motherboard bios just to allow them to be mapped in and they've had to modify the kernel to allow all the cards to be accessed. You won't get away with that sort of thing on Windows :) _________________
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Karlos 
