@Hammer
Using just 4 graphics cards it not a problem, even for CUDA on Windows. The Fastra-II, however, has 7 cards. ASUS had to provide them with a modified BIOS in order for the hardware to even start up, let alone getting all 7 cards mapped and working in the OS. They were able to do this because linux is open enough for them to make whatever modifications they needed to low level kernel code. Good luck achieving that with closed a source OS.
Either way, I've yet to see any evidence at all that running Windows for this purpose offers any tangible benefits at all, or is even capable of reaching performance parity with linux for the same job.
It's all horses for courses. I'll happily fire up Windows for Gaming but for CUDA, it's of limited use to me. The exact same GPU kernel (same object code produced by NVCC on my machine) takes longer to run and slows down the machine on 64-bit windows than it does on my 64-bit linux install... *shrug* _________________
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Karlos 
