Ion is still under development, but they probably gonna release it by the end of the year. But CUDA and, futurely, OpenCL are amazing. Buy four gtx 295, put them on an 4 PCIe mobo(no need for SLI) and there you have: your own DeepBlue. It is a shame that those chip cant do otherthings(datatransfer, logical operations) as effective as they do number crushing but once this wall is down our pcs will "be faster then the speed of light".(and that will be a good bye to x86 architecture too
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