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the problem with GPU general purpose programming is that the download speed from the AGP (and even pci-express now) to the main memory is hella slow. Don't expect more than 30 or 40Mb/s... I'll let you do the math to have the maximum framerate you can achieve with this sort of bandwidth.
Btw, even with a fx5900 the processing power is interesting, it's just that nvidia and ati doesn't want you to use the gpu for something they don't want (what, you wouldn't pay a lot of $$ for their crap PureVideo system !).
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