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GPUs suck at accessing main memory.
But they're very, very good at accessing on-board memory. See, for example (from a couple of years ago)
http://blog.cudachess.org/2009/07/cpu-vs-cuda-gpu-memory-bandwidth/
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I predict it'll take... mmm... 3 weeks after source code is released for the first faster-on-a-GPU solidcoin 2.0 closed-source miner to come out. 8 weeks until there's an open-source one available.
But my predictions are often wrong.