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I would be curious to know this too. I have a 350, which I am very satisfied with, although I originally planned to get a 650. Playing with the two of them at the store, I could not see any difference in the speed of page turns, but that does not necessarily man anything. For some reason, this time around, Sony has not made public the processor speeds, as they have for previous models. This makes me suspect that they are using the same processor in both readers. Perhaps those who own both models would care to comment if they notice any difference in performance.
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