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The Sony 650 has two GB of internal memory, mostly keeps the 600 user interface, has a gorgeous clear screen, and is reported to have solved the problems with crashing under large libraries. The first time it's asked to look at a lot of books, it takes a long time indexing the books. After that, it performs properly. I only have a few hundred on mine. I put it to work while I ate lunch and washed dishes. I've added a few books here and there since and it's had no problems or delays in dealing with them. Someone on the Sony forum probably has a larger library and could give you more details.
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