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CC can support thousands of books. I personally have 1400 on my "production" reader and I know of users with in excess of 15,000 on the device, so 600 books isn't in principle a problem. However, system memory might be a problem. The first gen kindle has only 512 MB of memory available to apps, which is not very much. In addition to having not a lot of program memory, the first gen kindle fire runs Android 2.3 (Gingerbread) that is known to have problems with memory management of images such as covers.
If you could send me a CC debug log then I might be able to tell you what the problem is. You send a debug log by going to CC's settings, scrolling to the bottom, and choosing "Send a debug log to MultiPie". It would save us a little confusion if you remove my son's email address (the multipie.co.uk one) so that he doesn't think the log is coming from the sky (as many do).
If memory is the problem then something that might help is to change CC's settings to use the smallest cover image possible. Because of Android 2.3 problems with managing memory used by images, making the images smaller can reduce memory requirements. You change the cover size by going to Settings / Covers and thumbnails / Downloaded cover size in pixels. Pick 160, then connect as a wireless device and let the sync complete.
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