Quote:
Originally Posted by RockdaMan
532 MHz on K2, KDX, KDX2, and K3 popped up in a quick Google. 256MB RAM, 4GB Flash.
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I believe that should be more than enough to get decent speeds for ePubs too.

Now I'm pretty convinced it's just the lockdown factor.
That, or Amazon could look at it for another (possible) advantage. There might be a likelihood of change/improvement in the ePub specs which do not exactly align with Amazons hardware upgrades. Which is another reason for them to go with a custom format (along with the money ofcourse).