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dunno about the clara hd, but my aura h2o came with a very fast card out of the box
it was faster than any other cards I had at home at the time
pretty much all cards you can buy today, should be fast enough for ebook readers. it won't change some things being slow...
a lot of operations will run from ram (cache) anyway, the devices have plenty of ram (for ebook reader) which is rarely ever actually used.
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