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There is a Calibre tweak maximum_cover_size which will cause covers to automatically be reduced in size when added to Calibre if they are too large.
For covers sent to the device there is not much point having them larger than the device's screen resolution, and there is probably some size limit above which you will see problems, but I haven't noticed any problems with sending 1440x1080 covers to my 1024x758 Glo.
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