What is the maximum USABLE speed of a Micro SDHC card that can be used?

[MikeSp]

When I add a 64 gig micro SDHC card -- what is the maximum usable speed that can be used by the tablet -- no use spending extra money for a class 10 card if the tablet cannot access data that fast.

Thanks,

MikeSp

 

[EngineerGuy]

I couldn't find anything in the manuals which references card speed...just that the max size is 64GB. If I find anything I'll report back.