The Tech Report investigates a question that is probably on the minds of those who upgraded their PC hardware just before the release of USB 3.0, is it worth picking up a PCIe USB 3.0 card?  They grab a Mukii TransImp TIP-PU301 2 port USB card and run through what you can expect in the way of bandwidth depending on the implementation of PCIe your motherboard has as well as the effect of legacy cables. 

Is it worth picking up a USB 3.0 add-in card? - General Tech 2

"SuperSpeed USB connectivity may be a nice additional perk as part of a future system, but is it worth the trouble as a standalone upgrade?"

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