FYI:

"11-11-2011: Masaharu- USB 3.0 is no go

Regarding USB3.0 enclosure

We have already developed it and the product number is "USB3380". However, it is not suitable for PC consumers but for embedded system, because installed video card can not be used directly and lots of device driver modification is required, due to bus architecture difference between PCIe and USB3.0.

The USB3380 is available at PLX or PLX's distributors, however we still recommended except for embedded systems."

-Forrás: TechInferno, Nando4 az egpu-s topic "vezetője" és Masaharu a BPlus (HWTools) fejlesztő mérnöke közti levelezéséből.