Hi. USB 3.0 requires the use of PCI Express slots operating @ 5 GT/s (ie. Gen2 speeds), not Gen1 speed. As was confirmed earlier:
Re: SOC X1000 PCIe Gen2 @ 2.5 GT/s ?
the mini-PCIe interface is operating at 2.5 GT/s so very unlikely you will achieve USB 3.0 speeds.
Kumar