heres what this guy had to say
''Was getting BSODs with USB 3.0 host controller; tried to download version 0.118 from etron.com (under USB3.0 Host Controllers -> Driver Download), but problem persists. WORKAROUND: Uninstall Etron USB 3.0 drivers (I had to disable USB 3.0 controller on the motherboard to uninstall; otherwise, the uninstall process kept causing a BSOD). The built-in Microsoft drivers (in Windows 8.1; not sure if suitable drivers are included in earlier Windows versions) seem to be stable.
http://www.newegg.com/global/uk/Product/SingleProductReview.aspx?ReviewID=3984629
ya , like I said I had a asus 990fx with the asmeida usb3, and it was to the best I could figure out crap ...
looks like amds solution for usb3 on them boards is it works or it don't best I can see from it I been googling it around but really found much of nothing as far as added help for you on this ... sorry
''case has only 3.0 ports if it would work as 2.0 instead ''
should be all backwards compatible so no issues