On Fri, Sep 5, 2014 at 4:36 PM, Matt <matt.mailinglists at gmail.com> wrote: > Tried it and CentOS 6 did not seem to find it. Anyone know of a USB > 3.0 card that does work with Centos 6.x? I've used a variety of no-name cards with the NEC (now Renesas) uPD72020x series host adapter chips, and they've all worked fine. I'd steer clear of the "no additional power connection needed" cards; in my experience they can't supply the maximum power the ports may require (5V at 900mA per port, i.e., 4.5W per port, 18W total for a four-port card). Proper USB 3.0 cards have a disk drive power connector for the power required. In principle it's possible for a PCIe USB host adapter to have a switching regulator to provide sufficient USB power from the +12V supply rail, but, I have yet to see one that does.