Hi,
Just wanted to post about my recent experiences upgrading my XPENOLOGY box with this board. I, like a few others here had problems getting my USB 3.0 ports to work properly. Latest BIOS, different power supplies, etc.. They did not work in Windows as a test either, nor would they work in the UEFI BIOS with USB 2.0 keyboards and mice, even with legacy mode enabled. I did get them to work in XPENOLOGY with USB 3.0 devices thanks to some posters here by changing a USB BIOS setting (can't remember off the top of my head).
Here's the thing. This particular board also did not work with some faster RAM I had from the get go, so I had to use slower memory than I should have had to for the machine to even POST. Also, no USB 2.0 devices ever worked in the USB 3.0 ports, even with legacy mode enabled. My thinking is, when you load BIOS defaults with legacy USB mode enabled, everything should at least function in some capacity.
In the end, as I was able to, I returned the board. The new board works fantastically with faster memory, and the USB 3.0 ports work with BIOS defaults loaded. The USB 3.0 ports also now properly recognize USB 2.0 devices such as older drives, keyboards, and mice.
The moral of the story is, if you need to get the USB 3.0 ports working on a board you have had for a while, make the BIOS settings change listed earlier in this thread. If you just purchased a new board and are experiencing issues with your USB 3.0 ports, save yourself the headache of messing with it and just RMA it.
Frank