I agree Bruc ASUS stuffed up the USB on rear, I have two of these boards and they are both the same.If you have a USB Keyboard USB microphone in you lose your ASUS Xonar Essence One Headphone AMP, it is musical USB ports you will find one combination where you can get them working. I solved this pain in the arse they created by purchasing a PCI-X USB3 internal card from texas instruments. Because unlike asmedia they could get it right. Both boards operate exactly the same so there is something wrong with this boards design. drivers or bios updates have not rectified this. Asus is aware of this issue but is remaining quite as usual