From the motherboard layout in the user manual on page 7, it looks like a 6-pin PCI-e power cable from your power supply will work.
What do you mean by find your usb 3.0?
From the specifications on page 11 in the manual:
- - Up to 2 USB 3.0/2.0 ports (available through the internal USB header)
- - Up to 8 USB 2.0/1.1 ports (2 ports on the back panel, 2 ports onboard, 4 ports available through the internal USB headers)
Chipset + 2 Renesas® uPD720210 USB 3.0 Hubs:
- - Up to 8 USB 3.0/2.0 ports (6 ports on the back panel, 2 ports available through the internal USB header)
Does windows Device Manager have any usb device errors?
Have you loaded Renesas drivers for the usb 3.0 hubs?