I have been having crazy USB issues with my board, so first tried stock clock settings, same, system USB backpanel ports occasionally would not be recognized on startup. Tried going from P09 to P06 to P03, same. A while back I had taken the system off the UPS as at 4 ghz it pulled too much through it (rated 650v) and scream overvolt and commence shutdown. I reconnected the UPS using P09 at stock speed for CPU and memory and viola', no more USB gremlins! The UPS (Belkin) also has power conditioning.
Now its time to get a bigger UPS toget back to 4 ghz.
Just thought I'd share, this took a while to sort out and I debated ditchng the board. Glad I stuck with it!
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