Serious +12v drop

Is this a motherboard problem or psu problem?

My system is at 90% load.

BTW, my usb ports doesn't work properly if I connect 2 or more usb devices.

Is this the cause of my malfunctioning usb ports?
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More about serious drop
  1. Almost certainly a measurement problem.

    Your hard disks probably would not even spin up and I would be surprised if the system even POST'ed with less than 10v on the 12v line.
  2. I would agree that it is not likely 6.8V on the 12V line. Seems like a bad sensor. Of course that doesn't mean that the 12V line isn't bad.
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