Dont worry to much about it... If it was actually 9~10V instead around 12V it would be way out of spec and the PC could not operate properly... The acceptable fluctuation is +/-5% (11.4~12.6V)I have the same MB and just updated to 2901 and have been getting really worried about my 10v reading. Good to I'm not the only one and that my PSU isn't actually dying...