Without knowing what else is in your system it is hard to tell. Even still, I have seen motheboards go as low as 0.05v undervolt. Mine is about 0.025 and another one that I had (the same mobo model and version!) undervolted 0.05 (1.7 was about 1.65v, etc.). If you are wondering if it is your PSU though, look at what MBM says your +12v and +5v rails are pushing. If they are within 5% of the number (e.g., 12V is 11.4 or greater) then your PSU is doing fine.