computer woes?

possibly. i think my system may be getting under-volted. here are the cuurent stats:
+12v running at 11.776
+5v running at 4.919
+3.3v running at 3.312
Vcore running at 1.392-1.408 (i think it should be about 1.5)

it doesn't seem to be causing any major problems, although probably about once a month i get a notice that says my graphics card isn't getting enough power, and is reducing its performance to compensate. which is not cool.

is there something i can tweak to fix this, or should i be looking for a new power supply?