Has the OP even verified that it is actually his PSU? I have a board with coil whine and my voltages are good. I know that these are estimates, but what do your voltages look like in the bios? I'm curious about your:
vcore, +12v, +5v, +3.3v and +5vsb.
Also that PSU has two 16A +12v rails. Not the best design but I wouldn't throw it under the bus yet. It's not like it is rated for 400W and you get 150W off 12v and 250W off of +5v and +3.3v. By spec it should be able to handle at least 300-watts on 12v.