yeah vdimm is ram voltage, i use about 2.1v on all ram, the red is pretty much just to let you know you've gone over standard.

Try this:

vcore = 1.35 - 1.40v
set 401 FSB
RAM timing = 5-5-5-15-6-42-10-10-10-15 (down the page)
Vdimm = 2.1v