NB, VTT?

Here are my current settings (on ASUS P5E-VM HDMI) for 475MHz:

Clock Over-charging mode: 0.80v
vCore: 1.3250v (1.3120v idle real and 1.304v load real)
CPU volt ref: 0.63x
PLL volt: 1.58v
FSB volt (VTT): 1.28v
NB volt: 1.55v (no worries, since I have an Extreme Spirit II for my NB chip)
NB volt ref: Auto
SB volt: Auto

Rock solid so far, and I guess I'm just going to mod it as much. Might go even lower (I can do a lot of stuffs at 1.2875v vCore set in BIOS) but I wouldn't bother... since I've spent over three days trying to get the CPU to be stable at 1.3250v.