I think I have probably one of the worst vdrop/droops I've seen:
examples:
E8400 @ 3.6 VID 1.225
GA-P35-DS3L rev 2.0 (cheapest P35)
mit 1.262
bios 1.236
cpuz 1.216
load 1.20

for 4.0 I would have to set mit over 1.4
I need 1.28 for 3.8 in cpuz
crappy batch I believe (808A169)