Compared to other post, I'm needing really high vcore settings for stability on i7 940

my bios:

CPU: HT & turbo off
loadline enable
uncore 16x
QPI 36x
QPI/VTT 1,28

182x22 prime95 12h stable at vcore 1,4, fails intelburntest within 5 sec
200x20 prime95 12h at vcore 1,4, intelburntest with maximum stress needs 1,425

What other settings is everybody using? Any other volt settings I can up in order to lower vcore?