Q9400 overclock help

[matt768]

Need help getting a stable overclock, not for 24/7 use.

Q9400
750i ftw (latest bios)
2x2 corsair dominator 1066
vista x64

I'm trying to get stable at 3.6.

vcore 1.36250
ram 1.90
fsb 1.30
spp 1.50
nf200 1.40

gtlvref +65
gtlvref +65
gtlvref +30
gtlvref +30

Memory is at 800 5-5-5-15-2t

Spread spectrum and c1e are disabled.

Temps are around 55c during prime95. It can only run 5 passes and then fails.

Any ideas what I should be tweaking to get it stable?
Thanks

 

[Mr.Guvernment]

i leave all voltage settings as stock / auto, then overclock, once i hit unstable, i back down until stable, then i start to manually up the vcore until i hit unstable again, then backdown and add more volts, if more vcore dont help, up the northbridge core

 

[matt768]

I've been doing it how you suggested the past few days and have gotten it pretty stable at 3.1 with the following.

vcore 1.225
fsb 1.3
ram 1.9
spp 1.4
nf20 1.2

Now it goes unstable with these settings at 3.2. More vcore doesn't seem to help. Should I use more vcore AND more north bridge?