my setting in bios is as so:

Vcore = 1.3375v
FSB voltage = 1.3v (if default is 1.2v can't remember )
MCH voltage = 1.6v (if default is 1.5v can't remember also)
PCIE voltage = +0.10v dunno what value and why wanna increase it, but just doing it for the sake of it.
PCIE frequency = 101mhz
FSB:DRAM ratio = 1:1
ram timing = 4-4-4-15
DDR2 voltage = 2.05v
Loadline caliberation control = auto
436 x 8.5 = 3700mhz

the rest i didn't touch

but as tkh bro said, each mobo are different from another. this values which i used on my Gigabyte X38-DS5 can only be used as reference for other ppl. hope it helps in some way.
and for those who think i can improve and correct. please share with me yah.

I like to play safe. and i seriously believe that a better PSU will enable higher oc for certain components (i can be wrong, but i'm just saying this based on my past experience). 460w should be just enough i guess, but if u plan to oc hard out on your new proc. u better look for around 500w+

wrong, it is the QUAD CORE which is tricky to overclok.

This post has been edited by metsatsu: Dec 5 2008, 08:17 PM

hhmm... not sure about the gigabyte X48. but my X38 is already struggling when it slowly touches 450. I was able to reach 450 when i was still using my Q9450. but then i have to increase the voltage all the way up to 1.325v and my vcore temp jumped up by 10c!!

As for your psu, it's rather subjective to conclude if it's underpowered. so yah, too bad... can't really tell. i would always spend some extra money to get higher power psu, to make sure that i dun regret later.

one bad thing about gigabyte mobo is that the gtl setting is not as flexible as other mobo manufacturers.

bro. u need to read this first. coz from what i see the way u described. u really have no idea what ur doing. if we were to explain to u based on your number of enquiries, i can write another long article of overclocking.

Bro hengmy. Mind to share ur bios setting? Though i know p45 has a higher fsb oc limit compare x38. But just wanna know, did u tweak anything else that enable u to oc higher other than up'ing all the voltages?

Cool thx alot! But too bad now in outstation. And using gprs to surf lyn. Will give my bios another tweak when i get back home. But i think in ur case, u got a good chip and good mobo combo.

Nah. The problem with x38 is that it has a rather low fsb oc limit. If u google gigabyte x38 tomshardware, u will find that its conclusion of the gigabyte x38 isnt very good

Sigh... Really hope that i can at least touch 3.8ghz without having to use some insane voltage

the limitation is on x38.

Yah bro. Roughly 440-450. So far i havent seen anyone with x38 mobo with quad can exceed that fsb limit, especially gigabyte x38...

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Added on December 27, 2008, 6:44 pmHere's the link of tomshardware review

http://www.tomshardware.co.uk/Intel-X38-Gi...view-29644.html

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Added on December 27, 2008, 6:45 pmHere's the link of tomshardware review

http://www.tomshardware.co.uk/Intel-X38-Gi...view-29644.html

This post has been edited by metsatsu: Dec 27 2008, 06:45 PM

66c @ 1.325v? that's an awesome temperature and vcore bro. Most of us here will only stop if it is exceeding 70c and 1.4v

1.6v on x48 is normal?? so does that apply the same to x38? coz they said x48 is basically cherry picked x38 right?

Guys. Just wanna make sure. Vnb is MCH voltage right? Not fsb voltage or vtt right?

Hey hengmy, meet ur arch rival, acecombat. too bad ace alrdy sold her q9450, otherwise we'll see more insane oc'ing of the q9450

come to think of it. hengmy's Q9450 is better. ace's vcore is almost 0.2v higher

hengmy bro. I've just realized that my x38 bios is quite different from your P45 bios setting. does your bios actually show all the voltages? eg. NB and SB voltage? if that's the case, that means u raised 0.4v on your NB right?

but the problem is that x38 doesn't show the default NB voltage in the bios. so not sure how much i should increase...

I've already googled around. Until now still no solid answer. Though i managed to findout that asus' x38 default's NB voltage is 1.25v, but not sure of gigabyte's... can we just assume they are the same?