FSB voltage = FSB termination / CPU VTT
MCH voltage = north bridge voltage

I'm running 509FSB now and left my CPU VTT default but need to increase my NB voltage to 1.5x volts.

for stable fsb, increase the MCH voltage and not the FSB voltage?
what is the default NB voltage?

I can't recall but my current Foxconn Mars is 1.25V. For the Gigabyte, it's not stated but there are options to increase by +0.1, +0.2, +0.3
Increasing the NB voltage would help and you only need it if you're going high FSB's (i.e. above 450).

For FSB voltage, it's very much CPU dependent and I don't think it makes a lot of difference on Core Duo/Core 2 Duo (at least for my case)
Hope this helps.

thanks for the info, conclusion is to increase the nb voltage instead of fsb voltage.

i am not running 505X7. It crash in games. So i iwll try increasing the nb voltage and leave the fsb voltage at default.

thanks again

What's your CPU and current settings? Maybe having it in your signature or put this down would be helpful.

I find that there's no fixed default NB voltage for the P35 chipset.

A lot of sites say it defaults at 1.4v. My mobo defaults at 1.31v......

E8400 + p35-ds3 rev 2.1 + team elite 4gb ddr800 + silverstone 560W + zotac 8800GT

vcore in bios is 1.206v
MCH voltage + 0.1v

I had tested my ram with memtest for about 2 hours. Definitely not the ram problem. My ram can go up to 509@1.9vdim

My cpu can go up to 3.6 @1.206vcore prime stable.

The only thing now is the motherboard. I had increase the MCH voltage and priming now. Will see how it goes

So what's your current settings? 9 x 400 or 8 x 450?
It can be a lot of factor and heat could be one, voltages, hardwares, etc.

current setting is 500 X 7

idle vcore 1.152
load vcore 1.184
temp load from everest reading
core1 72
core2 70
cpu 60

how much can i increase the MCH voltage which is still consider safe for stock cooling.

Agree.Over 4ghz is where the challenge are.

uhm.. mind if i ask?
can someone teach me the basics and fundamentals of overclocking?
btw,im changing my ram choice;Corsair Dominator DDR2 1066mhz x2

hmmm this is the OC thread buddy, all of us OC. So dont feel shy to give us the questions. All of us could teach you. Me noob, i cant really teach la.. but some here are really good.

Hello there.. im new with OC.. Planning to built my new gaming pc.. My bud is Rm5k.. here r the item im planing.. suggestion r most welcum..

C2D E8400
Abit IX38 QuadGT
XMS2 6400C5DHX D2 (2X2GB)
W.D 320GB Sata2
Asus EN8800GTS 512MB DDR3

which board will give be the best out from the processor???

Get Foxconn Mars/DFI LP DK P35 T2RS/Abit IP35 Pro.Since you don't crossfire so P35 is better choice as it oc better.For 4GB ram kit,get G Skill DDR 2 1000 kit,Corsair mean crap shit unless dorminator.

How much is abit Fatal1ty FP-IN9 SLI mb cost?.. it has gd ratings on it.. G Skill is using which chipset is using?

your load temp looks quite high.
wonder at which temp we consider not safe bcause of the temp reading bugs?

@cyberfly

the CPU temp and CORE temp izzit the same?

Guys, need some help here...OCed my E8400 to 465X8 fsb with vcore of 1.25v stable...but when increased to 470, orthos will fail in minutes...already raised my mch n fsb voltage both to +0.1v....also loosen my rams to 5-5-5-12 with 2.1v vdimm....anything else I'm missing here?

whoah... ur proc so good can go so far with so low vcore? btw...its time to up more vcore n see how it goes....

I'm still not so expert in the mch n fsb voltage...how do we know WHEN we need to increase it?Any clue?

how much E8400 can go without setting the voltage value?

here's kmarc's guide to help



well it depends though... just keep on pushing 5mhz with at a time with ram at 1:1 till u fail orthos.. if u got a good batch u can go all the way to 3.8ghz on stock vcore

can gv more details?such ur vcore set in bios,idle n load..vNB..how long ur prime 465x8?priority 8?

Mine can reach 420x9 everything at stock. Anything higher than that is unstable.

Vcore in bios forgot already...haha...will check back after this...according to CpuZ, idle @ 1.232 and load @ 1.200....vNB +0.1 in bios....primed 465x8 for 6 hours stable...yeah priority 8...will get back to u guys with the vcore set in bios...

whose said can stable? i can do mine 450x8.5 stable prime for 12hours on stock vcore 1.184v..n stable oso for 445x9 1.24v and 4.3ghz 1.37v

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Added on March 4, 2008, 11:48 pm
for the NB +0.1 mean how ur current vNB?ur stock 1.33v?if yes try to up ur vNB abit..

How to check the stock vNB bro?

u got any display in ur bios about current vNB? beside the +0.1?coz not too familiar with gigabyte bios

As I remembered no...but will check later...anyway I'm using the stock NB cooler...n it's freakin hot!!!Is it safe?

dont u got any print screen of ur temp when load?hmm i mite advise u to put fan on it..blow ur Nb n ram...u cab gv try to add up ur vNb since u go high fsb now..erm y not try with lower fsb using multiplier x9?

Ok my vcore set in bios is 1.275 rite now...add up vNB?How much bro?That's what buggin me...lower fsb with multiplier of 9?Don wan laa...coz I think higher fsb is better than higher multiplier...

uv vcore is ur vid..the vid let it be..try get ur vNB for 1.4v

So don't increase vcore anymore?But how am I goin to know what's my board's stock vNB?Can't find it in bios...not in the manual also...

yup try saty with current vcore..jus up ur vNB..u can try everest..iinm it got..else i dun no may other can help..btw gud luck bro

Ok, I've checked using everest n it shows my vNB is 1.25v now...I've raised 0.1 in bios so it should be 1.15v stock rite?

erm very low ..coz mine for dfi stock oredi 1.33v...iinm for >400fsb u need around 1.4v vNB

Hmmm maybe I'm wrong...any1 else using this mobo can prove this?....rite now priming on 475x8@1.275v...really hoping to reach 4Ghz without much voltage increase...

i think ds3 dont have sensor for vmch/vnb

foxconn mars is so far the top rated p35 mobo in LYN. As well as the IP35-E/ by me, i dunno bout others 4GB i think that you ask shawty, coz he is very good with ram selections. /Corsair nothing less than dominators, otherwise its better off buying value ram.

And one more thing, try not to trust paid reviews.

Yeah after searching in the net, I agree with u bro "jarirata"...then how am I goin to observe them?Gigabyte only allows end user to increase them 0.3 max....it's time for a better mobo i guess....

Are you on drugs? What do you mean by 'who said can stable?'

I was referring to my E8400, aren't I?

lol good one.i don't understand his english either. 'who said can stable?'
lol is that a question?, kianwee said la!! lmao

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Added on March 5, 2008, 5:06 pmbtw, i'm running my 8400 at 430x9 using ds3 ver 2.0
voltage i put at normal, never touch.... crysis game for 6 hours non stop, no prob...

erk nice askin btw i dint take any drugs my typo..its shud be "who said can cant stable?" coz tot u said cant stable if go higher with stock setting..but didnt realize u predi mention "mine........" np

Don't even bother with SLI board,get a P35.I am not sure about the chip but overclock good.

Which one is much powerful E8400 or Q6600?

err for multithreading Q6600 and head room for OCing its E8400. Both have different architectures. So hmm its hard to make a comparison though i would say in my point of view, the Q6600

hehe..nothing to do wooo..assuming the normal is at 1.3v la...so if 0.3 mean 1.6v lor...


go higher...under 4.0GHz is low OC for E8400....

Assume only?I see...your mobo also don't have the readings for FSB voltage n mch?

all ds3 mobo dont have it..

is it really necessary to change the stock fan to a custom one?
lets say for a q6600