voltages for 3.0GHz on Q9300

xxcoop42xx

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Aug 7, 2008
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hey everyone, ive read the sticky on how to overclock c2d and c2q's and im still having trouble. i would like to oc my Q9300 to 3.0GHz but need the voltages for it. i keep freezing my cpu. so if any one knows the correct voltages and could share that would be great. my current cpu info is my cpu reference clock is at 360MHz and my fsb frequency is 1440. i used nvidia control panel to achieve this slight oc but would like to do it in the bios. the cpu core voltage is at 1.238v and the fsb is at 1.100v. any help is greatly appreciated.
 

br3nd064

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Every setup is different, so we can't give you an exact voltage for your cpu. I'd raise the voltage to ~1.3v, then raise the speed to 3.0ghz, and lower the voltage from there until it's not stable. You're probably going to need to raise the fsb voltage. Mine's at 1.3v.
 

br3nd064

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You may also have to bump the FSB voltage up. What ram do you have, and are you sure the ram's stable at that speed?
 

shizzzon

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I'm still tweakin mine but from what i've noticed, the only thing that has ever set me back is trying to OC the memory by using the wrong divider!

You have DDR2-800 so to pervent from overclocking your memory, your Mem bus needs to not go over 400mhz. I'm assuming it's rated at 1.8v for your memory.

I've been able to run at my stock VID of 1.2375 all the way up to 3.130ghz before upping the vcore. I'm running 3.45 right now on just air and still tweaking. Temps max out during video encoding at 61C right now and may be able to reduce those with some more tweakin but that's install, not yours.

Keep your vcore at 1.2375 OR 1.2500v, set all your other voltage levels to AUTO for the time being and if you can change your GTL reference, change it to .61x as .63x is risky for this chip from what i've read.

Now, to ensure you are not OCing your memory, make sure it says either DDR-800(and nothing higher in the BIOS) or look for this divider number-

The best one i could think of is 9:8
DRAM:FSB = 9:8

this divider may not even exist but i'm going to show you why i chose this number.

Your current FSB is at 360mhz. Your memory is only rated to take 400mhz.

Given a 9:8 ratio, at 360mhz, you can have your memory at 403mhz which is a hair over spec, equals nothing special.

I bet you are OC-ing your memory.

Download CPU-z then click the memory tab and it will tell you what your ratio is. Post it here if u cant figure it out and we'll be able to see if you are OC'ing your memory or not.

this chip is actually more stable at lower voltages.

This chip is stock at 2.5 with VID of 1.2375, i'm at 3.45 and not even surpassed 1.3v yet on vcore.
 

daedalusion

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Mar 26, 2009
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Hi all.

I am runnig a similar system. Gigabyte GA-EX38-DQ6, 4 gig Trancend AXE gaming ram 1066, q9300. You mentioned the ram having to be 800mhz, how will my ram running at higher frequency affect me overclicking the cpu in this instance (really want to but already blew the cpu once before)


Daedalusion
 

mamw93

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With overcloing a Core 2 CPU just remember... Bus Speed x Multiplier = Speed. You could try using other peoples' voltagesbecuase they vary depending on your case cooling, CPU cooling, how far you are trying to overclock, and your motherboard. You're just going to have to keep increasing the voltages until you find one that works... but don't go too high cause you could fry your CPU.