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Overclock Q6600 to 3.8GHz

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June 21, 2012 3:32:46 PM

Hi guys.

Im getting a Antec Kuhler H2O 920 tommorow and am wondering what voltages and speed settings i need for a stable overclock @ 3.6GHz.

Il put all my specs here if that helps.

CPU: Intel Core 2 Quad Q6600 @ 2.4GHz
RAM: 2X 2GB DDR2 RAMos 800MHz
Mobo: XFX 780i 3-way SLI Mobo
GPU: XFX GTX 285 1GB single card (Stock Clock)
PSU: Thermaltake Ultra 120 fanless passive
Case: Antec DF-10

Also a side question, is it best to go with the Kuhler H2O 920 or should i buy the TPC 812??

Thanks for the help guys/girls

More about : overclock q6600 8ghz

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June 21, 2012 6:31:48 PM

Quote:
Also a side question, is it best to go with the Kuhler H2O 920 or should i buy the TPC 812??


It's a wash...very, very close performance either way.

You're likely going to need a vcore of ~1.475v (I did for 3.6ghz stability). You'll want to look at the Core2 overclocking guides and apply them as needed. Each system will respond differently to different BIOS settings due to differences in your specific CPU, motherboard, RAM and power supply.
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June 21, 2012 6:58:32 PM

The highest I could get my old Q6600 to was 3.33 on around 1.475v. I couldn't get it stable at 3.6 even at 1.5v so I backed off. I ended up replacing it with a QX9650 which ran at 4Ghz for years
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June 21, 2012 7:04:32 PM

Read some guides. Lots of them, if you can. There's plenty right here on these forums, use the search. Core 2s are harder to OC than first gen i-cores (i3/i5/i7s), and both second and third gen i-cores are a piece of cake (assuming their unlocked).

So, yeah, it can get tricky to push the limits of that CPU. Read up on it first, know what you're doing and what the CPU's limits are for both temps and voltages.
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Best solution

Anonymous
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June 21, 2012 7:27:32 PM

give this a read:
EVGA 780i Overclocking Guide
XFX, EVGA, same board.
1.5 volts is the highest in specs
Intel® Core™2 Quad Processor Q6600
VID Voltage Range 0.8500V-1.5V
if you can get it stable under 1.5 is better :) 
really isn't THAT hard, however depending on the CPU itself, your mileage will vary.
unlink the RAM until you get 1600(400) FSB then link it back 1:1.
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June 22, 2012 12:25:34 AM

Thanks for the help guys. I was just reading somewhere and someone mentioned that the 780i mobo's are good at auto overvolting. But il try and what i can do. i think 3.6 will be as high as i can get it. Iv had it to 3.4 stable however it was too HOT. Thanks guys
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June 22, 2012 12:25:48 AM

Best answer selected by wonder44.
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June 22, 2012 12:49:46 AM

The 780i mobos are horrible at everything imo. I've gone through 3 of them including an 780i SLI FTW. They are quite feature rich which is nice but the northbridge is weak and tends to pop. The system also experiences tons of frequency holes in the FSB which makes it annoying as *** to overclock unless you have an unlocked multiplier. I had a lot more luck with P45 chipsets.
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June 22, 2012 1:18:37 AM

looks like the right answer to me. Best nv 775 chipset
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June 22, 2012 2:54:21 AM

I had both 780i and 790i boards...both worked well, but the 790i seemed to be more solid above 3.2 (compared to 680i/690i which were almost impossible to work with).
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June 22, 2012 3:03:13 AM

oh god I had an Asus Striker II Extreme. Biggest piece of garbage ever

The NVidia 700 series was just a patched up NVidia 600 series so it wasn't much better at all.
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June 22, 2012 12:15:03 PM

rubix_1011 said:
Quote:
Also a side question, is it best to go with the Kuhler H2O 920 or should i buy the TPC 812??


It's a wash...very, very close performance either way.

You're likely going to need a vcore of ~1.475v (I did for 3.6ghz stability). You'll want to look at the Core2 overclocking guides and apply them as needed. Each system will respond differently to different BIOS settings due to differences in your specific CPU, motherboard, RAM and power supply.


1.47 ? wow what a terrible motherboard I was gaming at 3.8ghz at 1.3987v

I still have my q6600 and I just about bought a qx6850 for a 100 dollars but I thought what is another 200 mhz of overclocking going to do ?
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June 22, 2012 1:00:17 PM

That is not the motherboard's fault. It's the CPU. If you get unlucky enough get a CPU with a higher than average VID, you will need more voltage to overclock it.
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June 22, 2012 1:46:14 PM

jsc said:
That is not the motherboard's fault. It's the CPU. If you get unlucky enough get a CPU with a higher than average VID, you will need more voltage to overclock it.


Those boards all require lots of voltage to overclock all c2d

well my experience with the 780i always required more voltage to stay stable than even a p35 motherboard Q6600 and E8400 moving them back and forth so my buddy could sli 8800Gt's

Bad voltage regulation
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June 22, 2012 2:37:54 PM

jsc said:
That is not the motherboard's fault. It's the CPU. If you get unlucky enough get a CPU with a higher than average VID, you will need more voltage to overclock it.


Agreed. My G0 VID was 1.2250 and I could almost run IBT for 10 passes at 1.4500v @ 3.6ghz, but it would fail on pass 8 or 9. 1.475v was the magic number for 3.6ghz stable for 20+ passes w/IBT (never ran more than 25 or so).

Quote:
1.47 ? wow what a terrible motherboard I was gaming at 3.8ghz at 1.3987v


Congratulations.
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June 22, 2012 2:39:54 PM

rubix_1011 said:
Agreed. My G0 VID was 1.2250 and I could almost run IBT for 10 passes at 1.4500v @ 3.6ghz, but it would fail on pass 8 or 9. 1.475v was the magic number for 3.6ghz stable for 20+ passes w/IBT (never ran more than 25 or so).

Quote:
1.47 ? wow what a terrible motherboard I was gaming at 3.8ghz at 1.3987v


Congratulations.



Not sure if serious... Joker pic
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June 22, 2012 2:47:42 PM

More sarcasm than anything. Everyone knows that Q6600's were excellent chips in their day for cost and OC performance vs. that of the higher priced processors of the period. A 1ghz overclock is almost automatic on them, and you could simply jump from stock at 2.4 to 3.0 just by changing the FSB from 266 to 333 and nothing else making them a huge success for any novice overclocker. There are tales of many hitting 3.8 and some hitting 4.0 and 4.1, but those were very rare and few were stable. There was a wide range of VIDs for both B3 and G0 chips and typically only the G0's were capable of the best OC performance (but there were some B3 exceptions).
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June 22, 2012 3:22:48 PM

Lapped G0 w/cm212+ mx4 3.8Ghz 1.39xV 475mhz FSB 74C full load 2hrs prime Ep45-UD3R
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August 21, 2013 3:12:41 PM

I've got a Q6600 with a 750i SLI motherboard (Asus P5N-D) running at 3.6ghz @ 1.35v stable air cooled. You guys running with that high voltage need to raise your PCIE frequency so you can turn down the voltage. Leave it overclocked, then go into the BIOS and hopefully you have the option to raise the PCIE frequency because it makes all the difference in the world, just make sure to raise it with the overclock active.
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August 21, 2013 3:12:44 PM

I've got a Q6600 with a 750i SLI motherboard (Asus P5N-D) running at 3.6ghz @ 1.35v stable air cooled. You guys running with that high voltage need to raise your PCIE frequency so you can turn down the voltage. Leave it overclocked, then go into the BIOS and hopefully you have the option to raise the PCIE frequency because it makes all the difference in the world, just make sure to raise it with the overclock active.
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