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Q6600 Overclock 3.4Ghz not stable

Last response: in Overclocking
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July 28, 2012 3:49:00 PM



Motherboard : Gigabyte GA-EP43-DS3
Bios : F10B
Processor : Q6600 , G0 .. with Spire Thermax Eclipse II Cooler, TX-$ TIM
PSU : Cooler Master eXtreme Power Plus 460W
Ram : Kingston DDR2 800MHz 2GB x 2
VGA : Gigabyte NVIDIA GeForce 9800 GT 1GB
HDD : Western Digital 1 Terabyte
OS : Windows 7 Ultimate 32bit

Guys im having a problem OC to 3.4Ghz.

im using : 378x9 , ive set my ram according to its timing.

i was having difficulty running prime 95. it would fail within the 1st minute.

I believe im having a problem with voltage. so i had to up my Vcore to 1.52 bios, and MCH Core 1.3 .. DRam 1.8V ...the rest i kept at normal. with this i was able to run prime for about 2 hours.Vcore was around 1.46.. then i notice the Vcore suddenly dropped to 1.42 and than one of the prime95 workers failed saying fatal error less the 0.4

I have a G0 chip, i believe 3.4 should be an easy task...my temp wont pass 60.

any idea what im doing wrong?

EDIT: im now running this.

400 x 8 Multiplier = 3.2Ghz
Ram Timing = 6-6-6-18 ..1:1
Cpu V-core 1.5V (bios) . HW Monitor 1.46V idle. 1.41~1.43 on load.
Cpu Termination : 1.3
CPU PLL : 1.59
CPU reference : Auto

MCH Core - 1.3
MCH Ref - Auto
MCH Dram Ref : Auto
MCH ICH - Auto

Dram Volt- 1.8v
Rest all on auto.

running prime95 now about 3 hours on 3.2Ghz 400x8. so far seems ok. but my real target is 3.4Ghz ~ 3.6Ghz, will this be achievable ?

July 30, 2012 2:29:06 PM

try 450.8 config
and increase core voltate to 1.6
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July 30, 2012 2:36:11 PM

Most Q6600s can't go that high. Even 3.33 is considered a "good" overclock, that's as high as I could get mine stable. Your VCore is approaching the absolute max so you may have already hit the most your processor can handle. Keep in mind that the Q6600 is actually two separate dies

Do not under any circumstances increase the voltage to 1.6 without compression cooling
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July 31, 2012 2:42:16 AM

well after more testing, 400x8 3.2Ghz @ 1.44Vcore(bios) setup is running stable for about 4 hours on prime. im going to take that as stable for me, reason being my pc will never be pushed that much for that period of time ever. my max temp was only about 59C.

after much reading, i think the 2 main contributor on not being able to go higher is my MB and high VID chip.

i think i can go 3.4 by putting Vcore 1.5(bios), but im just going to remain at 3.2

1.6 Vcore???? that sounds RIDCULOUSLY high for me.
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July 31, 2012 2:44:05 AM

dev-er6f said:
well after more testing, 400x8 3.2Ghz @ 1.44Vcore(bios) setup is running stable for about 4 hours on prime. im going to take that as stable for me, reason being my pc will never be pushed that much for that period of time ever. my max temp was only about 59C.

after much reading, i think the 2 main contributor on not being able to go higher is my MB and high VID chip.

i think i can go 3.4 by putting Vcore 1.5(bios), but im just going to remain at 3.2

1.6 Vcore???? that sounds RIDCULOUSLY high for me.


1.6 is too high. 1.55 volts is the absolute maximum for that chip unless you want it to burn out in a few days

I also had a crummy Q6600. 3.2 is fairly easy using 400*8, 3.4 was doable with a high Vcore, 3.6 was unattainable
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July 31, 2012 2:37:56 PM

Had a Q6600 run at 3.6 solid for a couple years...before that, it ran 3.4 for a couple years. Much of it depends on your VID, motherboard, RAM and powersupply. I had to run 1.475v to reach stability in Intel Burn Test @ 3.6ghz.

These CPUs are still very capable even today when coupled with updated graphics cards, good RAM and even an SSD.
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August 7, 2012 12:27:16 AM

Yup. My main contributors to a bad overclock.

1.motherboard
2.high vid cpu 1.325

So im gonna remain at 3.2 @ 1.44vcore.
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August 7, 2012 4:46:38 AM

dev-er6f said:
Yup. My main contributors to a bad overclock.

1.motherboard
2.high vid cpu 1.325

So im gonna remain at 3.2 @ 1.44vcore.


Smart move. One of the biggest mistakes that people keep making is trying to push their CPUs farther than they can realistically go. This damages the CPU and the motherboard
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August 7, 2012 6:15:14 AM

bhavyesh said:
try 450.8 config
and increase core voltate to 1.6

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August 10, 2012 4:48:24 AM

Best answer selected by dev-er6f.
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