Solved Intel Q8400 Overclocking Help

Gigabyte / G31m-es2l
April 9, 2012 at 21:35:56
Specs: Windows 7 Ultimate, Intel Core 2 Quad 2.66 GHz / 4094 MB
Hey, there

I need help overclocking an intel q8400. I had been trying to overclock it for several months in the past but it would always end up with unstableness. So... I just gave up. X'(

I needs help so I can finally succeed in this. It will be greatly apriciated.

specs:

Gigabyte G31m-es2l
4 GB DDR2 (idk what brand I got them from; computerbay or somthing like that)
Intel Core 2 Quad Q8400 2.66GHz
Cooler Master Hyper 212 CPU Cooler
EVGA GeForce GT 220
Raidmax 500W Power Supply

YOLO


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✔ Best Answer
April 15, 2012 at 08:24:34
"I tryed somthing. Instead of setting the multiplier to x7 and the other thing to 400 to get 2.80GHz, I changed it to x8 and the Frequency to 350 to get the same 2.80GHz"

It's NOT the same 2.8GHz. One runs at 1600MHz FSB, the other runs at 1400MHz FSB. In other words, 8 x 350MHz is slower than 7 x 400MHz. I recommended that you use 400MHz for a reason.

Go back to 7 x 400MHz, memory multipler of 2.0, lock the PCIe at 100MHz, & increase the CPU voltage. Notice that I put "for starters" for the 1.20v setting, it's up to you to find which voltage setting will allow the system to boot & run stably with the overclock settings. Intel lists the max safe voltage for the Q8400 as 1.3625v. Try the settings I recommended but bump the voltage up to 1.35v. If it runs stably at 7 x 400MHz at 1.35v, try 8 x 400MHz. If you have to, bump the voltage up again.



#1
April 10, 2012 at 01:36:42
The problem is your cheap board lack necessary overclocking features.

You know the real meaning of peace only if you have been through the war.


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#2
April 10, 2012 at 05:39:24
Haven't we gone thru this already? Do you have the latest BIOS? All O/C settings will be found under MB Intelligent Tweaker. But without knowing what RAM you have (DDR2-667, DDR2-800, etc), there's no way to complete this list:

- enable CPU Host Clock Control
- increase the CPU Host Frequency from 333MHz 400MHz freq
- lower the CPU Clock Ratio to 7.0x (this setting is temporary)
- set PCI-express to 100MHz
- set system memory multiplier to ?? (this setting is critical)
- set System Voltage Control to manual
- set CPU Vcore to 1.20v (for starters)

BTW, consider getting a better video card & power supply, especially if you want decent gaming performance. Overclocking the CPU can't make up for the weakness of the GT 220.

http://www.guru3d.com/article/inno3...

http://www.guru3d.com/article/gefor...


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#3
April 10, 2012 at 16:38:32
Thanks for replying and thanks for the advice. I plan to get a gtx 560 ASAP.

My mistake about the RAM it's DDR2 400mhz. On the sticker on the ram it says it's 1066 but CPU-Z says it's at 400.

Since setting the system ram multiplier is a important and critical step I'll wait until your next post of advice...

YOLO


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Related Solutions

#4
April 10, 2012 at 19:42:01
RAM MULTIPLIER = RAM speed(DDR) / CPU frequency
800mhz / 400mhz = 2
For ratio 1:1 set the the system ram multiplier to 2

"My mistake about the RAM it's DDR2 400mhz. On the sticker on the ram it says it's 1066 but CPU-Z says it's at 400"
Don't mix frequency and speed
DDR2 400 = speed
DDR2 400 / 2 = 200 frequency
Your RAM is DDR2 1066 but current it is under-clocked to DDR2 800(400mhz frequency).

Sorry about my first post, i thought all of G31 boards lack necessary OC like CPU vcore, i gave myself -1 for not checking the BIOS.

You know the real meaning of peace only if you have been through the war.


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#5
April 11, 2012 at 00:31:47
I have applied all the settings and set the system memory multiplier to 2. But after the computer booted again it took an oddly long amount of time and the initiating BIOS showed that my CPU was at 2.33GHz (6x400) instead of 2.80GHz (7x400).

It's okay. You shouldn't have given your self a -1. As soon as this thing is solved I will gladly vote all up.

You're helps' is much oblidged!

YOLO


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#6
April 11, 2012 at 03:02:40
Find Intel speedstep in BIOS and disable it.

You know the real meaning of peace only if you have been through the war.


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#7
April 11, 2012 at 10:49:13
Found it and disable it. But still the same thing... It changes to 400x6.

YOLO


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#8
April 11, 2012 at 19:46:00
Disable spread Spectrum and C States. Fix PCIe at 100MHz.

You have to be a little bit crazy to keep you from going insane.


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#9
April 12, 2012 at 10:31:01
I've looked on the manual and the BIOS but I can't find 'spread Spectrum' or 'C State'.

YOLO


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#10
April 12, 2012 at 20:51:09
Manual:
http://www.gigabyte.com/products/pr...
Section 2-4 Advanced BIOS Features Pages 37-38

-> "CPU Enhanced HALT (C1E)"
CPU Enhanced Halt (C1E) (Note)
Enables or disables Intel® CPU Enhanced Halt (C1E) function, a CPU power-saving function in
system halt state. When enabled, the CPU core frequency and voltage will be reduced during
system halt state to decrease power consumption. (Default: Enabled)
--and--
--> "CPU EIST Functions"
CPU EIST Function (Note)
Enables or disables Enhanced Intel SpeedStep Technology (EIST). Depending on CPU loading,
Intel® EIST technology can dynamically and effectively lower the CPU voltage and core frequency
to decrease average power consumption and heat production. (Default: Enabled)
These are the ones you need to disable.
Most other settings are in section 2-9 on pages 47-48

You have to be a little bit crazy to keep you from going insane.


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#11
April 13, 2012 at 18:03:18
It finally booted up. I used all the settings you guys instructed including disabeling CPU Enhanced Halt (C1E) and Intel SpeedStep (EIST), but it still wasn't working. Only after I set PCI-E to auto it started to work. Now I'm going to test it with prime 95 and see what happens...

Well after running prime 95 it shows that one of the cores of stopped working in around min 7 of the test.

I tryed it three different times but it was still the same result...

I tryed somthing. Instead of setting the multiplier to x7 and the other thing to 400 to get 2.80GHz, I changed it to x8 and the Frequency to 350 to get the same 2.80GHz.

Everything else the same as I was told Memory multplr so it can be at around 800, the CPU Vcore to 1.20v, CPU EIST Function and CPU Enhanced HALT to disable. PCI-E on Auto.

I ran Prime 95 for about 15 min. and it looks like it might take that.. It's awsome!

I wouldn't have gotten this far with out your help. But I've heard this thing should go faster.

How do I get it to run at 3.20?


YOLO


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#12
April 14, 2012 at 17:49:44
Did u check CPU temp?

Only after I set PCI-E to auto it started to work
STOCK FSB / 100mhz = OC FSB / X, the formula can also work with CPU frequency (STOCK CPU freq / 100mhz = OC CPU freq / X)
1333mhz / 100mhz = 1400mhz / x mhz
105 mhz is the current PCI-e frequency
If u are going to increase CPU frequency without locking PCI-e frequency u gonna end up with unstable system(PCI-e freq also increase). If it is working well (350 x 8) leave it like that.

How do I get it to run at 3.20?
I think that is the limit but u can still mess with voltages to see of u can hit 3.2ghz.

You know the real meaning of peace only if you have been through the war.


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#13
April 15, 2012 at 08:24:34
✔ Best Answer
"I tryed somthing. Instead of setting the multiplier to x7 and the other thing to 400 to get 2.80GHz, I changed it to x8 and the Frequency to 350 to get the same 2.80GHz"

It's NOT the same 2.8GHz. One runs at 1600MHz FSB, the other runs at 1400MHz FSB. In other words, 8 x 350MHz is slower than 7 x 400MHz. I recommended that you use 400MHz for a reason.

Go back to 7 x 400MHz, memory multipler of 2.0, lock the PCIe at 100MHz, & increase the CPU voltage. Notice that I put "for starters" for the 1.20v setting, it's up to you to find which voltage setting will allow the system to boot & run stably with the overclock settings. Intel lists the max safe voltage for the Q8400 as 1.3625v. Try the settings I recommended but bump the voltage up to 1.35v. If it runs stably at 7 x 400MHz at 1.35v, try 8 x 400MHz. If you have to, bump the voltage up again.


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#14
April 15, 2012 at 18:30:56
When I set the PCIe locked at 100MHz it doesn't boot properly and the dual bios randomly sets it to 7 x 333.

I left it in Auto and used the recomended settings on every thing else with the voltage set to 1.35v, with the frequenzy and multiplier to 7 x 400 and the memory multiplier of 2.0. Then I set it to performed a prime 95 tourter test and it ran for more than with 20 minutes and passed without errors and the max temperature on one of the cores was 54°C. :)

Than I set it the multiplier and frequenzy to 8 x 400 with the same voltave of 1.35v.
It ran for about 8 minutes on the prime 95 totuter test when one of the cores stopped woirking. I assume thats instability so I stoped the test.

I bumped up the voltage to 1.3582v than again to the max safe voltage of 1.3625v and they both resulted in one of the core stoping at around minute 8 of prime 95 torture.

I'm going to try to bump it up a little bit more passed its max safe voltage to see what happens.


YOLO


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#15
April 16, 2012 at 15:37:00
YEAH! AWSOME! XD
It passed the torture test!

Intel Core 2 Quad Q8400 Over Clocked to 3.20GHz and 1600MHz FSB!

riider, kuwese, Fingers and computing.net
Thank you for all your help!

You guys are the best! God bless you my friends!

YOLO


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#16
April 16, 2012 at 19:20:48
Glad to hear it. Good Computing.

You have to be a little bit crazy to keep you from going insane.


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