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C2D E8500 OCing help

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  • CPUs
  • Overclocking
Last response: in Overclocking
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September 22, 2012 5:14:43 AM

Hey I'm wondering if anyone could assist me with the issue I've been having recently. My issue is with changing the CPU Host Frequency from the default frequency of (333.3Mhz x9.5=3.163.5Ghz) to at least (400Mhz x9.5=3.800Ghz)

Now the problem.The problem is that I change the frequency to my desired measurement of 400 and adjust the Vcore voltages to work in tandem with the new frequency. I save my BIOS settings to CMOS and attempt to reboot. When I say attempt I mean that the computer fails to boot about 2x and rarely 3x. I'm almost positive that the settings aren't going through properly making it unable to start till the BIOs reverts, after it boots regularly.
I check the BIOS to see if the settings have saved and all of my settings are still there. When I boot into windows and check CPU-Z readings it's still at default stock speeds excluding the multiplier which is able to change and is read in windows?
In short it cycles 2-3x before it boots into windows


Core Speed:3166.35 Mhz
Multiplier:x 9.5
Bus Speed:333.3Mhz
Rated FSB:1333.2Mhz

EIST & C1E are disabled

CPU: Intel C2D E8500 @3.16Ghz
Motherboard: Gigabyte GA-EP45-UD3R rev1.0
Memory: G.Skill 6GB DDR2 800 PC2 6400 5-5-5-15
GPU: eVGA GeForce GTX560 @ 955/2140/1920 OC
PSU: Corsair 650W
OS: 7 Ultimate SP1 x64

I was thinking it could be a BIOS issue seeing as it's at F3(Fresh out of factory) and the most recent flash is F12. Will updating my BIOS maybe solve this issue? Q-Flash obv :kaola: 

More about : c2d e8500 ocing

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a b K Overclocking
September 22, 2012 10:11:41 AM

Coffey_Johnty said:
Hey I'm wondering if anyone could assist me with the issue I've been having recently. My issue is with changing the CPU Host Frequency from the default frequency of (333.3Mhz x9.5=3.163.5Ghz) to at least (400Mhz x9.5=3.800Ghz)

Now the problem.The problem is that I change the frequency to my desired measurement of 400 and adjust the Vcore voltages to work in tandem with the new frequency. I save my BIOS settings to CMOS and attempt to reboot. When I say attempt I mean that the computer fails to boot about 2x and rarely 3x. I'm almost positive that the settings aren't going through properly making it unable to start till the BIOs reverts, after it boots regularly.
I check the BIOS to see if the settings have saved and all of my settings are still there. When I boot into windows and check CPU-Z readings it's still at default stock speeds excluding the multiplier which is able to change and is read in windows?
In short it cycles 2-3x before it boots into windows


Core Speed:3166.35 Mhz
Multiplier:x 9.5
Bus Speed:333.3Mhz
Rated FSB:1333.2Mhz

EIST & C1E are disabled

CPU: Intel C2D E8500 @3.16Ghz
Motherboard: Gigabyte GA-EP45-UD3R rev1.0
Memory: G.Skill 6GB DDR2 800 PC2 6400 5-5-5-15
GPU: eVGA GeForce GTX560 @ 955/2140/1920 OC
PSU: Corsair 650W
OS: 7 Ultimate SP1 x64

I was thinking it could be a BIOS issue seeing as it's at F3(Fresh out of factory) and the most recent flash is F12. Will updating my BIOS maybe solve this issue? Q-Flash obv :kaola: 


Check the memory frequency, everytime you change the bus speed it will change the memory frequency which is most likely the cause of your computer unable to boot. Set the memory frequency back to 800 Mhz after you change the bus speed to 400 Mhz. Make sure you apply adequate vcore voltage as well for it to boot.
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September 22, 2012 12:12:52 PM

Best answer selected by Coffey_johnty.
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September 22, 2012 12:13:04 PM

That seemed to do the trick wonderfully, I'm now at 400Mhz x 9.5 so 3.80Ghz which is a nice jump from 3.16Ghz if you ask me. :bounce:  I'm guessing that I can leave the DRAM frequency latch on auto or set it for 400Mhz to be absolute?
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a b K Overclocking
September 22, 2012 11:51:33 PM

Coffey_Johnty said:
That seemed to do the trick wonderfully, I'm now at 400Mhz x 9.5 so 3.80Ghz which is a nice jump from 3.16Ghz if you ask me. :bounce:  I'm guessing that I can leave the DRAM frequency latch on auto or set it for 400Mhz to be absolute?


Either way is fine since auto means that it will run at the specified frequency set by the manufacturer. If you want to be sure, manually set it to run at 800 MHZ DDR effective clock at the specififed voltage as set by the manufacturer to avoid damaging your system.
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September 23, 2012 4:26:15 AM

jacknhut said:
Either way is fine since auto means that it will run at the specified frequency set by the manufacturer. If you want to be sure, manually set it to run at 800 MHZ DDR effective clock at the specififed voltage as set by the manufacturer to avoid damaging your system.

The max the latch can go is to 400Mhz so I'm just going to stick with that setting. My bus is currently at 400Mhz with a rated FSB of 1600.1Mhz, I attempted to push it up to around 4Ghz but ran into a BSOD but it's fine 3.8Ghz is quite nice at the moment. Tips on pushing it further would be appreciated for sure though! :kaola: 
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