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Unable to get 3.2Ghz on E6750


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Been trying to reach 3.2Ghz overclock but always failed after 1 hour of Blend torture test


My Fsb : pcie = 1:1 at 100MHz

FSB = 400

mem timings = 4-4-4-12

Vcore voltage = 1.35V

Mem voltage = 2.2V


Anybody using this motherboard? it's not the pro version

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Download memtest from http://www.memtest.org and extract the ISO image. Burn the ISO image to an CD-ROM disk. Please download CPU-z from

Here and post screen shots of your CPU/Memory/SPD tabs after the overclock.. You can use http://www.photobucket.com to upload the graphics.

Download Prime95 (OS: 9x/Me/NT/2k/XP) --->


Download Prime95 (OS: XP x64/2003 x64) --->


Download Core Temp



Enter your BIOS Setup Utility and load default settings. Save default settings and reboot. Enter your BIOS and set:


OC Guru


CPU Operating Speed = User Define

External Clock = 400Mhz

Multiplier Factor = 8

DRAM Speed = 1:1

PCI-Express Clock = 100Mhz


Voltages Control


CPU Core Voltage = 1.4v

DDR2 Voltage = 2.0v

CPU VTT 1.2V Voltage = 1.27v

MCH 1.25v Voltage = 1.33

ICH 1.05v Voltage = 1.10

ICHIO 1.5v Voltage = Auto

NB Voltage = 1.4v

DDR2 Reference Voltage = +2%

CPU GTLREF 0&2 = 67%

CPU GTLREF 1&3 = 67%


Advanced Chipset Features


Memory Timing Setting = <Press Enter>


CAS Latency Time (tCL) = 4

RAS# to CAS# Delay (tRCD) = 4

RAS# Precharge (tRP) = 4

Precharge Delay (tRAS) = 12

Refresh Cycle Time (tRFC) = 35


Advanced Memory Settings


Write Recovery Time (tWR) = Auto

Write to Read Delay (tWTR) = Auto

Act to Act Time (tRRD) = Auto

Read to Precharge (tRTP) = Auto

Command Per Clock: 2


Boot to the optical drive with the memtest disk and allow for two full passes. Run Prime95.



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CPU Core Voltage only in 0.2 increments. (either 1.39 or 1.41 Volts)

No ICH 1.05v Voltage setting

no ICHIO 1.5v Voltage setting

no NB Voltage 1.4v setting

no DDR2 Reference Voltage setting

CPU GTLREF universal not separated can be set at 67% I guess for all 0&2 and 1&3


When I tried the CPU Core Voltage 1.39

DDR2 Voltage = 2.0

CPU VTT 1.2V Voltage = 1.275v (it only has 1.237 or 1.275)

MCH 1.25 Voltage to 1.33V



with all the memory timings as advised, immediatly memtest 086+ booted with CD gives an error

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That is a moderate overclock and many changes should not be necessary. I have taken four E6750's to 3.6+ GHz. All were done on variations of ASUS including the low end ASUS P5B.


One thing to try. Set you previous settings and change the PCI-e to 110Mhz. Test with Prime again.

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Is it better to test stability with memtest then small fft in ortho

or go for the blend test in ortho?


cos when I tested with memtest it was fine for 6 rounds, then with orthos small ffts it was also good for 4 hours. but when I DID the blend test, it only runs for 14 minutes.

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No crashes whatsoever, everything seems to be fine. I reached my goal to overclock to 3.2Ghz with 4-4-4-12 mem timing and stock voltage. Pretty happy about it, not thinking of going further for a while. Thanks for all the help Derek! Cheers.
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Hey jeremy, I also have an E6750 that I currently have OC'd at 3.4 GHz. Sidetrack - Derek, I'd love to see some of your BIOS settings for the systems you have OC'd with this chip as I want to get mine up to 3.6 GHz as well. PM would be great.


Ok, back to the topic, I also ran into problems with Blend tests using Prime95 and have come to the conclusion that the program is buggy. I was able to run Small FFTs for many hours with no errors, same with Memtest. Sometimes Prime95 would not actually find an error, the program itself would just crash and prompt me to send an error report to microsoft. I have had similar problems with Prime95 Large FFT tests. I have Orthos, but have never used it.


As Derek said, getting to 3.2 GHz with that chip should not require you to change very much. If it is GO stepping like mine, you will more than likely not have to adjust the CPU voltage at all. Using my setup, I did not have to start adjusting the voltate until I raised it up to 3.3 GHz, and that was only a minor increase. I had everything set to default settings when I clocked up to 3.2 GHz and was able to run Small FFTs and Memtest for several hours with no errors.

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Sidetrack - Derek, I'd love to see some of your BIOS settings for the systems you have OC'd with this chip as I want to get mine up to 3.6 GHz as well.


The last one I clocked up was an E6750 (btw, all 6x50's are G0 Steppings) and I didn't have to do much other than raise some voltages and set to 450 X 8. I used 8500C5's with it. The Board was a P5K-E/Wifi (only because I can't find the non wifi's around. I set to ~1.5V in the BIOS, termination voltage was ~1.45v. North Bridge was ~1.4. There was not much else needed as the P35 chipset really doesn't need a lot of tweaking. I have worked with more E6850's though. Cooling was a Tuniq Tower.

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