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Help request for overclocking Intel E8600

Last response: in Overclocking
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October 31, 2011 11:48:38 PM

Hi All,

I have two Intel E8600 systems that are almost identical and primarily used to process and manage digital imagery. The systems no longer perform as well with the latest software programs, such as Photoshop CS5, and the larger file sizes generated by the more advanced camera sensors. I plan to build an I7 2600k system in December or January, but also decided to try to overclock one of the E8600 units now. The overclocked unit is running at 4.20 GHz with seemingly no major issues, though one of the workers in a Prime95 blended test failed after 3:50 (the other worker was still on task when I terminated it after eight hours). Prime95 listed the following:

[Oct 31 04:42] Test 7, 180000 Lucas-Lehmer iterations of M532479 using FFT length 28K.
[Oct 31 04:43] Test 8, 180000 Lucas-Lehmer iterations of M524289 using FFT length 28K.
[Oct 31 04:44] FATAL ERROR: Rounding was 0.4753417969, expected less than 0.4
[Oct 31 04:44] Hardware failure detected, consult stress.txt file.
[Oct 31 04:44] Torture Test completed 167 tests in 3 hours, 50 minutes - 1 errors, 0 warnings.
[Oct 31 04:44] Worker stopped.

The CPU temps stayed under 65 degrees C during the tests.

Will someone offer advice on how I might stabilize the overclock and what additional improvements I might attempt, such as experimenting with the RAM settings?

My system:
Intel Core 2 Duo E8600
ASUS P5Q-E LGA 775 Motherboard
EVGA NVIDIA GeForce GTX 460 (Fermi) Superclocked EE 1GB 256-bit GDDR5 Video Card
Kingston HyperX 2GB x 4 (8GB total) (256M x 64-bit, DDR2-800, PC2-6400,CL5, 240-Pin, SDRAM, 5-5-5-15 @ 1.85v)
Noctua NH-D14

Overclock-related BIOS settings:
AI Tweaker:
AI Overclock tuner:................................MANUAL
CPU Ratio Setting:..................................10
FSB Frequency:......................................420
PCI-E Frequency:...................................101
DRAM Frequency:..................................AUTO
DRAM CLK Skew on Channel A1:.........AUTO
DRAM CLK Skew on Channel A2:.........AUTO
DRAM CLK Skew on Channel B1:.........AUTO
DRAM CLK Skew on Channel B2:.........AUTO
DRAM Timing Control:............................AUTO
DRAM Static Read Control:..................Disabled
DRAM Read Training:............................Disabled
MEM. OC Charger:................................Enabled
AI Clock Twister:......................................Light
AI Transaction Booster:...........................Manual
Common Performance Level:...............10
Pull-In of CHA PH1:..................................Enabled
Pull-In of CHA PH2:..................................Enabled
Pull-In of CHA PH3:..................................Enabled
Pull-In of CHA PH4:..................................Enabled
Pull-In of CHB PH1:..................................Enabled
Pull-In of CHB PH2:..................................Enabled
Pull-In of CHB PH3:..................................Enabled
Pull-In of CHB PH4:..................................Enabled

CPU Voltage:...........................................1.3
CPU GTL Voltage Reference (0/2):........AUTO
CPU GTL Voltage Reference (1/3):........AUTO
CPU PLL Voltage:.....................................1.54
FSB Termination Voltage:........................1.28
DRAM Voltage:........................................2.00
NB Voltage:..............................................1.26
NB GTL Reference:...................................AUTO
SBridge Voltage:......................................AUTO
PCIE SATA Voltage:..................................AUTO
Load Line Calibration:............................Disabled
CPU Spread Spectrum:...........................Disabled
PCIE Spread Spectrum:...........................Disabled
CPU Clock Skew:......................................Normal
NB Clock Skew:.........................................Normal
CPU Margin Enhancement:....................Performance Mode

Advance CPU Settings
CPU Ratio Setting:....................................Manual
C1E Suppport:..........................................Disabled
Max CPUID Value Limit:...........................Disabled
Intel® Virtualization Tech:........................Disabled
CPU TM Function:.....................................Disabled
Execute Disable Bit:.................................Disabled

Thank you, in advance.
a b à CPUs
a b K Overclocking
November 1, 2011 12:48:02 PM

You can try a little more voltage on the NB. Just try to keep everything cool if all possible. Anything under 1.4 should be plenty safe for the NB as long as kept cool.
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November 1, 2011 2:06:04 PM

Enable the load line calibration , it may fix the problem 50% .
under 75 degree is OK for your chip and under 1.34 for vcore (cpu voltage) is safe too.
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November 2, 2011 3:34:51 AM

Thank you for the advice. I increased the vcore twice and finally had both workers of the Prime95 test continue successfully for over 8 hours. The vcore is now at 1.34375 The memory also passed the Memtest86+ passes with no errors. Unfortunately, the computer seems to still be creeping along compared to the E8600 unit that is not clocked. I decided to overclock one machine as it is the one I use the most and even relatively minor tasks seem to max the cpu. The overclock has not addressed the situation. Is there a way to measure/compare the actual processing speed of the two E8600 cpus? One system is much faster than the other in processing the same programs. If neither the cpu or memory are defective, what are the likely culprits? Again, the systems are almost identical in terms of hardware.
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