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Advice on Prime95 error

post #1 of 7
Thread Starter 
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 Intel 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 at 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

CPU-Z, Core Temp and GPU-Z snap shots attached.

Overclock-related BIOS settings:
AI Tweaker:
AI Overclock tuner:................................MANUAL
CPU Ratio Setting:..................................10
FSB Frequency:......................................42 0
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:......................................Ligh t
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:.........................................Norm al
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:.....................................Disa bled
Execute Disable Bit:.................................Disabled

Thank you, in advance.


Intel E8600
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Intel E8600
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E8600 ASUS P5Q-E LGA 775 Motherboard EVGA NVIDIA GeForce GTX 460 (Fermi) Superclocked Kingston HyperX 2GB x 4 (8GB total) DDR2-800 
Hard DriveOptical DriveOSMonitor
Western Digital Caviar Green WD20EARS 2GB x 5 LG Blu-ray GGW-H20L XP Professional x64 Dell 2209WA 
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post #2 of 7
Quote:
Originally Posted by scott103111 View Post
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 Intel 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 at 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

CPU-Z, Core Temp and GPU-Z snap shots attached.

Overclock-related BIOS settings:
AI Tweaker:
AI Overclock tuner:................................MANUAL
CPU Ratio Setting:..................................10
FSB Frequency:......................................42 0
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:......................................Ligh t
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:.........................................Norm al
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:.....................................Disa bled
Execute Disable Bit:.................................Disabled

Thank you, in advance.
In my experience, if a worker stops, you need to up the vcore. If you look at my specs, I can run P95 all day at 3.8 GHz with vcore 1.2125. However I'll get a failed worker after a few hours with vcore of 1.20625. As an alternative, you could also enable LLC at the lowest manual level. That would cut back on Vdroop while under load. Try either LLC or bump vcore one notch. If neither solves the problem, try both.
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Black Sunshine II
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Wife's Rig
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Intel Xeon x5675 B1 @ 4.0 Gigabyte GA-X58A-UD3R v.2.0 Gigabyte Radeon 460 G.SKILL Ripjaws Series 6GB (3x2GB) DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
120GB Intel 510 SSD Samsung 1TB WD LiteOn iHAS324-98 Y Cougage Tru Spirit (lapped) with Akasa Viper Pu... 
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post #3 of 7
Simplified: Increase vcore until stable for a substantial amount of time with no errors.
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post #4 of 7
^^this
post #5 of 7
Thread Starter 
Thank you for the advice. I increased the vcore twice and finally had the 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.
Intel E8600
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E8600 ASUS P5Q-E LGA 775 Motherboard EVGA NVIDIA GeForce GTX 460 (Fermi) Superclocked Kingston HyperX 2GB x 4 (8GB total) DDR2-800 
Hard DriveOptical DriveOSMonitor
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Intel E8600
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E8600 ASUS P5Q-E LGA 775 Motherboard EVGA NVIDIA GeForce GTX 460 (Fermi) Superclocked Kingston HyperX 2GB x 4 (8GB total) DDR2-800 
Hard DriveOptical DriveOSMonitor
Western Digital Caviar Green WD20EARS 2GB x 5 LG Blu-ray GGW-H20L XP Professional x64 Dell 2209WA 
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post #6 of 7
Quote:
Originally Posted by scott103111 View Post
Thank you for the advice. I increased the vcore twice and finally had the 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.
Check the simple stuff like clearing out temp files and defragmenting. Does one have a faster hard drive?
Black Sunshine II
(17 items)
 
Wife's Rig
(15 items)
 
 
CPUMotherboardGraphicsRAM
Intel Xeon x5675 B1 @ 4.0 Gigabyte GA-X58A-UD3R v.2.0 Gigabyte Radeon 460 G.SKILL Ripjaws Series 6GB (3x2GB) DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
120GB Intel 510 SSD Samsung 1TB WD LiteOn iHAS324-98 Y Cougage Tru Spirit (lapped) with Akasa Viper Pu... 
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Logitech Wireless 
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Black Sunshine II
(17 items)
 
Wife's Rig
(15 items)
 
 
CPUMotherboardGraphicsRAM
Intel Xeon x5675 B1 @ 4.0 Gigabyte GA-X58A-UD3R v.2.0 Gigabyte Radeon 460 G.SKILL Ripjaws Series 6GB (3x2GB) DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
120GB Intel 510 SSD Samsung 1TB WD LiteOn iHAS324-98 Y Cougage Tru Spirit (lapped) with Akasa Viper Pu... 
OSMonitorPowerCase
Windows 7 Ultimate 64bit Dual Asus 24 inch 1080P TN Corsair TX650 Cheapo Antec 
Mouse
Logitech Wireless 
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post #7 of 7
Thread Starter 
Sorry for the delayed response. I was called out of town. Same hard drives and RAID in both computers. Operating system on standalone disk and 4TB RAID 10 (8TG total) for primary storage. Regularly clean the systems with jv16, TuneUp, Glary Utility, CCleaner, PurgeIE and MRU Blaster. Use Revo Uninstaller for uninstalls, when possible. Windows XP 64bit Service Pack 2, Kaspersky Internet Security and Diskeeper (auto defragmentation) for both. Service settings bascially correspond to those recommended on Black Viper's site.

Is there a tool to measure processing speeds of CPUs so I can compare the CPUs in the two systems? I suppose XP could be corrupt, though I have already run scannow sfc Service Pack 2 on the slower computer. I am willing to wipe the standalone drive and do clean installs of all programs, but want to rule out a defective CPU before doing so, if possible.
Intel E8600
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E8600 ASUS P5Q-E LGA 775 Motherboard EVGA NVIDIA GeForce GTX 460 (Fermi) Superclocked Kingston HyperX 2GB x 4 (8GB total) DDR2-800 
Hard DriveOptical DriveOSMonitor
Western Digital Caviar Green WD20EARS 2GB x 5 LG Blu-ray GGW-H20L XP Professional x64 Dell 2209WA 
PowerCase
Corsair 1050W Thermaltake Spedo 
  hide details  
Reply
Intel E8600
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E8600 ASUS P5Q-E LGA 775 Motherboard EVGA NVIDIA GeForce GTX 460 (Fermi) Superclocked Kingston HyperX 2GB x 4 (8GB total) DDR2-800 
Hard DriveOptical DriveOSMonitor
Western Digital Caviar Green WD20EARS 2GB x 5 LG Blu-ray GGW-H20L XP Professional x64 Dell 2209WA 
PowerCase
Corsair 1050W Thermaltake Spedo 
  hide details  
Reply
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