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Overclocking i7-970 - Prime95 gives errors after ~10 hours

post #1 of 7
Thread Starter 
I am quite new to this overclocking business and I've tried a couple of different things here, when setting bckl to 167 and multiplier to 25 with standard vcore, prime95 runs for about 10 minutes and then gives some math rouding error.

But when I raise the vcore a bit stock + 0.200v ( got an MSI board that has weird vcore setup ) it works a little bit better, but what if I run Prime95 for several hours and after waking up tomorrow I notice that after 10 hours I got a math round error:

What do I do then?

Do I raise the vcore even more, or is that bckl out of the question? Could it even be a too high vcore?

One more question, I accidently got my vcore to peek at 1.4v and I know that the maximum recommended from Intel is 1.375, will my computer explode or somthing now? I turned it off as soon as I saw it.

Thanks for being patient with me guys
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post #2 of 7
Rounding errors might be uncore or memory related, so before jacking up vcore further you should try raising QPI/VTT and possibly vDIMM.

A short period above the rated voltage is unlikely to do any harm.
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post #3 of 7
Thread Starter 
Ahh, I'll try that. Is it somehow possible to determen if it's memory related faster than running prime for 10 hours? How good is memtest?
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post #4 of 7
just set your ram voltage and timings manually, you can get bsod's from not setting ddr3 settings for sure.

post your bios settings and we will sort this out for you, I have the same chip!
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post #5 of 7
Thread Starter 
Uhh I see and here I thought that it only mattered what I set the vcore offset, bckl and multiplier too. I'll update the post in a bit, thanks a lot I've got an MSI X58A-GD65 board though and the settings are a bit werd.

The voltages are afaik +/- offsets to a preset. Also I've set my multiplier to 25 but its colored Yellow, the chip is supposed to be locked at 24, so dunno why I can set 25..

Here are my bios settings:

[ Green Power Menu (Mostly information about voltages) ]

CPU Pgase Control = Auto
Icore = ~25.283 A
I12v = ~2.501 A
Vcore = 1.296 V
V12V = 12.190 V
Pout = 32.085 W
Efficiency = ~109.800 %

[ Cell Menu ]
Current Core Frequency = 4.00GHz ( 167x24 )
Current DRAM Frequency = 1002MHz
Current QPI Frequency = 4.800GT
Intel EIST = Disabled
C1E Support = Disabled
Adjust CPU Base Frequency (MHz) = 167
Adjust CPU Ration = 25 ( Yellow Color )
Adjusted CPU Frequency (MHz) = 4175

Current DRAM Channel 1 Timing = 9-9-9-24
Current DRAM Channel 2 Timing = 9-9-9-24
Current DRAM Channel 3 Timing = 9-9-9-24
DRAM Timing Mode = Auto
Extreme Memory Profile = Disabled
Memory Ratio = Auto
Adjusted DRAM Frequency (MHz) = 1002
Uncore Ratio = Auto
Adjusted Uncore Frequency (MHz) = 2004

Adjust PCI Frequency (MHz) = Auto
Adjust PCI-E Frequency (MHz) = 100
Auto Disable PCI/PCI-E Frequency = Enabled

VDroop Control = High VDroop
CPU Voltage (V) = +0.170
CPU PLL Voltage (V) = Auto
QPI Voltage (V) = Auto
DRAM Voltage (V) = Auto
DDR_VREF_CA_A (V) = Auto
DDR_VREF_CA_B (V) = Auto
DDR_VREF_CA_C (V) = Auto
DDR_VREF_DQ_A (V) = Auto
DDR_VREF_DQ_B (V) = Auto
DDR_VREF_DQ_C (V) = Auto
IOH Voltage (V) = Auto
ICH Voltage (V) = Auto

Spread Spectrum = Disabled

[ Cell Menu - QPI Configuration ]
QPI Links Speed = Full-Speed
QPI Frequency = 4.800GT

[ Cell Menu - ClockGen Tuner ]
CPU Amplitude Control = 800mV
PCI Express Amplitude Control = 800mV
CPU CLK Skew = Normal
IOH CLK Skew = Normal

[ Cell Menu - CPU Feature ]
Intel EIST = Disabled
Intel C-STATE = Enabled
C State package limit setting = Auto
C1E Support = Disabled
Overspeed Protection = Enabled
Hyper-Threading Function = Enabled
Execute Bit Support = Enabled
Set Limit CPUID MaxVal to 3 = Disabled
Intel Virtualization Tech = Enabled
Intel VT-d Teck = Disabled

Another thing, when I am in Windows and running Prime95, I watch the vcore and other stuff in CPU-Z and the VCore changes from 1.320 to 1.338 while the QPI Link changes aswell, the Bus Speed and Multiplier are the same all the time though, but the Core speed changes when the QPI/Vcore changes.
Edited by frW - 1/8/11 at 3:11pm
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post #6 of 7
looks like you need to disable C-State and then you'll be set.
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post #7 of 7
Thread Starter 
I'll try that. The computer died/froze when I had the above settings over night. I'll try the same but with c state off.

*Edit*

Seems like the QPI Link still goes up a couple of MHz and the Vcore changes a little, even when I have C-State disabled. I've also disabled CPU Phase Control in the Green Power sub-menu.

Any other suggestions? After ~3.5 hours I got FATAL ERROR: Rouding was 0.4970703125 expected less than 0.4 Hardware failure detected.
Edited by frW - 1/9/11 at 2:39am
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My System
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CPUMotherboardGraphicsRAM
Intel i7-970 @ 4GHz ASUS Rampage III Black Edition Gigabyte GTX 460 1GB SLI Corsair Vengence LP 24GB 1333Mhz 
Hard DriveOSMonitorKeyboard
OCZ Vertex 3 120GB Windows 7 Enterprise SyncMaster P2770 Microsoft Ergonomical 4000 
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CoolerMaster M850 850w Fractial Design R3 - White Steelseries IKARI Steelseries 
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