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Need help optimizing my OC

post #1 of 11
Thread Starter 
I'm content with a 200 x 20 4Ghz overclock, but I think my vcore (1.34) is pretty high compared to other i7 920 D0 owners. But when I bring it down the PC sometimes blue screens 10 minutes into prime95 blend test. Max temps during prime was 71C. Anything I'm not doing properly?

http://valid.canardpc.com/show_oc.php?id=1582319

My full BIOS settings from my Sabertooth board are as follows:

[EDIT] Made revisions and I've been able to get 20 runs of Linx with no errors, using a problem size of 25,000. Had to bump of the vcore a bit... before it passed prime95. Bumped QPI voltage down a bit.

OC from CPU Level Up: Auto
CPU Ratio Setting: 20
Intel SpeedStep Tech: Disabled
BCLK freq: 200
PCIE freq: 100
DRAM freq: DDR3-1603 Mhz
DRAM Timing: 9-9-9-24-1T
UCLK freq: 3208 Mhz
QPI Link Data Rate: 7218 MT/s
CPU Voltage: 1.35000
CPU PLL Voltage: 1.8
QPI/DRAM Core voltage: 1.31250
DRAM Bus Voltage: 1.50
Load-Line Calibration (Vdroop): Enabled
CPU Differential Amplitude: Auto
CPU Clock Skew: Auto
CPU Spread Spectrum: Auto
IOH Clock Skew: Auto
PCIE Spread Spectrum: Auto
C1E Support: Disabled
Hardware Prefetcher: Enabled
Adjacent Cache Line Prefetch: Enabled
MPS and ACPI MADT ordering: modern ordering
Intel Virtualization Tech: Enabled
CPU TM function: Enabled
Execute Disable Bit: Enabled
Intel HT Technology: Enabled
Active Processor Cores: All
A20M: Disabled
Intel C-State Tech: Disabled
CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled
Edited by majinwu - 1/9/11 at 6:02pm
post #2 of 11
Try going 21 * 190. The i7, for some strange reason, does not like even multipliers. And if you don't need HT, i.e. this is a gaming rig, turn it off. With HT off you could lower your voltages by probably ~.05 volts or more. Your temps will love you too with HT off.
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by PulkPull View Post
Try going 21 * 190. The i7, for some strange reason, does not like even multipliers. And if you don't need HT, i.e. this is a gaming rig, turn it off. With HT off you could lower your voltages by probably ~.05 volts or more. Your temps will love you too with HT off.
I'd rather keep HyperThreading enabled... it's a nice feature to have and disabling it basically means cutting the ability of my processor in half. I still run some video editing software on occasion.

Do I need to bump up DRAM voltage up to 1.6 even though I'm running ram at stock speed?
Can I turn Off CPU & PCIE spread spectrum, A20M, virtualization?
Edited by majinwu - 1/8/11 at 8:42am
post #4 of 11
I would run your ram at what ever volts they call for in their system specs. I tried looking just now, but G.Skill DDR3 1600 have recommended volts anywhere from 1.5 to 1.65 depending on the model. If they do require 1.65 as per specs, running them at 1.5 may be causing your crashes.
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post #5 of 11
Thread Starter 
The retail box for the ram says 1.5V
post #6 of 11
As has been mentioned, try using an odd CPU multiplier.

Also, if you can, reduce CPU PLL to 1.6-1.7v.

You shouldn't need that much QPI/VTT for ~3.2GHz uncore with that RAM. Try ~1.275v.
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by Blameless View Post
As has been mentioned, try using an odd CPU multiplier.

Also, if you can, reduce CPU PLL to 1.6-1.7v.

You shouldn't need that much QPI/VTT for ~3.2GHz uncore with that RAM. Try ~1.275v.
My mobo says 1.8v is the minimum voltage for PLL, so I think I'll stick with stock.
post #8 of 11
Quote:
Originally Posted by majinwu View Post
My mobo says 1.8v is the minimum voltage for PLL, so I think I'll stick with stock.
Why do you post on forums for advice from people who know what they are talking about, when clearly you do not, and then ignore their adivce?
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by tconroy135 View Post
Why do you post on forums for advice from people who know what they are talking about, when clearly you do not, and then ignore their adivce?
Didn't mean to offend anybody here... truthfully my motherboard doesn't allow you to set the PLL below 1.8. Seems like an ASUS design thing.
post #10 of 11
Quote:
Originally Posted by majinwu View Post
I'm content with a 200 x 20 4Ghz overclock, but I think my vcore (1.34) is pretty high compared to other i7 920 D0 owners. But when I bring it down the PC sometimes blue screens 10 minutes into prime95 blend test. Max temps during prime was 71C. Anything I'm not doing properly?

http://valid.canardpc.com/show_oc.php?id=1582319

My full BIOS settings from my Sabertooth board are as follows:

[EDIT] Made revisions and I've been able to get 20 runs of Linx with no errors, using a problem size of 25,000. Had to bump of the vcore a bit... before it passed prime95. Bumped QPI voltage down a bit.

OC from CPU Level Up: Auto
CPU Ratio Setting: 20
Intel SpeedStep Tech: Disabled
BCLK freq: 200
PCIE freq: 100
DRAM freq: DDR3-1603 Mhz
DRAM Timing: 9-9-9-24-1T
UCLK freq: 3208 Mhz
QPI Link Data Rate: 7218 MT/s
CPU Voltage: 1.35000
CPU PLL Voltage: 1.8
QPI/DRAM Core voltage: 1.31250
DRAM Bus Voltage: 1.50
Load-Line Calibration (Vdroop): Enabled
CPU Differential Amplitude: Auto
CPU Clock Skew: Auto
CPU Spread Spectrum: Auto
IOH Clock Skew: Auto
PCIE Spread Spectrum: Auto
C1E Support: Disabled
Hardware Prefetcher: Enabled
Adjacent Cache Line Prefetch: Enabled
MPS and ACPI MADT ordering: modern ordering
Intel Virtualization Tech: Enabled
CPU TM function: Enabled
Execute Disable Bit: Enabled
Intel HT Technology: Enabled
Active Processor Cores: All
A20M: Disabled
Intel C-State Tech: Disabled
CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled
Try Vqpi/dram = 1.35v
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