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980x Overclock

post #1 of 9
Thread Starter 
Hello!

First time poster here, long time reader.

I'm having difficulty overclocking my Intel i7 980x Extreme CPU. The problem is that I'm upping vcore in steps but sometimes Prime95 reports a core as having an error after say 90 minutes, then after I up vcore by 1 step the next Prime95 run reports a core as having an error after just 5 minutes. Each core temp peaks at about 91C after say 1 hour and the CPU itself never goes above 83C. Speedstep etc. is all off to maintain the 4Ghz speed, and there is no throttling either.

The base clock whilst run at 12x200 (2.4Ghz) is stable at 6 hours in Prime95 is stable at that voltage. Games NEVER crash with these settings and I play Far Cry 2, BFBC2 etc. The only thing that is not stable is Prime95.

Now everyone else's QPI/VTT is much higher than mine could that be the cause of the instability? Please see my PC specs in my sig.

My CPU is set to the following:

Multipler: 20
Base Clock: 200
Vcore: 1.2625
CPU PLL: Auto
QPI/VTT: 1.23125

My memory is set to the following:

8x200 @ 1600 6-7-7-18 1.64 voltage (uncore 3200)

Now I have run memtest86+ for almost 10 hours (12 passes) with 0 errors at those settings.

(I hope that this is the correct forum.)
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post #2 of 9
Someone will correct me if I'm wrong (I'm on Lynfield as opposed to Gulftown) But when I can't get it any more stable by raising V Core, i usually step it back to where it was when it first became unstable and instead raise the QPI voltage (vtt) This fixes it 90 percent of the time. Usually the other 10 percent is a little bit of Vcore and a bit of Vtt.

EDIT: PS Prime 95 and other programs like IBT Stress the system far more then any other standard program will. So its common to have a system stable in everything except Prime95, IBT, Linx etc
Edited by hobo9830 - 4/9/11 at 4:08am
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post #3 of 9
Thread Starter 
Thanks, but could it still be that my vcore is too low @ 1.2625, or should I still increase it until I hit something ridiculous like 1.3 and only then up QPI/VTT?
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post #4 of 9
Thread Starter 
Just upped QPI/VTT to 1.25 and again, even after 5 mins 3 cores reported errors in Prime95. ***?
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post #5 of 9
Thread Starter 
vcore @ 1.3, 5 mins in and BAM! 1 by 1 the cores fail and then Prime95 crashes.
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post #6 of 9
Try setting your:
CPU Voltage: 1.32
QPI/Dram: 1.32
CPU PLL: 1.80
IOH: 1.20
ICH: 1.20
IOH PCIE: Auto
ICH PCIE: Auto

When you changed your BCLK to 20 what did you change your QPI Link Data Rate freq to?

What is the model number of your Corsair ram?

Below are my BIOS settings for my R3E/980X, some of these may not show up in your P6X58D-E, but it will show you all the stuff I have disabled that makes for a more stable OC.

LN2 Mode: Disabled
QPI Loadline Calibration: Disabled
Sync Mode: Disabled
AI Overclock Tuner: Manual
OC From CPU Level Up: Auto
2D Performance Booster: Disabled
CPU Ratio Setting: 27
CPU Turbo Power Limit: Disabled
BLCK Frequency: 164
PCIE Frequency: 100
DRAM Frequency: DDR3 1644MHz
UCLK Frequency: 3287MHz
QPI Link Data Rate: 5919MT/s
Memory Configuration Protect: Disabled

DRAM Timing Control
1st Information :
CAS# Latency: 6
DRAM RAS# to CAS# Delay: 7
DRAM RAS# PRE Time: 6
DRAM RAS# ACT Time: 18
2nd Information :
DRAM Timing Mode: 1N
All other DRAM settings are on auto

CPU Differential Amplitude: Auto
CPU Clock Skew: Auto
IOH Clock Skew: Auto
Digi+ Pwr Mode: T-Balanced
PWM Volt. Control: Auto
Load-Line Calibration: Full Calibration
CPU Voltage OCP: Enabled
CPU PWM Frequency: Auto
Extreme OV: Disabled
Extreme OC: Auto
CPU Voltage: 1.36875
CPU PLL Voltage: 1.82850
QPI/DRAM Core Voltage: 1.36875
DRAM Bus Voltage: 1.66950
IOH Voltage (NB): 1.20575
IOH PCIE Voltage (NB): Auto (1.51)
ICH Voltage (SB): 1.20575
ICH PCIE Voltage (SB): Auto
CPU Spread Spectrum: Disabled
PCI Spread Spectrum: Disabled

Advance CPU Settings
CPU Ratio Setting: 27
C1E Suppport: Disabled
Hardware Prefetcher: Enabled
Adjacent Cache Line Prefetch: Enabled
Intel® Virtualization Tech: Disabled
CPU TM Function: Disabled
Execute Disable Bit: Disabled
Intel HT Techology: Disabled
Active Processor Cores: All
A20M: Disabled
Intel SpeedStep Tech: Disabled
Intel C-STATE Tech: Disabled

Advanced Menu: PCIPnP
PNP OS = Yes
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post #7 of 9
The 980 has unlocked multi try dropping the bclk and raising the multi instead. There's a balance between the two.
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post #8 of 9
What's your uncore at? A good number seems to be around 1.5x mem speed.

Check your QPI speed as well, try and keep it around 4.8 - 6.4 GT/s as a general rule.

Try increasing your multiplier first then BCLK. As said before it's a bit of both.

I'm currently running 30 x 143 = 4290MHz @ 1.36

Adjust mem multi accordingly.

You may need to increase your vCore, 1.26 seems low for 4GHz.

Download RealTemp and run RealTempGT for the 980x when running stress tests. Temp readings have been proven to be accurate with RealTemp.

Let us know how your going...
Edited by Mez_Oz - 4/11/11 at 6:15pm
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post #9 of 9
You can bump that QPI/VTT to 1.35 for 24/7, give it some more!

And the point of buying an extreme edition chip is that it has an unlocked multiplier. Try lowering BCLK but increase the multiplier, I find it's more stable.
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