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After stable overclock enabling C state results in crash

post #1 of 6
Thread Starter 
So I have a i7 965 EE which is overclocked to 4GHz with 29x138MHz
It's stable for 1 hour prime95 without C-state but when I enable C state technology in BIOS it'll boot and crash immediately after logging in.
I kinda want this feature turned on because I browse a lot and that doesnt require all cores to be on 4GHz.
I am able to enable speedstep but that doesnt change anything, no undervolt no underclock nothing, I guess speedstep only works in combination with C state

U guys have any idea where this instability comes from?
They say it's better to disable while overclocking because it'll cause instabilities.And you can turn it on after, but if I do this it'll just crash.
What should be increased to fix this?
Edited by runeazn - 9/22/13 at 11:24am
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Ryu's Den :3
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Ryu's Den
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CPUMotherboardGraphicsGraphics
Intel i7 965 Extreme Edition Asus P6T6 WS Workstation XFX 6850 Asus 6850 
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Muskin Copperhead WD RE-4GP  WD Raptor Adata S596  
Optical DriveCoolingOSMonitor
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post #2 of 6
I have a feeling that the C state technology reduces the amount of voltage provided to the CPU, causing your overclocking to become unstable.

I honestly just say leave C states off if you want to maintain your overclock constantly, unless you want to alter your overclock.

(im an novice to overclocking my self, so this is my guestimation)
Edited by DavePC - 9/29/13 at 6:05pm
post #3 of 6
Thread Starter 
Erhmm maybe i said it wrong but what I mean was:
C-state enabled? : boots logs in but doing something results in crash
C state disabled : boots and works fine 1h prime
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Ryu's Den :3
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Optical DriveCoolingOSMonitor
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i7 965 Of DOOM @ 3.33Ghz 1.17V P6T6 WS Revolution EVGA GTX 275 1792MB Voltmodded Mushkin Copperhead 1600Mhz 
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post #4 of 6
You need to increase the vcore, on my 970 it needs to be increased by around 0.03v
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post #5 of 6
In the Core i7-920, the final multiplier depended on if you had C3 or C6 enabled. The default multiplier for these CPUs is 20. With the C States disabled, the maximum amount of turbo boost was a +1 increase so the maximum multiplier was 21. What many people don't realize is that if C3 or C6 is enabled, this would unlock the 22 turbo multiplier but this only kicks in when a single core is active. I saw some users with a 100% stable overclock of 200 MHz x 21 = 4200 MHz and then when they would enable the C States, this would increase the 1 core turbo multiplier to 22 so all of a sudden they were trying to boot up and their CPU was running at 4400 MHz instead of the 4200 MHz that they thought they were running at.

The EE CPUs should let you have better control of this as long as the bios is set up correctly. Reduce your multiplier when testing this theory out.

You can use ThrottleStop 6.00 and click on the TRL button to make sure your turbo ratios / multipliers are all set equally after you boot up into Windows.

ThrottleStop 6.00
http://www.thedigitalhq.com/downloads/
Edited by unclewebb - 10/6/13 at 10:42am
post #6 of 6
oops I meant off.
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