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Sandy bridge CPU PLL voltage and PCH voltage question: increase for stability?

post #1 of 5
Thread Starter 
Okay, I have been having trouble getting over 4.6 stable. About the only thing I havent messed with was PLL voltage and PCH voltage. PLL defaults to 1.79 in my bios, and PCH is 1.05 I believe. Can increasing either of these create stability at those overclocks? At 4.6 I use a -.005 offset and load at 1.36v.

CPU current capability 130
LLC extreme
VRM fixed freq 350
VCCIO 1.14 (ram overclocked from 1600 to 1866 at 1.35v)

Any thoughts? Would the short/long duration power limit have any effect (currently at 250 for both)

I have tested as high as 4.8 on voltage as much as 1.41 under load, but again its hit or miss which makes me think something other than vcore is to blame.

edit: just figured out what PCH is...I read that some people say increasing it to 1.2 for high multi's or sli rigs adds stability, especially in random driver crashes. I will occasionally get the "get device removed error" when playing bf3 on the latest drivers, I wonder if that will help?
Edited by guitarmageddon88 - 3/12/12 at 3:54pm
post #2 of 5
There's no need to change PCH or PLL voltages unless you're going for max clock frequency or messing with BCLK. Increase vcore to make it stable if it's not. And since you have your memory running as high as 1866 MHz, higher VCCIO may be required.
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by Alepale View Post

There's no need to change PCH or PLL voltages unless you're going for max clock frequency or messing with BCLK. Increase vcore to make it stable if it's not. And since you have your memory running as high as 1866 MHz, higher VCCIO may be required.

You think that more VCCIO is needed even though the ram overclock is staying constant through all the stages of cpu overclocking? If 1.14 vccio works for 4.5 and 4.6, shouldn't it work for all speeds and be unaffected by frequency, or am I wrong?
post #4 of 5
How does instability show? Are you getting BSOD or rounding errors in Prime95?
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post #5 of 5

Can you write down the BSOD you're getting? ie. 0x1C etc.

 
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≡ Snowbaru ≡
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Core i7 3930K 4.9Ghz Asus Sabertooth X79 EVGA GTX TITAN 1250Mhz KPE/Hybrid BIOS (SOLD) NVIDIA Geforce GTX 1080 Ti Founder Edition 
RAMHard DriveHard DriveHard Drive
32GB Samsung 30nm 2400Mhz OCZ Vertex 4 Samsung 850 EVO 13000GB HDDs 
CoolingOSMonitorKeyboard
EKWB Custom Watercooling, XSPC, Bitpower, Primo... Windows 10 Pro x64 (1607) ASUS PG278Q G-SYNC (2560x1440) Logitech G910 Onion Spark 
PowerCaseMouseMouse Pad
EVGA SuperNOVA 850G2 Gold Fractal Design Define S Logitech G502 Logitech G440 
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