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Sandy Bridge owners, take note

post #1 of 185
Thread Starter 
As we're all new to these chips, and probably following one of the 4-5 guides out there on overclocking them, I figured I'd share something I've found to help stability and really helped me get my prime stable voltage down.

Lowering cpu pll down to 1.76-1.74 from 1.8 helped me out SUBSTANTIALLY!! Don't confuse this with internal cpu pll overvoltage, as I still have that on, but lowering the actual cpu pll voltage helped me out a bunch, dropped .03v off of my vcore needed for stability, and knocked 2c off max temps after 1hr prime. Your mileage may very, but thought if it only helped one of you, well then it was worth the time to write.

UPDATE I've been told intel spec is 1.71-1.89, so I'm putting mine at 1.72v to be safe, although I did have it down to 1.6v with stability.
Edited by Jonesey I7 - 1/23/11 at 8:00am
    
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post #2 of 185
Quote:
Originally Posted by Jonesey I7 View Post
As we're all new to these chips, and probably following one of the 4-5 guides out there on overclocking them, I figured I'd share something I've found to help stability and really helped me get my prime stable voltage down.

Lowering cpu pll down to 1.76-1.74 from 1.8 helped me out SUBSTANTIALLY!! Don't confuse this with internal cpu pll overvoltage, as I still have that on, but lowering the actual cpu pll voltage helped me out a bunch, dropped .03v off of my vcore needed for stability, and knocked 2c off max temps after 1hr prime. Your mileage may very, but thought if it only helped one of you, well then it was worth the time to write.
This is very interesting. I wonder why that helps?
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post #3 of 185
Quote:
Originally Posted by AtomicFrost View Post
This is very interesting. I wonder why that helps?
I'd like to know too... but I'm far more interested in how much it helps rather than why.

Looks like it's time for some more BIOS meddling...
    
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post #4 of 185
Thread Starter 
Have no idea why or how it works, I just know that it DOES help me. For 4.8ghz stable on this chip, it was taking me 1.42v under load. With it lowered, it only takes 1.39v under load, 1 1/2hr prime stable.

I originally started with a much higher pll than stock like it was for my i7 920. I started at 1.88, and went through so many stability issues. Out of pure luck, I lowered this by accident back down to stock and suddenly I was more stable. Went into bios to see what I changed, and it ended up being this voltage. I then lowered it past stock, and was COMPLETELY stable. For me, 1.76 is the sweet spot. It was better than 1.8 at 1.74, but not as good as 1.76.
Edited by Jonesey I7 - 1/16/11 at 8:48pm
    
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post #5 of 185
it's the same for 1156 apparently, seen a lot of people say lowering PLL may help a little.
post #6 of 185
As it was for the 1366 as well. I usually save it for last to see if it helps, I'm thinking I'll get on it now instead. Good call there Jonesey.
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post #7 of 185
Jonesey, I haven't tried this yet, but you already deserve massive reps. Here's one from me
    
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post #8 of 185
Im testing this out ri ght now, ive been flirting with stability all day with mine. I just wish i had a better cooler. This venx hits 70 on 1.34v. Nothing helps. Remounted like 10 times.

Til i plan out some water im just gonna keep running it with the window slightly cracked to bring my ambient down a few degrees
    
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post #9 of 185
Will try this out definitely.

Also, should load line calibration set to ultra high or extreme? I followed a newegg youtube overclocking steps and had it set to ultra high ever since.
    
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post #10 of 185
Thread Starter 
HOLY CRAP!! The service pack really does make a biggggggg difference too. Not just in linx where I now get 120 gflops, but the next thing I have certainly noticed is boot times. Before the sp, when starting windows came up the four colors would make their swirl and as soon as they touched, I'd be in. NNNOOOWWW I don't even see the colors at all!!!! Just starting windows for approx 1.5secs and BOOM, loaded. This avx instruction set in miraculous.
    
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