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.
Originally Posted by Jonesey I7;12038273
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.
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.
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
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.
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.
Originally Posted by SovereigN7;12039313
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.
My board only has enabled or disabled. Which is fine for me, as it eliminates vdroop and vdrop only occurs by about .01v down at load, which is also perfect for me. So I would set yours for the lowest setting and set vcore accordingly to avoid massive spikes of voltage.
Currently 2 hrs into prime 95 with 4.6GHz at 1.32v. I have it set to 1.28v in the BIOS. We'll see how long this lasts... I'm liking my new hardware more and more!
Originally Posted by rmp459;12039288
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
Bro, don't sweat those temps so much AT ALL. People are confusing the max temps on these as 72c, which is soooooo far from true. The TCASE on these is 72c, not max temps. To put it into perspective, on the i7 920, tcase was 68c. And it's common knowledge that you should just keep your temps under 85c for that processor. So apply that to this.... 4c higher tcase, keep your temps 90c or under.
Originally Posted by Jonesey I7;12039325
My board only has enabled or disabled. Which is fine for me, as it eliminates vdroop and vdrop only occurs by about .01v down at load, which is also perfect for me. So I would set yours for the lowest setting and set vcore accordingly to avoid massive spikes of voltage.
Originally Posted by SovereigN7;12039351
Lowest settings as in disable or to extreme? I dont understand how LCC exactly works, but something to do with vdrop and vdroop
what are your options? like low, medium, ultra high, and extreme? If these were your options, I'd personally pick low or medium and just set my vcore a tad bit higher in bios. LLC raises your vcore under load to eliminate vdroop and vdrop. BUT, llc also has spikes that occur, that you don't see with monitoring software, as they only happen for milliseconds. Say you have your vcore set at 1.4v, and under load llc raises it to 1.42v. That's fine, but what you don't see is that for microseconds, it may raise to 1.46-1.48v. which is also ok, AS LONG AS your vcore isn't set anywhere close to the max voltage for the chip.
Originally Posted by Jonesey I7;12039347
Bro, don't sweat those temps so much AT ALL. People are confusing the max temps on these as 72c, which is soooooo far from true. The TCASE on these is 72c, not max temps. To put it into perspective, on the i7 920, tcase was 68c. And it's common knowledge that you should just keep your temps under 85c for that processor. So apply that to this.... 4c higher tcase, keep your temps 90c or under.
To add to this, Sandybridge begins throttling around 95-98C, which further facilitates the fact of how high you really can go. So I'd agree with this in saying under 85-90C is ideal temperatures for Sandybridge.
Originally Posted by Jonesey I7;12039361
what are your options? like low, medium, ultra high, and extreme? If these were your options, I'd personally pick low or medium and just set my vcore a tad bit higher in bios.
In my Cpu config tab of a p8p67, the CPU ratio is set to auto (oc'ed via the turbo multiplier) and I have the Limit CPUID Max set to Disabled with Intel virtualization Tech as well. Everything else is enabled (C1E, EIST, etc). Should those two be off?
Also, in initiate Graphic Adapter settings, is it PCI/PEG, or PEG/PCI?
Hm, testing this right now, running small ffts in Prime. Lowered CPU PLL from 1.85 to 1.75 and you are right, temps are better for me, knocked off 2-3C of max temps. Hope its stable.
I dropped the PLL to 1.76 and im currently 1h30m into small ffts @ 4.8Ghz w/ 1.37v
prior to this it was looking like 1.4v minimum for 4.8ghz so *thumbs up* should be able to tweak this.... now im just waiting on some new corsair sticks to show up.
I dropped the PLL to 1.76 and im currently 1h30m into small ffts @ 4.8Ghz w/ 1.37v
prior to this it was looking like 1.4v minimum for 4.8ghz so *thumbs up* should be able to tweak this.... now im just waiting on some new corsair sticks to show up.
Glad it worked for ya mate.
Hope more read this and it helps them too.
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