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Need Help Stabilizing my i5-2550k on a Sabertooth Z77

post #1 of 8
Thread Starter 
Settings:
CPU Current Capability - 140%
Phase and Duty Control - Extreme
EPU Power saving - Disabled
VRM Frequency - Manual - 350
C1E, C3, C6 - Disabled
LLC - Ultra High
BCLK - 100.52MHz (throughout the bulk of my testing. This was stock.)
Started with 1.8V PLL

Now, you're going to look at my progression and say, "Just add more voltage." My point of confusion/frustration is that I add about 400mV over the course of the testing and still get the same relative stability performance. At the beginning of testing, I thought each time I added more Vcore, that it would be stable because of the amount of time P95 runs without BSOD/crashing.

Testing Progression:
1.295V Bios (1.304V max load), 45x multi,
Error - BSOD in SC2 after several hours

1.3V Bios (1.304V steady max load), 45x multi
Error - BSOD 124 error after 2 hours of P95

Added PLL OV
4th core stopped after 3.3 hours of P95

Bumped Vcore
1.305V, 45x, pll ov
No error, 3 hour P95 no crashes

Updated BIOS
1.3V Bios, High LLC (Bios update lowered LLC added voltage so 1.3V was same effective load voltage as 1.305V Ultra High before), 45x
Error - BSOD after a few hours of P95

1.295V bios, Ultra High LLC, 1.304V load
Error - Fourth core died after 1 hour 15 mins.

1.3V bios, Ultra High LLC, 1.312V load
Error - BSOD in 1 min of P95

1.305V bios, UH LLC, 1.312-1.32 load (gradually bounced around)
Error - BSOD after 2.5 hours

Lowered PLL to 1.7V
1.305V bios, UHLLC, 1.312 load
Error - fourth core stopped after 3 hours, rest passed 9 hours

1.31V bios, UHLLC, 1.32V load, 1.7V PLL
Error - 101 BSOD after 1 hour, something about a clock on a secondary processor

1.315V bios, UHLLC, 1.328V load, 1.7V PLL
Error - same 101 BSOD after 2 hours, again about clock on secondary processor


Is this normal? It seems like each attempt is so close to stability seeing as how it takes hours of P95 to crash that I shouldn't have to be adding more and more Vcore but I am. I realize that I still have a pretty good chip based on these numbers, but I'd appreciate anyone's thoughts.

Thanks.
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post #2 of 8
Heres the issue Tinate, your starting with say 1.30v on cpu voltage, 1.80v pll, and failing in tests. Then you add more cpu voltage which is good, and fail more tests. Then on your next step your lowering voltage but adding pll voltage, then on the test after that you lower pll voltage and add cpu voltage....its like going 1 step forward then 2 steps back.

Heres what you do, start with certain amount cpu voltage and increase just that in testing, dont start touching other voltages. Then once you found your stable point, you try lower say pll voltage until it becomes unstable. Then once you found your lowest pll voltage, try lowering cpu voltage.

Have a look at the 2500k overclocking guide in my sig, its quite simple and best of all effective. It will help you get your cpu overclocked. Remember to write down all your settings as you progress.
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post #3 of 8
Thread Starter 
Silent,

Thanks for your reply.

I added PLL OV but never specifically raised the voltage. I guess I'm not exactly sure what that 'feature' does. Also, I didn't add Vcore at the same time that I lowered PLL voltage as that creates uncertainty. But yes I see what you're saying.

Is it normal to be so close to stability and have to add so much to vcore? Or am I actually not as close as I think?
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post #4 of 8
Yeah these cpus have a wall, wheres they start needing relatively large amounts of voltage increase to remain stable. This usually happens after 4.7ghz. Say you might need 1.30v for 4.6ghz, but then need 1.40 for 4.7ghz.
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post #5 of 8
Thread Starter 
I've disabled PLL OV, and I'm 9 hours P95 stable at 1.328Vcore at this point. I'm going to let it run until I get home, and back down the voltage to make sure that is my breaking point.

Then it's on to try to hit 5GHz biggrin.gif
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post #6 of 8
nicely done. If you find your system no longer boots (usually happens after 4.5ghz) turn CPU PLL OVERVOLTAGE on.
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post #7 of 8
Thread Starter 
Quote:
Originally Posted by $ilent View Post

nicely done. If you find your system no longer boots (usually happens after 4.5ghz) turn CPU PLL OVERVOLTAGE on.

That brings up a side question. Is there any advantage to OCing in the BIOS vs ASUS Tweak Utility? I find it extremely convenient to test using the Tweak utility vs rebooting every time to test new settings.
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post #8 of 8
I see you have no mention of memcontroller voltage..which IMO ...is set too low by default..(1.05?)
I set cpu pll @ 1.835 and vccio @ 1.11-1.14

enable eist +c1,c3,c6
Quote:
Originally Posted by tinate View Post

That brings up a side question. Is there any advantage to OCing in the BIOS vs ASUS Tweak Utility? I find it extremely convenient to test using the Tweak utility vs rebooting every time to test new settings.

Yes..tweaking in the BIOS won't scuttle your OS rolleyes.gif It'll just refuse to boot vs..erroring while OS is running and corrupting data.
Umm..I'd enable pll overvoltage..and set the amount manually to .012 ..I wouldn't leave it on auto..it'll volt your cpu to death!
Edited by Schmuckley - 4/11/12 at 6:51am
 
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Thuban Powah!
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