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Trying to stabilize overclock, confused what's causing instability (2500K, Asrock Extreme3 Gen3) - Page 3

post #21 of 129
@ kazzjohnson

Are you using offset or fixed btw? With offset I found changing LLC changed the voltages, and I needed to manipulate offsets to regain stability, not sure if it's the same with fixed mode.

Btw, you should be able to use offset at that multi so your vcore can respond to load, and not run at full at the time. Also, I found with the same mobo that I didnt need to change LLC from 5 until I was going x46 and higher.

If it helps, i needed offset +0.005 cpu-z vcore 1.288 to get x44 stable 19hrs p95, with LLC=5.

I suggest: put offset to +0.005, leave LLC=5, and see how high you can take the multi with stability through your chosen program. You'll get more than x42 and your vcore will still be less than 1.3 for you temps/longevity.
    
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post #22 of 129
Thread Starter 
Yesterday I set LLC to level 2, Vcore to 1.285V and RAM profile to XMP (I had it set to regular 1600MHz before) and finished 21 passes in LinX (problem size 27500 which is nearly 6GB of RAM) in 90 minutes without any errors. So I guess that's step in right direction. smile.gif Other settings were as before (disabled spread spectrum and energy saving, 250/250 power limits, 250 core current limit). Hottest core was 59-60 °C, average across all 4 cores was around 55 °C.

I'd like to play with offset mode if I can figure out how it actually works.
Quote:
Originally Posted by esCob4r View Post

I am using a 2550K on a P8Z68-V Gen3 board and all I changed was my Vcore and Multiplier. Currently running 4.5ghz @ 1.265Vcore. I am sure you should be able to obtain about the same with a 2500K. Also manually set your ram. Use the default timing and voltage but set them manually so the overclock doesn't try to adjust your memory.


I would also try doing what your doing with the GPU you had previously installed and see if the problem continues. Any changes can make an overclock unstable if I am not mistaken.
4.5GHz @ 1.265V Vcore, that's very nice... I seriously doubt my chip could achieve that, sadly.

My previous GPU was no GPU. smile.gif I used integrated graphics until I bought HD 7850.
Quote:
Originally Posted by BabyModR View Post

@ kazzjohnson

Are you using offset or fixed btw? With offset I found changing LLC changed the voltages, and I needed to manipulate offsets to regain stability, not sure if it's the same with fixed mode.

Btw, you should be able to use offset at that multi so your vcore can respond to load, and not run at full at the time. Also, I found with the same mobo that I didnt need to change LLC from 5 until I was going x46 and higher.

If it helps, i needed offset +0.005 cpu-z vcore 1.288 to get x44 stable 19hrs p95, with LLC=5.

I suggest: put offset to +0.005, leave LLC=5, and see how high you can take the multi with stability through your chosen program. You'll get more than x42 and your vcore will still be less than 1.3 for you temps/longevity.
I'm using fixed. Honestly, I haven't figured out how offset works yet. Care to explain? From what I understand, it works better than fixed Vcore, but takes more time/tries to get it right.
Quote:
Originally Posted by casp1887 View Post

You are right do not go with LLC one, go with either 2 or 3.

Try to enable Internal PLL Overvoltage if you haven't done that already.

You can also try with 1.4 vCore to make sure that you've got a vCore problem and not something else.
What does internal PLL overvoltage do, exactly? From what I understand, it's needed only for higher overclocks and also disables possibility to wake up from sleep, right?
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post #23 of 129
Thread Starter 
I read a bit about offset Vcore and looks like it's based on difference between VID and Vcore. But is that difference on stock settings or overclocked.

On stock settings, I get:

Load Vcore: 1.160 - 1.168
Load VID: 1.246

Idle Vcore: 0.952 - 0.984
Idle VID: 1.1659 - 1.1909

So should I use offset -0.086 or -0.078 or something else?
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post #24 of 129
Internal PLL Overvoltage is needed for higher overclocks, but 4.2 is "high" for some chips which means that it could help.

And yes it can cause problems with sleep mode.
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post #25 of 129
post #26 of 129
Thread Starter 
Thanks for the link. smile.gif

After doing some more research and reading up on offset Vcore, I finally tried to put theory into practice.

I have to admit I'm still a bit confused about determining offset Vcore, but I figured it has something to do with difference between VID and Vcore, I'm just not sure in which condition should I read VID and Vcore so I improvised a little.

I tried using -0.085, -0.075, -0.065 and -0.055 offset and they all ended up with similar Vcore in CPU-Z which apparently wasn't high enough and resulted in single worker stopping in Prime95 after <5 minutes.

Then I lowered (or increased?) offset to -0.015 and got stable 10 minute Prime95 run. CPU-Z says my Vcore was between 1.248 and 1.264. Is this good for 4.3 GHz?

Tomorrow I'm going to test it in LinX for 20 runs or 1 hour to see how stable it really is.

Also, where do I go from here to further stabilize this overclock and lower voltage/temperature? Of course, under the condition it passes 20 runs in LinX... Setting LLC from level 5 to level 2/3/4? Setting offset to -0.020? Or something else?

Here are all relevant settings:

CPU Ratio Setting - Manual
Max Ratio - 43
Internal PLL Overvoltage - Disabled
Intel SpeedStep Technology - Enabled
Turbo Boost Power Limit - Manual
Short Duration Power Limit (W) - 250
Long Duration Power Limit (W) - 250
Long Duration Maintained (Sec.) - 1
Additional Turbo Voltage - Auto
Core Current Limit - 250
Host Clock Override (BCLK) - 100.0 MHz
Spread Cpectrum - Disabled
Power Saving Mode - Disabled
CPU Core Voltage - Offset Mode
Offset Voltage - -0.015
CPU Load-Line Calibration - Level 5
Active Processor Cores - All
Hardware Prefetcher - Enabled
Adjacent Cache Line Prefetcher - Enabled
Enhanced halt state (C1E) - Enabled
CPU C3 State Support - Disabled
CPU C6 State Support - Disabled
Package C State Support - Auto
CPU Thermal Throttling - Enabled
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post #27 of 129
Your voltages seems to be around what the average of cpu's are running at your speed.

The "normal" voltage at 4.5GHz is 1.28v-1.30v.
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post #28 of 129
Thread Starter 
That's definitely good to hear. smile.gif

However, there's one more thing that concerns me... Temperatures seem to be a few degrees higher using offset mode even on a bit lower voltage than when using fixed mode. How so?
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post #29 of 129
I'm not sure about that, and I can't test it as I'm waiting to get my mobo back from RMA.
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post #30 of 129
Thread Starter 
I am very glad to report that my overclock is stable! smile.gif 21 passes in LinX using problem size 27500 (nearly 6 GB of RAM) which took a bit under 90 minutes.

Vcore reported by CPU-Z was between 1.248 and 1.264.

Now, what's the next step? Increasing offset to negative side (from -0.015 to -0.020) in order to reduce voltage or reduce LLC level (from current level 5)?

Oh, and as for temperatures, I think I have an explanation why they increased. I don't think offset mode is to blame because there was a sudden increase in ambient temperature in my area, last few days very quite hot and temperature in my PC case is few °C higher than before. Delta temperature probably remained the same, but ambient temperature increased so final temperature increased as well.
Edited by kazzjohnson - 4/30/12 at 9:54am
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