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post #1521 of 6378
Quote:
Originally Posted by buffalofloyd View Post
I have the same memory as you and I have seen that first BSOD more times than I care to remember. I don't know much about this overclocking stuff so trying to lower the timings of my RAM has been a nightmare. I have resorted to leaving the timings on auto with a QPI/DRAM of 1.26875. This sets my timings to 9-9-9-24 and I seem to be fairly stable. I don't know how to get them any lower than that. I have been able to leave the voltage at 1.26875 and manually set the timings to 8-8-8-24 with limited success. Prime95 runs fine and so does OCCT but I fail the IBT and LinX. I'm sure somebody with more knowledge could get my timings lower. I don't know if any of this helps or not.
Have you managed to get your timings to 8-8-8-24? Take a look at my OC settings for 3.8Ghz, 4.0Ghz and 4.2Ghz and see if that helps. I don't know what BCLK and BCLK Frequency you are using for your OC @4.2Ghz. I have found that 200 x 21 requires lower voltages both for VCore as well as for QPI/DRAM.

These are my settings, I hope this helps:
    
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post #1522 of 6378
Quote:
Originally Posted by perkeo View Post
Have you managed to get your timings to 8-8-8-24? Take a look at my OC settings for 3.8Ghz, 4.0Ghz and 4.2Ghz and see if that helps. I don't know what BCLK and BCLK Frequency you are using for your OC @4.2Ghz. I have found that 200 x 21 requires lower voltages both for VCore as well as for QPI/DRAM.

These are my settings, I hope this helps:
This is my exact setup, I think I will try your settings to get 4.0ghz.

What are acceptable temps?
post #1523 of 6378
Quote:
Originally Posted by perkeo View Post
I have managed to OC my i7 930 D0 in P6X58D Premium @ 3.8Ghz, 4.0Ghz and 4.2Ghz using BCLK 200 (x19, x20 and x21) but the voltages at which I managed to get stable are way higher than those posted by xmisery and others. What is the reason for my CPU to need a higher voltage for the same level of OC?
My CPU Batch is 3001A501, I wonder if that matters. What do you reckon?
I would like to try OC'ing my CPU further but at these vCore voltage levels I just don't feel comfortable doing that.
Any help in getting my OC to run at lower voltages (VCore and QPI/DRAM) or comments from anyone with the same CPU would be much appreciated.
Couple things I notice:

1. You need a larger increase in Vcore to go from 3.8>4 then you do from 4>4.2; that means something isn't right at 4.0. I'd suggest reconfiguring your 4.0 overclock using the 21x multiplier at bclk 191. Do this and I bet you will be able to lower your Vcore to the 1.3 - 1.325v range. The slight underclock of your RAM is irrelevant. Others have stated, and it has been true with my experimentation, that the 20x multiplier is inherently less stable than the 19x or 21x. As for why that is, I still haven't seen an explanation that I buy but for whatever reason it seems to be true.

2. You can destabilize your overclock by manipulating the IOH, ICH, CPU diff amplitude, and skews. Try IOH and ICH on 'auto' (or manual=1.1), CPU diff ampitude on 'auto' or 700mv, and both clock skews to 'normal'. I am running 8800 Ultra SLI (almost as power hungry as the Fermi) and only when I was trying 4.3 & 4.4 overclocks did I have to raise IOH - only one or two of my three DIMMs would be detected at 1.1v. If all your memory is accounted for and you are not getting GPU-related errors, you may be most stable at 1.1v. ICH is the southbridge which is pretty far downstream from the components stressed that overclocking stresses... have yet to see a good explanation on why increasing this will do anything other than increase heat. As for CPU differential amplitude and clock skew... well I've played with them and cannot say they have ever helped stabilize and unstable overclock.

3. You can also try overclock settings with LLC disabled. You will of course need to set higher Vcore settings in BIOS (about +0.04-0.06 at 1.2x volts, +0.06-0.08v at 1.3x volts) than with it enabled. I use it and like it bult really it is a solution for a problem that doesn't really exist, and it does add stress to the system. But it is nice to see the lower Vcore setting in the BIOS and Turbo-V With it disabled, find the lowest Vcore at full load that is stable. Then if you want, enable it and see if that value will still work. You need to run LinX with at least 5,120mb RAM to get the maximum Vdroop! Any less doesn't fully stress compute cores and IMC at the same time.

4. You can try overclocking with power saving features (EIST, C1E, Vcore offset) enabled. While this probably won't help stability, on the P6X58D it doesn't seem to hurt it either. If you can use the same load Vcore and get drastically lower idle Vcore, why not ?
Edited by ekovalsky - 4/2/10 at 5:09pm
post #1524 of 6378
Quote:
Originally Posted by perkeo View Post
Have you managed to get your timings to 8-8-8-24? Take a look at my OC settings for 3.8Ghz, 4.0Ghz and 4.2Ghz and see if that helps. I don't know what BCLK and BCLK Frequency you are using for your OC @4.2Ghz. I have found that 200 x 21 requires lower voltages both for VCore as well as for QPI/DRAM.

These are my settings, I hope this helps:
I used xmisery's settings for the 4.20GHz OC except I have fooled around a tad with a couple things. My CPU voltage is 1.29375 and my QPI is 1.25000. The settings for my RAM at these voltages are left on auto which runs my ram at 9-9-9-24. This has been stable so far as I can tell.

In trying to lower my RAM timings I was fooling around looking at the XMP profile and when I loaded the profile the QPI was at 1.35000 running the timings at 8-8-8-24-2N. So essentially I thought that if I just raise up the QPI to 1.35000 like the XMP profile did that I could manually set my timings to 8-8-8-24-2N which so far seems to be the case. I haven't done any lengthy testing in LinX, OCCT, IBT, or Prime95 yet but so far it seems stable. I noticed that this voltage is somewhat higher than what I see for other peoples so I am thinking it's prolly not good.

I did try manually running my RAM at 8-8-8-24-auto with the voltage at 1.25000 like you but I remember failing LinX and IBT I think so I gave up with that. I have kind of given up trying to get timings for my RAM lower and personally I don't think I would notice an improvement or not from the auto settings. What do you think?
post #1525 of 6378
Just tried xmisery's 3.61GHz w/ Hyperthreading settings and got a BSOD after about 5 mins with no load. Should I increase the CPU Voltage? Is there anything else to increase?

I didn't catch the BSOD message as it disappeared too fast, how do I prevent a reboot on BSOD?
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post #1526 of 6378
Quote:
Originally Posted by paleblue View Post
Just tried xmisery's 3.61GHz w/ Hyperthreading settings and got a BSOD after about 5 mins with no load. Should I increase the CPU Voltage? Is there anything else to increase?

I didn't catch the BSOD message as it disappeared too fast, how do I prevent a reboot on BSOD?
Maybe because you run a i7 930 you may need more voltage? I am not sure but it sounds good. To stop your computer from rebooting you will want to go to..

Control Panel\\System and Security\\System\\Advanced System Settings\\Startup and Recovery

Then you will want to uncheck "automatically restart". I needed help on this very problem a little while back as well
Edited by buffalofloyd - 4/2/10 at 7:00pm
post #1527 of 6378
Quote:
Originally Posted by buffalofloyd View Post
Maybe because you run a i7 930 you may need more voltage? I am not sure but it sounds good. To stop your computer from rebooting you will want to go to..

Control Panel\\System and Security\\System\\Advanced System Settings\\Startup and Recovery

Then you will want to uncheck "automatically restart". I needed help on this very problem a little while back as well
Thank you very much - the restart is off now. I bumped the cpu voltage to 1.15 and i'm about to run a stress test, I expect it to crash!

Is there anything else I should raise other than cpu voltage? (vcore I think it is but the BIOS lists "cpu voltage" can you clarify?).
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post #1528 of 6378
Seems happy with 3.61GHz @ 1.15v initially. Now to run prime95...

Seems ok ran linx no probs but only showing 6GB ram cpuz shows 12 but BIOS and windows task manager only show 6. Any suggestions?

Edited by paleblue - 4/2/10 at 7:56pm
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post #1529 of 6378
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Originally Posted by paleblue View Post
I was just trying to load windows to run some stress tests using the 3 1TB raid 0 set - after it's all good I'll move my two SSDs over from my current machine and make them the boot volume.

Yes the problem was that such a large volume isnt bootable. I made a 70GB vol and that worked fine. The problem now is that win7 won't allow me to have a 2.7 TB vol. It splits it to a max of 2 TB. Is there a way around that? I'd like a larger volume really.
No 2TB is the max you can have its a os thing
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post #1530 of 6378
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