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post #2501 of 10702
but when mine sometimes bsod's after 30 seconds of testing, how can i call that stable? yet i'll reboot and the same settings will run fine for 15 minutes
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post #2502 of 10702
Thread Starter 
Quote:
Originally Posted by Roksonixx View Post
but when mine sometimes bsod's after 30 seconds of testing, how can i call that stable? yet i'll reboot and the same settings will run fine for 15 minutes
that's probably what you could call, background processes interferring.

These are my tips:



**If your sandybridge is giving you problems under light load or idle, then try disabling c3/c6, this usually applies to offset users. A handful of users' have reported that even after priming 12hrs+ they have recieved random bsods, this does not really indicate that it's unstable. The error codes are not 100% and are not ALWAYS correct, with that said, stress testing in your main OS is not a good idea. If possible get yourself a spare HDD and load up windows and run all your stress testing on that. The idea of having another HDD is so that when your running your stress testing, background processes are at a minimum and should help indicate the main source of bsods, disabling the internet connection is also a good idea, same with any type of antivirus. Just remeber too many bsods in a OS can cause the OS to become unstable ie corrupted file systems etc. With that said, if you pass 12hrs once you should be able to pass again, however, this does not mean go OCD stress testing.

In a situation where you are getting random bsods or unknown stability issues try the following:
  • Clear CMOS (quick way - take the baterry out), load saved stable overclock, fresh windows install with pretty much nothing installed, no internet connection, nothing just a prime blend run. With minimum processes running and windows services, it would ba clear indication of stability without other 'things' such as a driver error, windows update, internet connection causing bsod.

  • You could try the above or even a BIOS update, I stress that before you update, run stock setttings and then update the BIOS (**Don't update the BIOS on an overclock setting, you could risk bricking the mobo)

  • Try Enabling all power saving features - C1E, EIST C3 and C6.

  • Try running C3 and C6 on AUTO with C1E and EIST Enabled.

  • Many have found that enabling SPREAD SPECTRUM reduces the voltage fluctuation.

  • Try using Manual voltage instead of Offset.

  • Go to control Panel/hardware and sound/power options and select High performance Mode.

  • Take the RAM out of the equation, underclock it if you have to and see whether or not it continues.

  • Try a fresh OS install on a spare HDD or something, remember as explained before, too many bsods in the os = corrupt file system = unstable OS

  • IF you have an SSD Read THIS, it might help solve your problems.



Hopefully some of these TIPS could help you against the dreaded IDLE/RANDOM BSOD and get your CPU stable. I'll add some more TIPS along the way.



try the fresh os install.
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post #2503 of 10702
My 4.8:

















I posted my 4.7 first because it is my 24/7 OC. 4.8 is still under development
Edited by cba1986 - 8/11/11 at 4:13pm
post #2504 of 10702
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Thanks bud, added
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post #2505 of 10702
Munaim1 I have a question.

Regarding a full shutdown/bsod vs having a worker fail, or "not passing" a computational stress test - I understand one is a more catastrophic failure than the other, but is there anything we can take away from if a worker fails? Is it an indicator of CPU PLL or VTT voltages (or something else possible), or is it just simply a general "voltage" issue and not an indicator of anything in particular.

I have not yet in my overclocking experience with SB had a worker fail. It's always a BSOD for me, and I've been very curious about this. Was there anything note worthy about changing CPU PLL for those you've been helping, besides just generally getting more/less stable?

EDIT: so wait you want screenshots of our BIOS settings? is that for people that have already proven stability?

EDIT2: Also fuloran1, please keep us updated on things that have been happening, if you have the time to. I'm really wondering about that, because it seems you've had a lot of trouble and not much success trying various things. Did you try Offset voltage yet?
Edited by donkrx - 8/11/11 at 4:39pm
    
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post #2506 of 10702
you know, coming home and opening OCN and going to this thread is starting to feel like going to a local bar, lol. Like I just sit down and belly up for some ghz!

Anyway, I decided to start over on my oc and try offset voltage instead of fixed. Immediately I noticed more stability, albeit at higher voltages. My 4.5 was stable for 15 minutes of 1792 fft's, but with 1.37v, where it seemed to be stable before with fixed voltage at 1.32. I tested it at 1.32 and had a worker fail, so I'm giving 1.33 a shot right now. I really get the feeling that, number one, this board prefers offset voltage, and that I have a crappy chip for overclocking (relatively).

to go from 4.5 to 4.6 rquires a pretty big jump in voltage, I couldnt get it stable at 1.4 at all. I tried 4.7 at 1.45v, and it wouldnt even boot to windows. I'm not broken hearted, tbh I'm perfectly happy with 4.5, but it sure would have been nice to get to 4.7-4.8.

Anyway, still testing, but I'm thinking I might (I hope!) be ok with 4.5 at 1.34v.
post #2507 of 10702
Thread Starter 
Quote:
Originally Posted by donkrx View Post
Munaim1 I have a question.

Regarding a full shutdown/bsod vs having a worker fail, or "not passing" a computational stress test - I understand one is a more catastrophic failure than the other, but is there anything we can take away from if a worker fails? Is it an indicator of CPU PLL or VTT voltages (or something else possible), or is it just simply a general "voltage" issue and not an indicator of anything in particular.

I have not yet in my overclocking experience with SB had a worker fail. It's always a BSOD for me, and I've been very curious about this. Was there anything note worthy about changing CPU PLL for those you've been helping, besides just generally getting more/less stable?

EDIT: so wait you want screenshots of our BIOS settings? is that for people that have already proven stability?

bsod is generally saying that your computer is for too unstable to carry on, therefore it must shutdown. A worker failing however or not passing can indicate that your near stability and may require further tinkering in the BIOS. It's alwasy better to have a worker fail as oppsed to a bsod, general consensus is, if it bsods MORE vcore, if worker fails bump by one or two.

Changing PLL has had a dramtic effect on those trying to get their rig's stable, especially the tough 1344 and 1792 cutom FFTs. For those running, auto or 1.8v, more than likely required a higher vcore to pass the blend test as opposed to reducing the PLL voltage and using a lesser voltage.

It could be said that reducing the PLL voltage helps the Vcore in a way, for example, if your bsoding at 1.45v and the pll is at 1.8v you could try reducing the PLL voltage down to around 1.7v and 'maybe' reduce the vcore to get that stable, or it could be that you just need 1.45v for that overclock but your stability relies on the PLL voltage to be at 1.7v or around that particular region. PLL is actually quite important.

So far this is all the info that I have on the PLL voltage:

**PLL VOLTAGE INFO**

I been recently testing something for the last few days and that is PLL voltage. In the first few instance I've find that lowering actually helps stability for some cpu's, now it seems that more and more are actually trying it and results have been great.

Just 2 hours ago I recommended fuloran1 who was having having stability issue's for last few days to try the following thing:


Quote:
Originally Posted by munaim1 View Post
they are all on deafult I pressume?

What I want you to try is, decrease the PLL voltage to around 1.7/1.71v and test for stability and record what happens, then I want you to increase the PLL voltage to around 1.89v and again see what happens. The objective is to see whether or not your chip like high PLL or low PLL voltage, then we'll take it from there.

From having continous BSODS at the 7/8minute of the 1792 FFT he tried many things without success. He tried the above method and changed PLL voltage to 1.71v.


Quote:
Originally Posted by fuloran1 View Post
Ok, so now I didnt get a bsod, but a worker failed at 8 minutes. Raised pll to 1.89 and testing.
Progress!!!!! No bsod and worker failing can be an indication of near stability. Dropping the PLL certainly helped.


Here's another instance, Roksonixx kept failing the 1344 FTTs and then after trying the same thing:

Quote:
Originally Posted by Roksonixx
it might just be pure luck but i've put my PLL voltage down to 1.7v and vcore down 4 notches and im 10 minutes into those bloody 1344 fft's ....

fingers crossed! if i can get this to work i'll update my "stable" score in your thread

After a few minutes:

Quote:
Originally Posted by Roksonixx
i tried a few above 1.8 and down to 1.75, but i've just tried 1.7 and it's worked wonders...20 minutes into that damn test, with a nice low vcore now....

it's rather strange that a high voltage can throw things off, with vcore it doesnt matter if you're 0.01 or 0.1 above, it still works because it has "enough"

i'd recommend putting 124 bsod's on your thread to "too much / to little PLL voltage", because that's certainly what's happened here


Seems like PLL voltage does make a difference. He could be right in saying error 124 could correspond to PLL voltage as oposed to VTT (VCCIO) and vcore. This is a good find.!!


Again:

Quote:
Originally Posted by TwoCables View Post
As I mentioned earlier, I had a goal of finally passing Prime95 Custom @ 1344K using 7168MB (exactly 7GB) of memory for 30 minutes. Well, after a bunch of trials and errors, I finally did it! I stopped my test at 33 minutes because I just couldn't wait any longer.

http://home.comcast.net/~twocables/33Minutes%21.png (1680 x 1050)

I'm sorry for forgetting to include my name in Notepad, but I was a little bit too excited. So, let's just go by the date and time on the Taskbar for now.

Anyway, what allowed me to do this was dropping my CPU PLL Voltage all the way down to 1.70000V which seems to run at 1.693V - 1.696V (that is, after testing several different CPU PLL Voltages).

Yet more proof that, reducing PLL voltage is the way forward for getting the system stable, however he couldnt get it stable for the 1792FFT without a small PLL voltage bump to 1.70625v:

Quote:
Originally Posted by TwoCables View Post
I did it! After that 8-minute failure, I went straight to a CPU PLL of 1.68750V, but it failed after 4 minutes. So then I went straight to 1.70625V and it passed twice (30 minutes)!! Oh happy day!
My advice play around with the PLL voltage from 1.7v and you should be good.



BIOS templates are from those that have already submitted a stable screenshot.

Hope that helps
Edited by munaim1 - 8/11/11 at 4:47pm
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post #2508 of 10702
Nope, worker failed. Thanks for posting that about PLL Munaim, I will give dropping it a couple pof notches a go if this test fails. I had forgotten to disable spread spectrum so I did that and am testing again at 1.335v

*edit*
Well...disabling SS seems to have helped, it's been stable with the 1792 for over 10 minutes, longer than before. I'm going to give it 5 more then run the 1344.
Edited by fuloran1 - 8/11/11 at 4:56pm
post #2509 of 10702
Thread Starter 
Quote:
Originally Posted by fuloran1 View Post
Nope, worker failed. Thanks for posting that about PLL Munaim, I will give dropping it a couple pof notches a go if this test fails. I had forgotten to disable spread spectrum so I did that and am testing again at 1.335v

*edit*
Well...disabling SS seems to have helped, it's been stable with the 1792 for over 10 minutes, longer than before. I'm going to give it 5 more then run the 1344.

sure no worries.

Whats your PLL voltage, vcore and vccioa at now? Make sure you have enabled C1E and Speedstep and also disable C3 and C6 if your using offset voltage, if not then C3 and C6 should either be enabled or if your have the option, AUTO.
Edited by munaim1 - 8/11/11 at 5:01pm
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post #2510 of 10702
So munaim, what's your thought on SS and it's effect on stability? I'm over 15 min now on 1792 with no issues after disabling it. Wondering if I can drop some vcore now.
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