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Intel Burn Test...how much is 'enough'..? - Page 6

post #51 of 143
Well I have some input for this thread. First off I have done 200 passed with IBT before and failed at 199. Talk about a hear break.

I test like this.
I run IBT for 200 times to get a initial stable oc.
Then I rune Prime small FFTs over night 12 hrs +
Then I run Prime blend for 8+ hours.
Then the final tests are benchmarks and games.

After those all pass I consider myself stable. So far I haven't had a BSOD,Crash etc yet. And my PC has been running for 2+ months.

Another weird thing I have found with stability testing is Core I7 is weird when doing stability testing. For instance I ran 200+ IBT, Then ran prime overnight and I restarted my PC and got a instant BSOD. Now that really was frustrating.
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post #52 of 143
Quote:
Originally Posted by lowkickqop View Post
Quote:
Originally Posted by lowkickqop View Post
Standard setting and blend test.
Just ran 25 passes of Intel Burn test on maximum. It passed. As soon as I rebooted and tried running it again it crashed. That's what normally happens. This CPU may be jinxed.
I purposely combined the above quotes.

Anyway, 25 passes isn't enough. But in reality, in order for an overclock to be considered stable, and in order to avoid running into problems later on down the road due to instability, the overclock must be able to do the following:
  • At least 12 hours of the Small FFTs test in Prime95 (Orthos is good, but it doesn't have a 64-bit version)
  • At least 10 hours of the Blend test.
  • At least 8 hours of the Large, in-place FFTs test.
  • At least 50-100 runs of linpack (using Maximum in IBT, or clicking the "All" button in LinX). Why 50-100? Because that's what is recommended in LinX's Read Me file. It also recommends using the most amount of memory possible. So if clicking "All" means the test won't even run, then manually reduce the amount by maybe 5-10 MB at a time until it runs.
  • At least 7-10 passes in Memtest. Even if your memory isn't overclocked, it's still necessary to run this because the CPU is overclocked.
Try to avoid thinking of these as "tests". After all, they're just programs that are far more stressful on your system than anything else out there (especially linpack), and so it's a really good way to test the overclock to see how stable it is. Therefore, the goal is to keep tweaking the overclock while attempting these lengths of time in order to make it stable enough to last that long for each.

I know this seems extremely extreme, very excessive, and absolutely unnecessary, but I see questions like this every single week where people are like "but my overclock is rock-solid stable. It can do 8 hours of Blend and 20 of linpack, but yet I am still having problems. Why?" The answer to that is that the overclock is still too unstable.

I personally guarantee you that if your overclock can do all of this, then you will never, ever, ever, ever, ever run into problems due to instability. It would be so stable that you could probably trust it as a high-traffic server.

Now, if you're like me, then you might be overwhelmed by this recommendation. But every test can be (and should be) ran while you're sleeping - especially when you can't use the computer when you wake up but instead have to go to like work or school, or someplace. I mean, it's not necessary to watch it, or to "keep an eye on it". But the main thing is this: do not use the computer during any of these tests. It forces the CPU to share clock cycles with whatever it is (even simple internet browsing/checking e-mail), and therefore it reduces the accuracy of the test.
Quote:
Originally Posted by wickedout View Post
I'm a huge fan of the Intel Burn test. I don't understand why anyone would run a stress test on a CPU for 8 hours like on Prime 95.

I for one don't have the time or patients for that kind of test.

Intel Burn test FTW! It works great if not better then Prime.
The reason why Prime95 should still be used is because it is different linpack, not inferior. Conversely, linpack should be used in addition to prime because again, it's different. Both stress the CPU and your system in different ways from each other. Not only that, but even 200 linpack runs with the "Maximum" setting in IBT doesn't guarantee that it's stable. It only guarantees that it's stable enough to do those 200 runs. But the question still remains: is it stable enough for all of Prime95's tests? Is it stable enough for Memtest?

So one isn't better or inferior to the other. They're different, and they are both equally good. They are stress testing tools, and neither of them should ever be neglected or ignored. By ignoring one or the other, you're setting yourself up for future failure and frustration and confusion with a question like "I'm having problems, but it's not my overclock because it's extremely stable. After all, it can pass 100 runs in IBT! So what's going on?" The answer is that it's not stable and you're now beginning to see how unstable it is. An unstable overclock can seem stable for as long as a few months. But rest assured, the problems due to instability will rear their ugly heads, and when they do, it's going to be really frustrating.

So, if you don't think you have the time or the patience for it, then think again: you can start the test right before going to bed, and then checking the test again when you get home from work or school the next day. You can do this every day while continuing to tweak (or, increase the stability of) the overclock until it can last as long as I recommend. I mean, it's absolutely ok to leave the house while the test is running - even if it fails while you're gone.
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post #53 of 143
Quote:
Originally Posted by Chrono Detector View Post
I usually do at least 20 runs on maximum stress, because doing it on standard does not mean anything.
This post made me depressed. I just realized I've been running Standard IBT this whole time.

Edit: I just did 25 runs of high stress level test in IBT ( 1/2 of RAM ) with 1.42500vCore.
You guys think that's stable? Do I really have to do Maximum?
Edited by Zensou - 10/19/09 at 6:42am
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post #54 of 143
Quote:
Originally Posted by Zensou View Post
This post made me depressed. I just realized I've been running Standard IBT this whole time.

Edit: I just did 25 runs of high stress level test in IBT ( 1/2 of RAM ) with 1.42500vCore.
You guys think that's stable? Do I really have to do Maximum?
In my personal experience combined with what I see here on a weekly basis (and sometimes daily), I would say that whether or not this is stable is uncertain. I would continue by saying that the only way to be absolutely certain is to subscribe to the testing method that I described in my last reply to this thread, which is right above yours. After all, all we are certain about right now is that the overclock is stable enough to do 25 runs of linpack with only half of the memory used, and from what I've seen, this is usually not enough. I see many people who have had their overclock going for a few months only to be saying something like "I'm having these problems, but it's not my overclock because it's 100% stable. After all, it can run 8 hours of Prime95 blend, and 20 linpack runs". While that may seem like enough, for some reason it's not. It seems like the answer is that the overclock isn't stable, so the stability needs to be increased, because every time they increase the stability, their problems go away and they're left going "that doesn't make sense".

Now, I want to help motivate you here, so here's something I learned recently: all overclocks are unstable by nature. But the more stable an overclock is, the safer the overclock is. And, of course, the more stable an overclock is, the longer everything will last.

But even after having said all this, I am curious: how long have you had your overclock, and have you experienced any problems during that time?
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post #55 of 143
I considered my OC stable with the following passed tests: 12 hr. Prime95 Blend / 6 hr. Prime95 SmallFFT / 4hr. OCCT Large / 50 passes LinX / 25 Passes IBT @ 1/2 Ram.

However, this thread is making me wonder if I should conduct more testing to be sure as I want this OC to last for the next 2 years and I want to avoid degrading my CPU. I am wondering though if putting your CPU through the multiple hours and days of testing that TwoCables suggests would damage it at all? As it does seem to me to be a bit extreme.
post #56 of 143
Quote:
Originally Posted by TwoCables View Post
I am curious: how long have you had your overclock, and have you experienced any problems during that time?
How long? I don't know, I just( like yesterday ) hit 3.4Ghz at 1.45v, ran IBT, lowered vcore, ran IBT, lowered vcore, ran IBT, now I'm at 1.42500, did 8.5 hours blend test and a couple runs of memtest86+. Did IBT 25 runs @ High Stress level.
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post #57 of 143
Quote:
Originally Posted by Zensou View Post
How long? I don't know, I just( like yesterday ) hit 3.4Ghz at 1.45v, ran IBT, lowered vcore, ran IBT, lowered vcore, ran IBT, now I'm at 1.42500, did 8.5 hours blend test and a couple runs of memtest86+. Did IBT 25 runs @ High Stress level.
Then you can either hope that it's stable and wait and see if you end up running into problems later, or you can be absolutely 100% sure by seeing if the overclock is stable enough to pass the "extreme" testing routine I have learned. I mean, if the system can stay stable through all of that, then you can be absolutely certain that you won't suddenly run into problems later on down the road due to long-term instability.

However, I'm not trying to push the more-extreme method on you. I really do believe that it's all up to you. After all, it could be really stable (some people get lucky like that). But I will present a couple of things that I think are important to consider: all overclocks are unstable by nature. But using an unstable overclock for an extended period of time - even though it may be just stable enough to do what you do on a daily basis - has the potential to be harmful since it's more stressful for a system to try and operate while unstable than it is for it to operate while it's stable. This is especially true for the long-term. And that's just it: I've seen so many people who think their overclock is rock-solid stable because it has been problem-free for over a month, but now they're experiencing problems and don't know what's causing them. But the problems are almost always caused by instability finally rearing its ugly head.

So, on one hand you can just call it stable for now and see what happens. Who knows? It may last 6+ months without any errors, lock-ups, etc. But on the other hand, you can be absolutely 100% certain that it's stable so that you can rest assured with the peace of mind that you can throw anything at your computer, and it won't crash.
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post #58 of 143
Well TwoCables is definitely right. I did all my testing with a vcore of 1.35 but lately I thought "I should be able to get it lower than this" so I bumped it down to 1.325 ran IBT a few times plus Prime95 for 6hrs and called it "stable." Just now I got a lockup playing Mass Effect! So it's back up to 1.35v on the vcore since I KNOW I'm stable there and it's better to be stable with a high vcore than unstable with 1* lower temps.
post #59 of 143
Hrrm, I tried doing maximum and got BSoD.
Raised vcore 1 notch to 1.43750 and did 20 runs Maximum in IBT. I think this is pretty stable. Do you? I haven't had any problems running games and other apps. Only times I encounter any problems is when I don't supply enough voltage to the overclock.
Also, I followed "ChickenInferno's correct TJ. Max guide" and set my offsets to -10c in Coretemp because Q6600's tj. max is 90c not 100.
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post #60 of 143
Quote:
Originally Posted by Zensou View Post
Hrrm, I tried doing maximum and got BSoD.
Raised vcore 1 notch to 1.43750 and did 20 runs Maximum in IBT. I think this is pretty stable. Do you? I haven't had any problems running games and other apps. Only times I encounter any problems is when I don't supply enough voltage to the overclock.
Also, I followed "ChickenInferno's correct TJ. Max guide" and set my offsets to -10c in Coretemp because Q6600's tj. max is 90c not 100.
90°C can't be correct in this case because 24°C while idle would mean that it's 75.2°F in that screenshot, and that's very unrealistic unless your ambient temps are in the low to mid 50's. I mean, that's 1.424V going through a quad core, so the idle temp should be over 30 for sure. And then there's the matter of the 65°C maximum temperature: I don't see how this can be accurate since the linpack test should put the temperature into the 70's with this voltage. In other words, I think this specific Q6600's Tj. Max is closer to 100°C. Unfortunately, they're not all at 90°C. But I won't try to explain this because ChickenInferno can explain it far better than I can.

But anyway, how certain do you want to be regarding whether or not it's stable? If you want to be 100% certain, then refer to what I posted here in post #53 of this thread. It's not so much my opinion, but rather it's what I have learned. I have discovered that in order to be absolutely certain it is stable, this is what has to be done. I see way too many people post things like "I'm having these problems, but it's not my overclock because I know it's rock-solid stable. After all, it can do 30 runs of IBT at the maximum setting, and 10 hours of Prime95". Unfortunately, while this certainly seems like it's a lot, it's really not.

I have also seen people who seem to think that relying on just linpack or Prime95 (but not both) is the way to go. Many people seem to think that linpack is far superior to Prime95, but it's not: they are different from each other, and they must both be used. Many people have found that their overclock can survive like a 100 runs of linpack at the maximum setting, but can barely make it through the Prime95 tests. Conversely, many have found that while their overclock can make it through 12+ hours each of all 3 of the default Prime95 tests, it can barely make it through 5-10 linpack runs. This is an indication that the stability of the overclock must be increased, or in other words: it's just not stable.

So, is 20 enough? Maybe. I mean, you could be lucky and you could have just the right settings in the BIOS for a rock-solid stable overclock. But if it were my system, then I would want to be absolutely 100% certain that it's stable. But that is because I know that all overclocks are unstable by nature, and the more stable an overclock is, the safer it is and the longer the system can last in an overclocked state.

But it's all up to you. I mean, you can wait it out and see what happens. But if you do that, you could end up like some other people who come here saying that they're suddenly experiencing problems even though the overclock was stable and problem free for the past 2-3 months. Or, you could be like those people who set their BIOS back to the manufacturer's default settings, or manually set it back to stock only to find that they can't overclock anymore (sometimes an overclock is set back to default stock settings to diagnose a problem that is caused by instability). That's evidence of how unsafe an unstable overclock can be, but not evidence of what will definitely happen. It's just a possibility.
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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
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Overclock.net › Forums › Intel › Intel CPUs › Intel Burn Test...how much is 'enough'..?