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# Just how long do you really need to run prime 95 if you're going to do is play the latest games? - Page 5

Quote:
Originally Posted by TwoCables

Prime95 v27.7 build 2's Blend test has 82 FFTs.  However, even using the older version of Prime95 that has 70 FFTs (I don't know which version that is), it will take longer than 17.5 hours to go through all 70 FFTs at 15 minutes per FFT because there is a delay in between each FFT.  This means the math is not simply 70x15 equals 1,050, 1,050 divided by 60 equals 17.5.

For example, in order to find out how many FFTs Prime95 v27.7 build 2 has in its Blend test, I ran the Custom Blend test at 1 minute per FFT and waited until I saw it starting up the first FFT a 2nd time.  It took exactly 105 minutes to get through all 82 FFTs instead of 82 minutes.  I expected 82 minutes, but 105 minutes is what it took.  Now, 82x15 equals 1,230 minutes.  1,230 minutes divided by 60 is 20.5, which means 20.5 hours if there's no delay in between each FFT.  However, there happens to be a delay in between each FFT.  So how long would 82 FFTs actually take at 15 minutes per FFT?  I am guessing it would take approximately 24 hours and 49 minutes if the delay is always the same in between each FFT test.

Here's why I think that:  82 divided by 105 is about 0.79.  This means that there's a 21% increase over my expected 82 minutes.  So 20.5 hours multiplied by .21 for 21% equals 24.805 hours which means 24 hours, 48 minutes, and 18 seconds.

If it's always a 21% increase above the expected (that is, the expected as found by multiplying the number of FFTs by the number of minutes for each FFT and then dividing by 60), then 10 minutes per FFT for 82 FFTs would be 16 hours, 32 minutes, and 27 seconds.  I mean, 13.67 x .21, then add the result to 13.67.

I doubt that it's always a 21% increase, but this is all I have to go by right now.

Edit:  Prime95 v27.7 build 2 is the only version right now that supports the AVX instruction set.  However, Windows 7 SP1 is required because SP1 provides access to the AVX instruction set.  Or, it provides support - or however it should be described.

I'll guess I'll just try feeling it out then. What is the absolute worst that could happen if the overclock isn't stable though? I completely corrupt my game and have to reinstall, damage to data on my ssd/hdd? Or just random crashes, that sort of thing?

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Quote:
Originally Posted by ecksodia

I'll guess I'll just try feeling it out then. What is the absolute worst that could happen if the overclock isn't stable though? I completely corrupt my game and have to reinstall, damage to data on my ssd/hdd? Or just random crashes, that sort of thing?

I don't know for sure yet, but I think some people think that any data that is being stored in your memory sticks could get very corrupted, and others seem to also think that the more unstable a system, the more stress there is on it.  I don't have any personal experience with instability beyond weird little anomalies and strange little behaviors throughout Windows and some of the programs I have installed.

Actually, I recently lowered my LLC level to see if there was any difference in my core temps even though I would make sure my full-load voltage doesn't change.  At first, I didn't raise the voltage enough in order to compensate.  My first clue was when I tried to open Real Temp, Prime95, and CPU-Z by just opening the Start Menu, typing one of their names, and pressing Enter.  I don't remember exactly what happened, but I remember that it didn't function correctly at all, so I didn't even bother trying to open them manually and I rebooted and raised the core voltage a few levels and then everything was fine.

So, I think that the more stable a system is, the easier it can function flawlessly.  If data corruption is possible, then I guess that makes sense because if the system isn't stable, then any data you ask it to handle could get corrupted while it's being handled.

Not only that, but the more stable my system is, the easier it is for me to relax.  So for me, I think it's more about the peace of mind and my ability to be as confident as possible while using my computer instead of having a little bit of doubt and fear that it might suddenly lock-up on me or have a BSOD, or have a program crash, or something else.

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make sure you run Prime95 for 24 hours, that way when your computer crashes you'll know it must be due to one of the other gazillion reasons.
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Quote:
Originally Posted by TwoCables

I don't know for sure yet, but I think some people think that any data that is being stored in your memory sticks could get very corrupted, and others seem to also think that the more unstable a system, the more stress there is on it.  I don't have any personal experience with instability beyond weird little anomalies and strange little behaviors throughout Windows and some of the programs I have installed.

Actually, I recently lowered my LLC level to see if there was any difference in my core temps even though I would make sure my full-load voltage doesn't change.  At first, I didn't raise the voltage enough in order to compensate.  My first clue was when I tried to open Real Temp, Prime95, and CPU-Z by just opening the Start Menu, typing one of their names, and pressing Enter.  I don't remember exactly what happened, but I remember that it didn't function correctly at all, so I didn't even bother trying to open them manually and I rebooted and raised the core voltage a few levels and then everything was fine.

So, I think that the more stable a system is, the easier it can function flawlessly.  If data corruption is possible, then I guess that makes sense because if the system isn't stable, then any data you ask it to handle could get corrupted while it's being handled.

Not only that, but the more stable my system is, the easier it is for me to relax.  So for me, I think it's more about the peace of mind and my ability to be as confident as possible while using my computer instead of having a little bit of doubt and fear that it might suddenly lock-up on me or have a BSOD, or have a program crash, or something else.

When using IBT what's the highest temp I should go? 95 is still okay? My reasoning is it's never coming close to that kind of stress but I'm worried the ~minute or so it's around 90 every run of IBT (so it can add up if there are, say, 10 runs) can really damage my cpu in the long run.
Quote:
Originally Posted by Murlocke

It should be about 12 hours. They may have added more FFTs in later versions.
If I can pass 12 hours of the latest Prime95, and 50+ loops of IBT on Extreme.. i've never had issues pop up on any of my builds relating to my overclock. I have old builds that friends have bought from me still rocking the same overclock 5-6 years later. It really depends on how stable you want to be, I prefer to overkill it.

50+ loops at max memory available?! What are the temps you're getting on that?
Quote:
Originally Posted by TwoCables

If Windows is set to automatically restart upon a BSOD (it's set this way by default), then you can check the "Up Time" in Task Manager's Performance tab to see how long ago it occurred.  Or, check Event Viewer to see what time it happened at.

If it locks up, then you'll be able to just look at the time stamp in Prime95 or the Windows clock.

If one of the workers fails, then you'll be able to check the time stamp in Prime95 for that failed worker to see when it failed.

Thanks for the info. I will do this when I leave for work. :-)
If it doesn't go over ~90 on a stress test, I personally wouldn't worry about it on an Ivy Bridge, but 95 is a little too hot for my tastes. Different people have differing opinions on what is safe. I stop my 2700k if it goes over ~83 degrees and a 3570k can handle about 7 degrees higher. (I try and stay 15 degrees under TJmax... Ivy Bridge TJmax is 105... That's where I draw my line in the sand.)
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I run prime95 for 48 hours minimum...but I am a CAD designer and some things I have to create can take up to a week to render on keyshot @ 100% load. Stability is especially important to me as if it fails a few days in I have to start the process all over again

For gaming I would say 6 hours is plenty as most of these new games story lines don't even last that long plus are never really that taxing to the CPU for sustained periods.
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Quote:
Originally Posted by ecksodia

When using IBT what's the highest temp I should go? 95 is still okay? My reasoning is it's never coming close to that kind of stress but I'm worried the ~minute or so it's around 90 every run of IBT (so it can add up if there are, say, 10 runs) can really damage my cpu in the long run.

I'm not 100% sure, but the Tj. Max temp is the temp when the CPU should throttle itself down in order to reduce the possibility of damage.  If for some reason this trigger fails to work (rare), then it's set to turn itself off completely if it were to reach 130°C.

Unfortunately, my only source right now is a couple of other OCN members.

Quote:
Originally Posted by dragonsamus

Thanks for the info. I will do this when I leave for work. :-)

If, by chance, you have to leave for work as soon as you wake up, then you can also start the test right before going to bed.  ;)

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250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner
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Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG Filco Majestouch 104-key Cherry MX Blues w/NKRO