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Why some people don't like Prime95 - Page 41

post #401 of 422
I downloaded prime95 v28.5 and saw that by default Blend has 3 min per FFT. I didn't opt to participate in mersenne prime number finding program (whatever the prompt on firt launch says, I rejected to join that program and choose for stress test only) may be that's why Blend is 3 min since I don't need to find primes only stressing
    
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post #402 of 422
Blend is 3 mins by default in 28.5, but 15 mins in 27.9 IIRC.
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post #403 of 422
Yeah right thumb.gif I noticed that too.

I was just thinking that Blend uses 8-threads while CPU:OCCT uses 16-threads (when set to automatic), does that increase power consumption and stress or only RAM usage. I'll go home and try to see if 32-threads vs 16-threads vs 8-threads have any difference in thermals. I don't have wattmeter to check power consumption.
    
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post #404 of 422
Quote:
Originally Posted by imran27 View Post

Yeah right thumb.gif I noticed that too.

I was just thinking that Blend uses 8-threads while CPU:OCCT uses 16-threads (when set to automatic), does that increase power consumption and stress or only RAM usage. I'll go home and try to see if 32-threads vs 16-threads vs 8-threads have any difference in thermals. I don't have wattmeter to check power consumption.

Some loads need to double up threads per core to not have idle periods on the CPU, x264 runs with a higher average CPU load % with 8 threads on 4c4t CPU and with 16 on 4c8t CPU for example. It's marginal, but say for example 98.8% instead of 99.9%.
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post #405 of 422
i find that using prime 95 to max out my core temps over a period of several hours can allow me to refine a stable overclock, while safeguarding against future, possible thermal-related core shut-down in the middle of a skyrim quest, or during the windows shut-down procedures/ re-saving of os-necesarry files to my 0-fault-tolerant raid 0 array .
post #406 of 422
The reason stability testing is a subject that tends to arouse passions when it comes up, I think, is because at the root of it we're chasing something that is unattainable -- 100% stability. There is no such thing. All systems, at any settings, will fail. The only question is WHEN. That's not to say that stability testing isn't important or necessary, just that if you find yourself unsure whether you have to run Prime95 for 24 hours to be "stable" or if 10 hours of IBT would be "more stable" the reason you can't quite shake the uncertainty is because you're chasing a concept that is undefined:

For a genetic researcher, "stable" might be accessing databases for research and protein folding when the system is idle. How many hours of Prime95 is equivalent to that? ... .... Beuller.... Beuller..... ?

For a gamer, "stable" might be 8 hours of Crysis at 1440p with fans at a reasonable volume. Is that equal to 4 hours of Prime95 or 3 of OCCT?

For a day trader, "stable" might be an active Bloomberg terminal + Excel + algorithmic applications with all other processes deactivated to save resources for fast calculations. Is that 3 hours of IBT or 24 hours of Prime95? Is there a metric conversion chart for this stuff?

See the problem?

And at the end of the day, all of those systems WILL fail at some point under some circumstance no matter how "stable" they seem today. It's physics, nothing lasts forever; materials degrade.

Ask yourself what you need from your system and what "stable" means for you. When you can answer that precisely using language that refers to specific measurable tasks & functions, you have an attainable & testable definition for stability (which may or may not include Prime95).
___

With that said, my personal subjective opinion is that there's absolutely no reason to subject your system to hour after hour of synthetic stress unless that synthetic stress IS your thing. If gaming, or animating, or media encoding is your thing save your hardware for doing what you got it for and leave the "24 hours of Prime" to the benchers.
Edited by chrisnyc75 - 7/22/14 at 8:49pm
post #407 of 422
24hr prime or 82 FFTs whichever is shorter, is not only for benchers it is for anyone who wants to minimize the number of hard errors occurring per minute. They keep occurring, when we OC they increase in rate, but if we are STABLE at that OC settings we probably achieved the minimum rate of hardware errors thereby minimizing the chance of a failure.

It's about attaining the minimum rate of hardware error occurrences at that particular settings.
    
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post #408 of 422
Hello

This is the most recent active thread I could find about Prime95 so I would like to ask a question, my apologies if I am off topic.

My goal is to find the Core voltage required for a certain clock speed, as fast as possible - meaning, without having to stress-test for hours. So, I want to find how much core voltage I need starting from 4.0GHz and going up to 4.7GHz. I do not believe I can go higher with my system.

Is this the best way to achieve my goal, when using Prime95 v.28.5? Warning: Spoiler! (Click to show)

I've decided to use the latest version of Prime because they say it is the fastest way.
What other software could I use to achieve this?

Please understand that I am just trying to find my Vcore for these clock speeds: 4.0 , 4.1, 4.2, 4.3, 4.4, 4.5, 4.6 and 4.7GHz. After that I will stress test for stability, at 4.7GHz, using either Prime95 v.28.5 with AVX, etc disabled and/or the x264 stress test. Right now though I just wish to see how my CPU is scaling (if this is the correct term for it).

@Blameless, @Cyro999, what is your opinion, please?

Thank you.
Edited by LostParticle - 10/23/14 at 4:35am
    
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post #409 of 422
Thread Starter 
@ Lost Particle

What you seek is called IBT AVX (run Very High or Maximum and only if you get negative results, consider it a fail no matter what it says) and is in the 1st page of the "Vishera Owners" thread. Prime isn't for "as fast as possible".
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post #410 of 422
Quote:
Originally Posted by Undervolter View Post

@ Lost Particle

What you seek is called IBT AVX (run Very High or Maximum and only if you get negative results, consider it a fail no matter what it says) and is in the 1st page of the "Vishera Owners" thread. Prime isn't for "as fast as possible".

Thanks for your reply/support!

I have downloaded two IBT AVX programs, not sure if they are the same version. One is from the Vishera page you mention, The other is IntelBurnTest 2.54(11.0.1.005), from this site. Which one would you suggest me to use?

When it comes to Prime95, is it wrong that thing they suggest then? Is it wrong/not so efficient using 1344K in Min FFT size?

Thanks!

Update:
Neither of these two different(?) versions of IBT AVX I have downloaded runs on my system. The program starts and after a few seconds Windows give me an error that "the program stopped working"... [specifically: Linpack64.exe has stopped working].
I am on stock settings - Optimal Defaults. When I changed to override mode voltage it did not work, either. Please see my rig for my system. This version works for me.
Edited by LostParticle - 10/23/14 at 6:52am
    
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