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when useing prime 95 to do full load test are you supposed to choose small FFTs or blend

post #1 of 12
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I have been doing prime 95 stress test on my i7 4770k and I have been choosing small FFTs option and monitoring my temps with real temp 3.70 my current temp doing small FFTs test is a max temp of 67c am I doing the prime 95 test the rite way ? or am I supposed to choose the blend test or in place large FFTs or custom test ?
    
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post #2 of 12

Blend, because it will stress the CPU's build in Integrated Memory Controller (IMC) at the same time. That will give you a much better stability test than Small FFTs or Large FFTs.

 

The Custom test (select Blend and then Custom) is even better because you can make it an even harder test of stability for your system by making it use about 80-85% of your memory. For you, that would be about 13107 MB to 13926 MB. Or, 13000 - 14000 MB if you want to round it.

 

The length of time is irrelevant. There are 82 FFT sizes and it takes about 24 hours for Prime95 to get through all of them at least once. So, I always recommend 24 hours.

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post #3 of 12
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

Blend, because it will stress the CPU's build in Integrated Memory Controller (IMC) at the same time. That will give you a much better stability test than Small FFTs or Large FFTs.

The Custom test (select Blend and then Custom) is even better because you can make it an even harder test of stability for your system by making it use about 80-85% of your memory. For you, that would be about 13107 MB to 13926 MB. Or, 13000 - 14000 MB if you want to round it.

The length of time is irrelevant. There are 82 FFT sizes and it takes about 24 hours for Prime95 to get through all of them at least once. So, I always recommend 24 hours.
I watched videos on you tube and they have some videos of choosing small FFTs and some videos of choosing blend test so I am a little confused I did the blend test and on real temp 3.70 it was saying I was using 50% to 60% load so I have been choosing small FFTs test to get 100% load and my max temp is 67c I did not choose advance options and check round off though
    
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post #4 of 12
How to properly use Prime95:

1) Make sure you have the latest version, 27.9 if i remember correctly. This is important as old versions did not support the harder to run AVX FFTs.
2) Close the box that pops up when you start the program, go to Advanced, and enable both SUM(INPUTS) Error checking and Round off error checking.
3) Go to Options and select Torture Test.
4) Select Blend, but do not hit OK. Then select Custom, this will copy the blend settings over to it.
5) Set "Memory to Use" to your maximum RAM minus 1GB (7000 for 8GB, 15000 for 16GB) etc.
6) Start the Torture test and open task manager. Make sure you are not paging RAM, you want about 5% physical RAM free. If you are paging RAM, restart it with lower RAM usage. If you have more free RAM than that, raise it instead. If you set RAM usage too high, paging can slow the test down and not fully stress the CPU/RAM.
7) Run the program for at least 24 hours. This is important, even though many claim 2-3 hours is plenty, it is not. If you are not able to run the program for 24 hours you should adjust the "Time to run each FFT" length accordingly. You want to do a full FFT loop, and with the default 15 minutes it's usually around 24 hours before it starts to repeat tests. Just because it's stable for 6 hours, it can still immediately crash with some FFTs. I don't recommend adjusting the length, just do a full test to ensure full stability.
8) Do NOT use the computer during testing. Your RAM is being pushed to the limits, opening a browser or other tasks will cause the entire computer to slow down and will affect the results.

Hopefully this helps. I wouldn't trust random Youtube videos. I've seen some people claims some pretty outrageous things, like running LinX for 20 passes on Normal settings is 100% stable. tongue.gif
Quote:
Originally Posted by orndorf77 View Post

I watched videos on you tube and they have some videos of choosing small FFTs and some videos of choosing blend test so I am a little confused I did the blend test and on real temp 3.70 it was saying I was using 50% to 60% load so I have been choosing small FFTs test to get 100% load and my max temp is 67c I did not choose advance options and check round off though

Blend should still be using 100% if settings and program is up to date. If it still isn't, my guess would be something is limiting your processor... or for some reason Prime is not detecting the correct amount of threads. Make sure it's set to 8 for a 4770k.
Edited by Murlocke - 3/20/14 at 10:16pm
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by Murlocke View Post

How to properly use Prime95:

1) Make sure you have the latest version, 27.9 if i remember correctly. This is important as old versions did not support the harder to run AVX FFTs.
2) Close the box that pops up when you start the program, go to Advanced, and enable both SUM(INPUTS) Error checking and Round off error checking.
3) Go to Options and select Torture Test.
4) Select Blend, but do not hit OK. Then select Custom, this will copy the blend settings over to it.
5) Set "Memory to Use" to your maximum RAM minus 1GB (7000 for 8GB, 15000 for 16GB) etc.
6) Start the Torture test and open task manager. Make sure you are not paging RAM, you want about 5% physical RAM free. If you are paging RAM, restart it with lower RAM usage. If you have more free RAM than that, raise it instead. If you set RAM usage too high, paging can slow the test down and not fully stress the CPU/RAM.
7) Run the program for at least 24 hours. This is important, even though many claim 2-3 hours is plenty, it is not. If you are not able to run the program for 24 hours you should adjust the "Time to run each FFT" length accordingly. You want to do a full FFT loop, and with the default 15 minutes it's usually around 24 hours before it starts to repeat tests. Just because it's stable for 6 hours, it can still immediately crash with some FFTs. I don't recommend adjusting the length, just do a full test to ensure full stability.
8) Do NOT use the computer during testing. Your RAM is being pushed to the limits, opening a browser or other tasks will cause the entire computer to slow down and will affect the results.

Hopefully this helps. I wouldn't trust random Youtube videos. I've seen some people claims some pretty outrageous things, like running LinX for 20 passes on Normal settings is 100% stable. tongue.gif
the way I have been doing it is opening realtemp 3.70 then opening prime95 and choosing small FFTs and letting it run for 15 minutes and my max temp for my i7 4770k not overclocked has been 67c . if I do it your way will my temps be lower or higher then what I am getting now ?
    
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post #6 of 12
Quote:
How to properly use Prime95:

1) Make sure you have the latest version, 27.9 if i remember correctly. This is important as old versions did not support the harder to run AVX FFTs.

There's been a bunch of v28's now that are harder, i wouldn't run them on Haswell though~

to OP, read the haswell guide on ocn
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post #7 of 12
Quote:
Originally Posted by orndorf77 View Post

the way I have been doing it is opening realtemp 3.70 then opening prime95 and choosing small FFTs and letting it run for 15 minutes and my max temp for my i7 4770k not overclocked has been 67c . if I do it your way will my temps be lower or higher then what I am getting now ?

That's normal. Blend will test the smaller FFTs within time, and you will see those temps when it starts running 8k FFTs about 15 minutes after Blend has ran.

Running either Blend or Custom is not going to be the best method, you need to use the custom method TwoCables and I suggested.
Edited by Murlocke - 3/20/14 at 10:22pm
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post #8 of 12
Quote:
Originally Posted by orndorf77 View Post


I watched videos on you tube and they have some videos of choosing small FFTs and some videos of choosing blend test so I am a little confused I did the blend test and on real temp 3.70 it was saying I was using 50% to 60% load so I have been choosing small FFTs test to get 100% load and my max temp is 67c I did not choose advance options and check round off though

 

Anyone who recommends doing just the Small FFTs or the Large FFTs for Sandy Bridge, Ivy Bridge, Haswell, or newer doesn't know what they're talking about because they clearly don't know that these CPUs have an IMC (Integrated Memory Controller). Therefore, Blend is the best out of the default tests, but Custom Blend using about 80-85% of your memory (as I showed you before) is the very best. Again, for about 24 hours.

 

 

Quote:
Originally Posted by orndorf77 View Post


the way I have been doing it is opening realtemp 3.70 then opening prime95 and choosing small FFTs and letting it run for 15 minutes and my max temp for my i7 4770k not overclocked has been 67c . if I do it your way will my temps be lower or higher then what I am getting now ?

 

Higher. Not by much, but you'll have higher temperatures.

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post #9 of 12
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

Anyone who recommends doing just the Small FFTs or the Large FFTs for Sandy Bridge, Ivy Bridge, Haswell, or newer doesn't know what they're talking about because they clearly don't know that these CPUs have an IMC (Integrated Memory Controller). Therefore, Blend is the best out of the default tests, but Custom Blend using about 80-85% of your memory (as I showed you before) is the very best. Again, for about 24 hours.



Higher. Not by much, but you'll have higher temperatures.
can I damage my cpu running the test for that long ?
    
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post #10 of 12
Quote:
Originally Posted by orndorf77 View Post


can I damage my cpu running the test for that long ?

 

Yeah, it will explode and set your house on fire. lol No, of course not. Why would we be recommending it if it would damage your CPU? You could run it for a week straight like that and it would be fine!

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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 
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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... 
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Overclock.net › Forums › Cooling › Other Cooling Discussions › when useing prime 95 to do full load test are you supposed to choose small FFTs or blend