Prime95 - Stress Test Your CPU  

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    Prime95 - Stress Test Your CPU

    Prime95 - Stress Test Your CPU

    Stress test your CPU for stability issues with Prime95
    Published by Category: Performance & Maintenance
    18 May 2019
    Designer Media Ltd



    Prime95 - Stress Test Your CPU



    Prime95
    is a freeware program originally designed to find new Mersenne prime numbers. Given the nature of Prime95 it is now widely used as a CPU stress testing utility to gauge the stability of a CPU, especially when overclocking a system. It includes a Torture Test designed specifically to test PC subsystems for errors.

    Prime95's stress test feature can be configured to test various system components by changing the FFT size. There are three pre-set configurations available:

    • Small FFTs (Primarily tests FPU and CPU caches)
    • In-Place FFTs (Maximum power consumption; tests FPU and CPU caches, some RAM)
    • Blend (Tests everything including RAM)

    On a completely stable system Prime95 will run indefinitely. If an error occurs the stress test will terminate indicating the system may be unstable.

    warning   Warning

    While running Prime95 your CPU will become incredibly hot, it is imperative that you keep a constant watch of your CPU temperature with a system monitoring utility such as Speccy, Speedfan or HWMonitor. If your CPU temperature does reach dangerous levels stop the Prime95 stress test to prevent inflicting damage on your CPU.

    Note   Note

    Run Prime95 for up to three hours, unless errors occur sooner. Depending on temperatures feel fee to run the test for longer to thoroughly test overclock or system stability



    Here's how:

    1: Download the relevant version of Prime95 for your system.

    2: Extract the zipped folder.

    3: Open the extracted folder and click on the prime95.exe.

    Prime95 - Stress Test Your CPU-icon.jpg

    4:
    When Prime95 launches click on the Just Stress Testing button.

    Prime95 - Stress Test Your CPU-1.jpg

    5: Select Small FFTs (or whichever specific test you've been asked to perform if different). Click OK to start the test.

    Prime95 - Stress Test Your CPU-2-test-type.jpg

    6: A Worker thread will open for each Logical CPU, these threads will update information about every Logical CPU being tested.

    Prime95 - Stress Test Your CPU-3-test-1.jpg

    information   Information
    If one or more threads fail the Worker/s will stop and you will see the following message in the relevant thread/s
    Code:
    FATAL ERROR: Rounding was 0.XXXX, expected less than 0.XXXX
    Hardware failure detected, consult stress.txt file


    7: To stop the test at any time click on Test then Stop... from the resulting context menu.

    Prime95 - Stress Test Your CPU-4-stop.jpg

    8: If the test runs without detecting any errors the results will look similar to the results shown in the screenshot below.

    Prime95 - Stress Test Your CPU-5-results.jpg



    That's it,
    Gav.




  1. ICIT2LOL's Avatar
    Posts : 8,746
    Windows 10 Pro on all on various machines version 21H1
       #1

    Hello Gav mate this tutorial I am assuming it will be ok for users of 7??
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  2. Brink's Avatar
    Posts : 60,467
    64-bit Windows 11 Pro for Workstations
       #2

    Correct. :)
      My Computers

  3. ICIT2LOL's Avatar
    Posts : 8,746
    Windows 10 Pro on all on various machines version 21H1
       #3

    Thanks Shawn I thought perhaps it may have been configured for 10 with the link. :)
      My Computer

  4. Cliff S's Avatar
    Posts : 26,192
    Win11 Pro, Win10 Pro N, Win10 Home, Windows 8.1 Pro, Ubuntu
       #4

    I just found out you can get Prime95 portable using Chocolaty(PowerShell): Chocolatey Gallery | Prime95 (Portable) 28.7

    To install Prime95 (Portable), run the following command from the command line or from PowerShell:
    C:\> choco install prime95.portable -version 28.7

    To upgrade Prime95 (Portable), run the following command from the command line or from PowerShell:
    C:\> choco upgrade prime95.portable -version 28.7
    Code:
    tools\chocolateyinstall.ps1                         Hide                     
    
    1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 $ErrorActionPreference = 'Stop' $packageName= 'prime95.portable' $toolsDir = "$(Split-Path -parent $MyInvocation.MyCommand.Definition)" $url = 'http://www.mersenne.org/ftp_root/gim...v287.win32.zip' $url64 = 'http://www.mersenne.org/ftp_root/gim...v287.win64.zip' $ExeFile = 'prime95.exe' $ShortcutName = 'Prime95' $packageArgs = @{ packageName = $packageName unzipLocation = $toolsDir fileType = 'ZIP' url = $url } Install-ChocolateyZipPackage @packageArgs Install-ChocolateyShortcut -shortcutFilePath "$env:Public\Desktop\$ShortcutName.lnk" -targetPath "$env:ChocolateyInstall\lib\$packageName\tools\$ExeFile" Install-ChocolateyShortcut -shortcutFilePath "$env:ProgramData\Microsoft\Windows\Start Menu\Programs\$ShortcutName.lnk" -targetPath "$toolsDir\$ExeFile" -WorkingDirectory "$toolsDir"
    tools\chocolateyuninstall.ps1 Hide
    1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 $packageName= 'prime95.portable' $ShortcutName = 'Prime95' if((get-process "prime95" -ea SilentlyContinue) -eq $Null){ Write-Host "prime95 not running. (Good!)" } else{ Write-Host "Stopping Prime95..." Stop-Process -processname "prime95" Start-Sleep -s 3 } Uninstall-ChocolateyZipPackage remove-item "$env:Public\Desktop\$ShortcutName.lnk" -Force -ErrorAction 'SilentlyContinue' remove-item "$env:ProgramData\Microsoft\Windows\Start Menu\Programs\$ShortcutName.lnk" -Force -ErrorAction 'SilentlyContinue'
      My Computers

  5. Cliff S's Avatar
    Posts : 26,192
    Win11 Pro, Win10 Pro N, Win10 Home, Windows 8.1 Pro, Ubuntu
       #5

    I'm trying Prime95(V. 28.10 build 19) for the first time today, to check my 4.9GHz OC.
    But it only stays between 4.0 and 4.4GHz

    I tried it with my OC testing settings( Vcore set to override, and CPU Ratio set to fixed), and my Daily settings(Vcore set to Adaptive, and CPU Ratio set to Dynamic) and it seems to make no difference.

    I haven't seen this in any other stress test or benchmark software.

    Any clues as to why?

    I'm able to use my system still, with no freezing while it's running in the background, and my temps(even though my Vcore is set to 1.45) stay around a stable 68C while stress testing, and that's while doing the small FFT, while doing Blend, it's a stable 62C.(I just use fans to cool)

    I thought, after reading some tutorial, different forums posts, and such, from the net, that I could fry bacon on my PC running this test.


    Prime95 - Stress Test Your CPU-image.png
    running small FFT
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  6. essenbe's Avatar
    Posts : 12,697
    Windows 11 Pro
       #6

    Cliff the utility on the left side of that screenshot shows the multiplier at 41.
      My Computer

  7. Cliff S's Avatar
    Posts : 26,192
    Win11 Pro, Win10 Pro N, Win10 Home, Windows 8.1 Pro, Ubuntu
       #7

    essenbe said:
    Cliff the utility on the left side of that screenshot shows the multiplier at 41.
    That's what I mean, it doesn't use my full OC(49X)
    When I turn Prime95 off, or use another stress program at the same time, like CPU-Z it jumps to the correct 4.9:
    Prime95 - Stress Test Your CPU-image.png
    (CPU-Z & Prime95 small FFT running together while AIDA64, Skype Preview and Edge with 3 tabs open(and very well at that:))
      My Computers

  8. Cliff S's Avatar
    Posts : 26,192
    Win11 Pro, Win10 Pro N, Win10 Home, Windows 8.1 Pro, Ubuntu
       #8

    Here is a video showing what I mean:
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  9. Dude's Avatar
    Posts : 15,985
    Windows 11 Pro X64
       #9

    Cliff, is CIE disabled? That will cause it to drop too.
      My Computers


 

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