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  1. #1
    ROG Member Array
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    May 2014

    Computer resetting suddenly on intense calculations (Rampage Extreme V/U3.1)

    Hello there:

    I bought a Rampage V Extreme to use it for scientific calculations. I installed Debian Jessie on it and I overclocked it to 4.4 GHz using the bios tool without changing any voltages manually and everything looked perfect for a while (until I ran a very intensive program). Now I'm facing a horrible problem when I do intense calculations. The computer suddenly restarts, and I find my system restarted with no errors or anything!

    I monitored the temperature while connected to that computer using SSH, and right before it crashed the temperature was about 79 C! Which is way below the critical limit!

    Now I opened the windows in my office, and it got colder (65 degrees C) and the computer ran also for another hour and crashed.

    And by the way `/var/log/syslog` doesn't say anything. It suddenly just starts over at some point with no clear errors.

    And I would like to point out that it's so unlikely that it's a Memory issue, because before starting this very intense CPU process, I did a RAM intesnse process for more than two weeks and it never crashed. The RAM was consistently filled all the time and yet the computer was stable.

    Why is this happening? I'm quite disappointed! Please help!

    The following are the output of `sensors` and `lscpu | grep MHz`:

    Physical id 0: +64.0°C (high = +87.0°C, crit = +105.0°C)
    Core 0: +64.0°C (high = +87.0°C, crit = +105.0°C)
    Core 1: +54.0°C (high = +87.0°C, crit = +105.0°C)
    Core 2: +64.0°C (high = +87.0°C, crit = +105.0°C)
    Core 3: +62.0°C (high = +87.0°C, crit = +105.0°C)
    Core 4: +60.0°C (high = +87.0°C, crit = +105.0°C)
    Core 5: +61.0°C (high = +87.0°C, crit = +105.0°C)
    Core 6: +57.0°C (high = +87.0°C, crit = +105.0°C)
    Core 7: +54.0°C (high = +87.0°C, crit = +105.0°C)

    CPU MHz: 4400.039
    CPU max MHz: 4400.0000
    CPU min MHz: 1200.0000

    The following are the specs of this computer:

    Rampage V Extreme/U3.1
    Intel 5960x @ 4.4 GHz
    Corsair Hydro Series H105
    64 GB RAM (8x 8 GB) @ 2133 MHz (not overclocked)
    Asus GTX 970 OC Edition
    Power Supply: XFX Pro Series Modular 850W
    3 HDDs
    1 SSD

    What would you do? How can you know why the system is restarting like this? Please advise.

  2. #2
    Moderator Array Nate152 PC Specs
    Nate152 PC Specs
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    Nate152's Avatar
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    Hello Samerafach

    Reset to default settings and run the cpu intensive application and see if it still shuts down. The shutting down is likely due to an unstable overclock or your psu can't cope under stress.

    When overclocking it's best to set the voltage manually.

  3. #3
    ROG Guru: Brown Belt Array MeanMachine PC Specs
    MeanMachine PC Specs
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    Apr 2014

    Hi samerafach

    I would suggest your problem is due to an OC instability and indeed the CPU could be throttling.
    As you have not mentioned any stress tests conducted, or indeed how you OCed the processor. It is advisable to determine stability under stress at stock frequency 3.5GHz before attempting 4.4GHz. Try lowering your frequency, although a good sample should attain 4.6GHz, it is not guaranteed.

    Conduct a stress test using Realbench or Prime95 whilst monitoring your temperatures with HWMonitor. Then report the results.

    Go here for a guide:

    Depending on the strength of your IMC (Integrated Memory Controller) will determine stability of the DIMMs you are using. Please mention exact specs. of your modules. Your DIMMs may be fine and may require slight increases to voltage or changes to frequency or timings. Please mention these Bios settings.

    Please report back.
    We owe our existence to the scum of the earth, Cyanobacteria

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  4. #4
    ROG Member Array
    Join Date
    May 2014


    Thank you for your response!

    But then isn't this Motherboard supposed to do this overclock for me automatically? I thought it would do it for me.

    Also the weird thing is that if the overclock is not stable, why isn't the Motherboard complaining (as usual) and saying "Overclock failed"? When does it say that and when does it not?
    Last edited by samerafach; 03-15-2016 at 12:33 AM.

  5. #5
    ROG Member Array
    Join Date
    May 2014


    Thanks for the info I'll try that and report.

  6. #6
    ROG Guru: Grand Master Array
    Join Date
    Oct 2012

    Confirm that you've populated the 8 pin power header on the motherboard and that you're running the latest BIOS for your motherboard. Clear your CMOS and test your system at stock defaults.

    Is that a single 64GB memory kit that you're running?

  7. #7
    ROG Member Array
    Join Date
    May 2014


    Thanks for the response.

    Is that a single 64GB memory kit that you're running?

    All pins are populated. I checked today and I'll double check in the morning. Even the other 4-pin slot is filled too.

    The BIOS is latest. I remember it's version 1902 from December 2015.

    Yes, the memory is one kit.

  8. #8

  9. #9
    ROG Member Array
    Join Date
    May 2014


    So I looked into details to my configuration.

    1- All pins are connected: 8+4.
    2- My memory is Corsair Vengeance 2133 MHz. Link:

    3- How I overclocked: I went to the bios, and there's an OC option "CPU Level". I chose 4.4 GHz, and it did auto-tuning.

    4- I started a Realbench test, I went to lunch, I came back, and the computer was frozen with a black screen. I restarted, and I got the message on bios "Overclocking failed".

    Now I have the latest bios: V2001.
    I tried to overclock manually according to the webpage you gave me, but I don't see the CPU multiplier ratio to be chosen. There's only the "CPU Level", which causes auto tuning regardless of what voltage I choose; and there's 4 options there only: 4.0 GHz, 4.2, 4.4 and Auto. My recent tries to reuse this options have failed. So now I'm going to switch to Windows to use Asus AI Suite to try to overclock. And then after it works, I'm going to increase the voltage to 1.3. Does that sound like a good plan?

    I would appreciate clear instructions on how to do the overclock the right way.

    Note: At home, I have Rampage 4 Extreme for gaming, and I overclock my 4930k to 4.5 GHz very, very easily using AI Suite 2 that I never worried about it... So this is pretty surprising for me. Nevertheless, I would like to try the "hard way" to overclock.

    Thank you.

  10. #10
    ROG Guru: Green Belt Array drop4205 PC Specs
    drop4205 PC Specs
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    Mar 2013

    clear cmos and go back into bios and run test at stock settings. If all ok back into bios and try xmp mode and run test. Manually setting the overclock is better than choosing cpu level up.
    Maximus XI Formula, I9-9900k, Phantex Evolove X, Seasonic Titanium 850W, Custom loop PE360+SE360 Rad, G.Skill Trident Z F4-3200C14 32g, Nvidia Reference RTX 2080 TI, Samsung 970 EVO Plus 1Tb, ROG Strix Flare keyboard, ROG Gladius II

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