What has caused my idle CPU temps to go up 20 degrees?

Discussion in 'Hardware Components and Aftermarket Upgrades' started by Prototime, Mar 21, 2018.

  1. Prototime

    Prototime Notebook Evangelist

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    Hi all, I'm hoping for some help figuring out why my idle CPU temps have increased drastically over the past couple of weeks. In the past, when I had a few tabs open in a browser and maybe Microsoft Word or another program open, my CPU temps would hover around 30 degrees C, and the Task Manager would indicate that my CPU usage was hovering between 1% and 4%. Now, the CPU temps hover around 50 degrees C in the same circumstances, and the Task Manager indicates that CPU usage is still consistently between 1% and 4%. Nothing has changed that I'm aware of.

    Any ideas on what could be causing this, and how to fix it?

    My laptop is an MSI GS43VR with an Intel Skylake i7-6700HQ CPU, nVidia Pascal 1060 GPU with 6GB VRAM, 16GB RAM, Intel Wireless 8260, and a 500GB Samsung 850 Evo SSD. The CPU and GPU were both pasted with IC Diamond Thermal Compound by the reseller when I purchased it back in August 2016.

    Thanks for any help you can offer!
     
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  2. hmscott

    hmscott Notebook Nobel Laureate

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    It's probably the power plan changed from Balanced to High Performance, or some other update / change is causing the CPU to not down clock when idle. Check your power plan, make sure it is set to Balanced, and go into Advanced and set the CPU to 0%/100% to get the full range of CPU frequency cycling.

    You did mention paste, so it could also be paste drying out..., but look for OS changes / updates, power plan (slider?) changes first.
     
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  3. bennyg

    bennyg Notebook Deity

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    No change in load but a change in temps sounds like the year and a half old paste is going bad

    Load temps should be through the roof compared to where they used to be if it's paste. If it's just a setting issue 100% load should be no hotter than before

    Paste drying out and getting hotter is a chicken and egg thing so it'll keep getting worse if that's what's going on.
     
  4. Vasudev

    Vasudev Notebook Prophet

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    I think its Win 10 scheduled tasks for OS servicing. Use Dism++ to cleanup older SxS files incl. WinSxs temps and backups too.
     
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  5. Papusan

    Papusan JOKEBOOKS = That sucks!! STAHP! Dont buy FILTH...

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    Read OP's post one more time....

    "my CPU temps would hover around 30 degrees C, and the Task Manager would indicate that my CPU usage was hovering between 1% and 4%. Now, the CPU temps hover around 50 degrees C in the same circumstances, and the Task Manager indicates that CPU usage is still consistently between 1% and 4%. Nothing has changed that I'm aware of.":rolleyes:

    OP should apply new thermal paste!!
     
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  6. Vasudev

    Vasudev Notebook Prophet

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    W10 now can run apps/tasks in background with lowest priority.
    Probably repaste is required.
     
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  7. Papusan

    Papusan JOKEBOOKS = That sucks!! STAHP! Dont buy FILTH...

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    1 up to 4% with apps/tasks running in the background is normal. If Win 10 run scheduled tasks the processor load in % will increase a lot more than this. So yeah, a repaste is needed.
    upload_2018-3-23_17-49-9.png
     
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  8. Prototime

    Prototime Notebook Evangelist

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    Thanks, everyone. There may be a few contributing factors: for some reason my power plan was changed to "Movie," and after changing it back to "Balanced", and setting the CPU to 1-100% per @hmscott 's suggestion, my CPU does seem to run about 5 C cooler, but that's still about 15 degrees above what it used to be. I'm going to look into doing a repaste--I've never done one before, but I'm willing to take the plunge if it means a cooler and longer-lived CPU.
     
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  9. hmscott

    hmscott Notebook Nobel Laureate

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    Did you undervolt yet?, if you did before the Windows Update, your undervolt may need to be refreshed - XTU doesn't like MS's Windows 10 SoftShutdown and thinks a crash or other non-standard shutdown was done - and coming out of Sleep the undervolt might not stay applied.

    Most CPU's can take a -100mV undervolt, so I suggest trying that first. That's usually enough to get 100% load temps down 10c.

    If you can do more, as some have gone as high as -220mV - average I've seen is -140mV.

    If -100mV isn't stable, try -50mV and go up / down from there.

    That may not help much with Idle, but it will help with load temps. :)

    I hate to suggest people pull apart their laptop, but you already did it once, so it's probably just time to refresh the paste. So consider changing pastes, and technique of application.

    Generally letting air in is bad, so keep the spill over to a minimum, I usually use an Xacto knife to clean an edge around the CPU so pressure won't gish out paste open to the air.

    Too thick pads can make it so you can't tighten down evenly and an edge can be open to air.

    Good luck :)
     
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  10. Prototime

    Prototime Notebook Evangelist

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    Sorry for resurrecting this thread, but I finally was able to repaste the CPU (and GPU), and it's still having the same problem: high CPU idle temps, roughly 15-20 degrees C higher than they used to be. I cleaned off the old, dry IC Diamond and replaced it with a thin layer of Kryonaut Thermal Grizzly. I also dusted out the fans and around the heat pipes (though there wasn't much dust).

    Even after this, I'm still seeing idle CPU temps in the 45 - 50 C range when they used to hover around 30 C. Again, there has been no change in CPU load (1% to 4% while idle). Also, I didn't mention it in my original post, but my CPU Cache and Core are undervolted -169.9 mV, iGPU and System Agent undervolted -125 mV using ThrottleStop (and they have been undervolted since around the time I purchased the notebook in August 2016). I've updated the graphics drivers for both the iGPU and the dGPU, I'm current on Windows Updates, and I even updated the BIOS, hoping for a fix - still the same issue.

    And strangely, when the system is not idle and I'm running something like Firestrike or Unigine, it typically has respectable CPU temps in the mid-50s C. (If anything, the repaste might actually have slightly brought down my gaming temps... but it didn't change my idle temps)

    Any other thoughts on what this might be, or what I might be able to do to troubleshoot? Thank you!
     
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