Windows Defender scan overheats my computer

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  1. Posts : 939
    Microsoft Windows 10 Professional (x64) Build 19045.2846
       #1

    Windows Defender scan overheats my computer


    I use the Core Temp utility. The full scan always brings the cpu hovering around the 100% range, but today, while running a full scan, first time in five years Core Temp gives me a notification that cpu temp is 68C, which is over the specified threshold. After scan now 31C.

    Any guess why now? Firefox running, nothing else.
      My Computer


  2. Posts : 2,098
    Windows 11 Pro (latest update ... forever anal)
       #2

    Defender scan may just be symptomatic of some other (technical/hardware) underlying problem(s).

    You need to test it against other resource-intensive functions.
      My Computers


  3. Posts : 685
    Windows 10 Pro 64-bit
       #3

    I don't have an answer for you, but on my three PCs a full Defender's scan always kicks my fans on high for like an hour, and I can still feel very warm/hot cases. I close everything, and let the scan run until completion without doing anything. I only remember once that I received a heat warning when I used to run a full scan, but kept doing things, so now I just stop all that I'm doing for the scan to do its thing. Maybe schedule the full scan in the middle of the night when you wouldn't need to be on the PC.
      My Computer


  4. Posts : 22,756
    Win 10 Home ♦♦♦19045.4123 (x64) [22H2]
       #4

    kitpzyxmsir said:
    I use the Core Temp utility. The full scan always brings the cpu hovering around the 100% range, but today, while running a full scan, first time in five years Core Temp gives me a notification that cpu temp is 68C, which is over the specified threshold. After scan now 31C.

    Any guess why now? Firefox running, nothing else.



    I think you are confusing a TDP of 65w with maximum temperature.

    The maximum temperature of an Intel Core i5 6500, is 95 to 100C.
    That CPU should be able to run happily at say... 80C all day long.
    Last edited by Ghot; 10 Mar 2021 at 01:45.
      My Computer


  5. Posts : 939
    Microsoft Windows 10 Professional (x64) Build 19045.2846
    Thread Starter
       #5

    Ghot said:
    I think you are confusing a TDP of 65w with maximum temperature.

    The maximum temperature of an Intel Core i5 6500, is 95 to 100C.
    That CPU should be able to run happily at say... 80C all day long.
    "What's the max temp" is the question I should have asked in the first place.

    Thanks
      My Computer


  6. Posts : 22,756
    Win 10 Home ♦♦♦19045.4123 (x64) [22H2]
       #6

    kitpzyxmsir said:
    "What's the max temp" is the question I should have asked in the first place.

    Thanks


    As computers run, over time, they will do things like collect dust, thermal compound may dry out, etc.
    Generally, it is the slow accumulation of dust that causes temps to rise a bit.

    You can use canned air or an oil-less compressor to blow the dust out.
    Thermal compound should last a while before needing to deal with that. And if the TC has problems, then temps will rise a bit higher, and just on the CPU.
      My Computer


  7. Posts : 31,239
    10 Home x64 (22H2) (10 Pro on 2nd pc)
       #7

    kitpzyxmsir said:
    ...Core Temp gives me a notification that cpu temp is 68C, which is over the specified threshold...
    Where are you getting this 'specified threshold' from?

    If this is the Intel Core i5 6500 @ 3.20GHz Skylake in your specs, then Intel specify TCASE 71C
    TCASE
    Case Temperature is the maximum temperature allowed at the processor Integrated Heat Spreader (IHS).
    Intel(R) Core i5-6500 Processor (6M Cache, up to 3.60 GHz) Product Specifications

    But the case temperature is not what Core Temp reports. What you see in Core Temp is the Junction temperature, the internal temperature of the CPU. Core Temp should also tell you the Tj.Max for your CPU, the specified maximum junction temperature.

    Windows Defender scan overheats my computer-core-temp.png

    For the i5 6500 Tj.Max should be 100C. A safe operating temperature is generally regarded as anything 10C or more below your Tj.Max.

    max junction temperature ... 100 C
    Core i5-6500 - Intel - WikiChip

    If you are getting close to your Tj max, especially if it occurs more so recently, then it is probably time to clean out the dust from your fans.
      My Computers


  8. Posts : 6,201
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #8

    Open the computer case and inspect the heat sink. It can be clogged with dust.
    Is your CPU fan running and speeding up as it gets hotter?
    On BIOS you probably have a CPU fan setup. Is it set to normal?
      My Computers


  9. Posts : 939
    Microsoft Windows 10 Professional (x64) Build 19045.2846
    Thread Starter
       #9

    Ghot said:
    You can use canned air or an oil-less compressor to blow the dust out.
    Yes. I've got this great little Coleman handheld 120v compressor. Use it about once a month.

    Bree said:
    Where are you getting this 'specified threshold' from? For the i5 6500 Tj.Max should be 100C. A safe operating temperature is generally regarded as anything 10C or more below your Tj.Max.
    My Tj.Max is 100C. Naturally, I was concerned about that alert, but since that warning is set to go off at 68C, this was this first alert I've seen, and I've got some distance between that and the 90C vicinity, I feel more comfortable about things. But I still want to know why it happened now after so much time.

    Have you got Core Temp displayed in the taskbar area? Also suddenly, that taskbar icon shrunk to about 1/3 it's size. Do you know how to re-size it? Nothing I try works.

    Megahertz said:
    Open the computer case and inspect the heat sink. It can be clogged with dust.
    Is your CPU fan running and speeding up as it gets hotter?
    On BIOS you probably have a CPU fan setup. Is it set to normal?
    I'll check it out. I'll concentrate on the heat sink.




      My Computer


  10. Posts : 1,928
    Windows 7 Home Premium x64
       #10

    kitpzyxmsir said:
    I'll check it out. I'll concentrate on the heat sink.
    what kind of CPU heatsink do you have?

    it should be copper or better

    perhaps replace the CPU cooler/heatsink with a liquid cooler - maybe expensive but should help out bigtime when using modern power hungry Intel/AMD CPUs
      My Computers


 

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