CPU speed/multiplier wrong, running way slow (Win10)


  1. sremick
    Posts : 2
    Xubuntu
       New #1

    CPU speed/multiplier wrong, running way slow (Win10)


    This one has been kicking my butt for a while and I just can't seem to sort it out.


    Laptop is an HP 15-f039wm, running Win10 Home, with an Intel Celeron N2840 CPU:


    Intel Processor N2840 (1M Cache, up to 2.58 GHz) Specifications


    A while back (laptop isn't mine), the user noticed that it was now running very slow. Turns out the CPU speed is horribly lower than it should be. It's only running at 500 MHz (yes, 0.5 GHz) via a multiplier of 6x83.333 MHz even when under heavy load. I think the multiplier should be more like 26.


    The issue isn't hardware related at all: I can take a test HDD, put it in, set it up with a fresh Win10 install and the CPU is fine... idling low, but jumping up high all the way to rated speed under load. But I'd like to save this existing Windows/app environment if at all possible, and fix the issue surgically.


    I've tried updating the BIOS (there's also no BIOS settings worth anything or applicable as far as I can tell... it's pretty anaemic). I've also tried updating all the Win10 drivers HP has available for this model. No change.


    Any thoughts or advice?


    (My technical skill level is extremely high so feel free to ask me to do whatever or provide any info you need, without dumbing it down or painful hand-holding instruction.)
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  3. Vellinious
    Posts : 234
    8.1 / 10
       New #2

    No temp issues? CPU fan still working?
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  4. essenbe
    Posts : 12,801
    Windows 11 Pro
       New #3

    I'm not very good on laptops, but just a few thoughts.
    Are you sure it is not throttling because of heat?

    If you can do a clean install and it run right, there is obviously some software or driver causing your issue.

    Just to be certain, run performance tests and check disk on your hard drive. Also, maybe some good virus scans as well.

    Get rid of all the HP Crapware.

    Try setting the power options to High Performance. Go to the advanced power performance settings and set the Processor performance to minimum 5%, Max. 100% and cooling policy to Active. Power Plan Settings - Change in Windows 10 - Windows 10 Tutorials
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  6. RubberDucky
    Posts : 258
    Windows 10
       New #4

    Check the Windows power option, if it set to save power than that's what you expect from running that low.
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  7. sremick
    Posts : 2
    Xubuntu
    Thread Starter
       New #5

    Definitely not a heat issue. I had the laptop apart to swap the HDD and checked that. Also if it were that, it would've exhibited the same problem even with a fresh Win10 install on the test HDD.

    Power setting is set to "high performance" for testing already. I set the minimum and maximums to both 100% to try and forcing it.
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