Windows 10: Task Manager showing Intel Core i5-2500K operating at 5.29GHz??

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  1. bobjoe's Avatar
    Posts : 234
    Windows 10, 8.1, 7, and Vista
       15 Nov 2015 #1

    Task Manager showing Intel Core i5-2500K operating at 5.29GHz??


    Since I skipped Windows 8, I didn't get to use its new task manager.

    But now that I'm on 10, I'm heavily enjoying this AMAZING new task manager.

    However, I just noticed (not sure how I didn't see this before) that Task Manager is showing that my i5-2500K is running at 5.29GHz! I do have it overclocked to 4.2GHz @ ~1.31 volts. Does anyone know why this might be happening? I searched around a bit and I found that some other people have this problem with the i5-2500K and the Task Manager, but nobody really knows what it is.

    Is this just Intel trying to get us to buy their new processors?

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  2.    15 Nov 2015 #2

    That's funny - it's interesting that that it gets the "max speed" right, but the current speed so badly wrong.

    My Win 10 TaskMgr is also getting my actual cpu speed wrong, but in the opposite direction.

    I've got a trusty old I7-920 running at 3.5 (20 x 175) and from the speed ranges I'm seeing it's obvious that Win10 TaskMgr is not reading (or maybe not even attempting to read) the bus speed correctly. In my case it seems to be assuming that the bus speed is always stock (133) and the multiplier is fluctuating normally (12-20) with cpu utilization.

    If TaskMgr is similarly misreading the bus speed on your system (and again using say 133 rather than 100), then with a multiplier of say 42 at full utilization it would read 5.5Ghz-ish. I think that sort of fits with what what you're seeing (given that in the graph you're on the way down from a 100% cpu spike)?
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  3.    15 Nov 2015 #3

    Mine is also doing the same with my i5-3550 says max speed is 3.79 GHz but reports 3.89 GHz.
      My ComputerSystem Spec

  4.    15 Nov 2015 #4

    Don't trust the numbers on it. My i5-4300U says Max speed is 2.5 GHz, but task manager reports 2.9 GHz for 1 Core and 2.6 GHz 2 core loads.
      My ComputerSystem Spec

  5. Dude's Avatar
    Posts : 12,209
    Windows 10 Pro X64
       15 Nov 2015 #5

    I have had mine show weird numbers too/ Mine is OCd to 4.5

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  6. bobjoe's Avatar
    Posts : 234
    Windows 10, 8.1, 7, and Vista
    Thread Starter
       15 Nov 2015 #6

    Hmm, interesting.

    Perhaps it only happens on older processors? I'm not seeing any 5th generation or 6th generation Core i5s or i7s with this problem
      My ComputerSystem Spec

  7.    15 Nov 2015 #7

    Dude said: View Post
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    Nice Phase Change Cooling System :)
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  8.    15 Nov 2015 #8

    Intel processors have a "Turbo" function, which can temporarily increase the CPU speed (there is also the speedstep function which can drop the speed). It's likely that the code that calculates this can't quite get a read on the actual numbers because it's constantly changing.
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  9. bobjoe's Avatar
    Posts : 234
    Windows 10, 8.1, 7, and Vista
    Thread Starter
       15 Nov 2015 #9

    Mystere said: View Post
    Intel processors have a "Turbo" function, which can temporarily increase the CPU speed (there is also the speedstep function which can drop the speed). It's likely that the code that calculates this can't quite get a read on the actual numbers because it's constantly changing.
    I'll have to try disabling Intel EIST and Turbo Boost. Thanks for the info
      My ComputerSystem Spec

  10.    15 Nov 2015 #10

    I wouldn't do that. You are wasting energy by clocking at unnecessary frequency without a load. It's like going back to Pentium 4 days where you can literally heat your room by just idling.
      My ComputerSystem Spec


 
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