Windows 10: Task Manager reporting 100% CPU Usage

So very recently my task manager has started reporting that my CPU has 100% usage all the time even when idle, Then it will drop to around 25% but shoot back up again way above what it actually is. However I know that this is not the case. This is because I have 3 other monitoring programs that all report around the same as each other around 3-8% when idle where as task manager is reporting 100%. I have already run SFC /scannow and DISM /Online /Cleanup-Image /RestoreHealthDoes. Does anybody know why this happens and how to fix it?

:)

 

CPU constantly at 100% in task manager

It was yeah. Hasn't changed *Sad Ah well I really appreciate the suggestions. Thanks very much.

 

100% CPU usage in task manager after upgrading to W10

Thank you Krishna for quick response however it is neither of those reasons. I think it is a bug, it only shows 100% cpu usage but everything works ok . Never had this issue before only started after i updated from windows 7 to 10. The procantage usage
of cpu on some applications jumps from 5 to 70% in example : the task manager was "using" 80% of cpu and that just can't be right. Having said that i think the task manager's cpu usage shows wrong data (its bugged) somehow.

 

Task Manager Incorrect CPU Usage

So for roughly the past couple of weeks, I have been having issues with task manager giving me incorrect readings on the CPU usage. Before noticing this issue, I have been running my 9900K at 4.8 GHz all core with an AVX offset of 1. Initially, reducing
my clock speed by 100 MHz down to 4.7 GHz all core (AVX offset 0) solved the problem for a couple of weeks, but the problem has now resurfaced despite the CPU literally running at specified stock speeds.

The Task Manager program is incorrectly reporting CPU usage spiking up to 100% at times, sometimes accompanied by the display turning into a black screen for a half-second while playing SCP: Secret Laboratory. Meanwhile, other programs that were running
at the time such as Google Chrome or DIscord turn into black windows and require restarting. Other programs such as HWiNFO64, Corsair iCUE, and Process Explorer are reporting much lower CPU usage percentages.

Any ideas on what is causing Task Manager to behave like this? I thought Windows shipped out an update that fixed the broken Task Manager, but apparently not for me. I have already tried a clean installation of Windows 10 Pro to no avail.

CPU: i9-9900K @ 4.7 GHz all core

RAM: 4x8 GB @ 3200 MHz, XMP I

Motherboard: Asus ROG Maximus XI Formula, BIOS - American Megatrends Inc. 0905, 4/10/2019

Windows 10.0.17763 Pro Version 1809

OS Build 17763.437

Full Desktop Parts List: https://pcpartpicker.com/list/Cz87LJ





This was taken while running a game (SCP: Secret Laboratory, SCPSL.exe). Something seems off with the process explorer too since the game should be the highest in CPU usage, and the CPU use of the processes don't add up to 100%. I have seen this occur when
the computer freezes for a half-second for no apparent reason.





This was also taken while running the same game mentioned above, except this time only the Task Manager is reporting an incorrect CPU usage while Process Explorer says otherwise.





This image shows Task Manager claiming that the CPU frequency is being throttled to 3.6 GHz. CPU-Z is reporting a clock speed of about 4.7 GHz. Task Manager also seems to think CPUs #8 and #9 (starting from #0) are going crazy. I've checked both CPUs in
HWiNFO64 and Process Explorer and found nothing wrong with them.





This image is another example of incorrect CPU usage where the actual CPU usage is much less than 50%.