Windows 10: 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%.

:)

 

Task Manager High CPU Usage

I have the same problem myself with it only happens when I scroll through task manager and open and close it. I don't know this for sure but the reason this probably happens is that you may have a lot of processes running and task manager is using a lot
of the CPU to process the usage of each program.

What I have done is disable data that I don't need to see like network usage and GPU usage and it drops the CPU usage a bit. I have also enabled everything and scrolled up and down on it and task manager uses almost twice as much.

I would suggest disabling everything but CPU, disk, and RAM, (I would not suggest having GPU on because it is almost always at 99% unless you have FPS limits).

 

Task Manager showing incorrect CPU usage



After
I went from my Ryzen build to Z370 build, I noticed that Task Manager is showing CPU usage wrong.

While Task manager is showing me total CPU usage at 50%, Hwinfo is showing me about 25% total CPU usage.

You can also take a look at this picture: https://image.ibb.co/m0e4iR/wrong_cpu_usage.png

I'm also guessing that it have to do something with my Hyper-V that I'm running.

I'm using 2 CPU cores (out of 6 available from i5 8600k), and both of those cores should be at around 50% load in that Hyper-V machine. It's basically running one software and that's it.

Anyway, I don't know what else to make out of it, I guess someone from Microsoft will just have to take a look at it and release some patch in the future.

I'm using Latest 1709 version with all updates.

Build version: 16299.64

x64 bit

i5 8600k

Z370-G ASUS motherboard

 

high cpu usage when task manager is open

i am having issues with cpu usage when i bring up the task manger it shows that cpu usage is 59% with the task manager app using up 30-40% cpu usage in the performance tab it show that my cpu usage is at 80% usage but when using other programs to check
my temps and cpu load etc is shows low 20s when gaming this can pin the cpu up at 100% in task manger