System reports excessive CPU activity.
System reports excessive CPU activity.
The issue likely stems from differences in how the tools report CPU usage. Task Manager may be overestimating due to background processes or system settings, while hwmonitor and rivatuner provide more accurate readings. Trust the detailed reports from the latter for a clearer picture.
6 cores with modest clocks—just rely on the task manager and be confident at 99%.
The Windows 10 Task Manager CPU Utilization data has been bugged for a long time. Surprising that more people have not noticed this bug. Here is an example. The TS Bench has loaded 4 threads which is putting a consistent 50% load on the CPU. Throw in another 1% CPU load for all of the Windows background tasks and ThrottleStop reports a total load of 51.0%. That is correct. The Task Manager is reporting CPU Utilization at 72%. I am not sure what that number means but it is not a good indication of the load on your CPU. In the Task Manager, click on the Details tab. On my laptop, it shows the correct 50% value for the TS Bench test load.
It seems the CPU is having trouble with both system tasks and gaming performance.
The TS Bench is progressing smoothly with 4 out of 8 threads active, maintaining a steady 50% load. The Task Manager Details section accurately reflects this. During the test, switching to the Performance tab shows an inaccurate CPU utilization rate of 72%. This figure remains consistent across all views. When examining per-core data, the same error persists. Adjusting for Turbo Boost reveals the correct calculation: a 51% actual load multiplied by (34/24) equals approximately 72%. The graphs displayed are misleading and should not be relied upon. The issue is evident with the low base frequency of the Core i5-8400, which contributes to this discrepancy. @Yuvraj Mann reported similar challenges.
They suggest focusing on two key points. The tab's title is Performance, which likely indicates what you're examining. Turbo boost isn't assured. Base clock provides a baseline, as long as electrical and cooling needs are satisfied. It seems logical for Microsoft to express CPU utilization in the Performance section as the ratio of the two clock speeds multiplied by the process's workload. Essentially, if the CPU runs at 50% more speed than the base, it handles roughly double the work. They also mention Microsoft may have stopped addressing confusion about percentages exceeding 100%, opting instead to show logical processor counts scaled to 100%.