Recently while troubleshooting my PC I suspected a CPU bottleneck, and I was monitoring CPU usage using AB/RTSS OSD. The OSD, AB monitors, HWInfo, HWMonitor, pretty much everything was telling me that my CPU was sitting at around 80%. By chance, I looked at task manager during the load, and it was reading 100%. Switching to any of the other monitors, I noticed that they all still said around 80%. Looking into this further, it seems like this may actually be a windows bug/feature. In Windows' Task Manager, I can see a similar discrepancy between the reported CPU utilization, and the CPU Idle process. For example, if the CPU usage is at 4% (idle) the Idle Prcoess reports 99% usage. Obviously, this doesn't add up. It appears (I may be wrong about this!) that all of the monitoring apps I've used (AB,HWInfo, HWMonitor, etc) are reporting the CPU usage as (100 - Idle Process Percentage) ... Which isn't really very accurate at all. Any advice on how to deal with this? Win10 FCU, latest AB/RTSS/other monitoring apps. I noticed the same issue with Win10 CU.