CPU Physical Usage

This sensor reports the utilization of all processors installed in the system.
The measurement is based on a percentage of the maximum compute capacity of the processor.
It considers how slow or fast the processor runs when doing work.
This measurement might differ from the values that some operating systems report for utilization, which is often calculated by how often the processor is not idle.

Memory Bus Usage

This sensor reports the utilization of the total bandwidth of the memory bus.
The measurement is based on a percentage of the maximum memory bandwidth of the configuration.
This measurement might differ from the values that some operating systems report for memory utilization, which is often calculated by how much of the available system memory is being used or allocated.

I/O Bus Usage

This sensor reports the utilization of all processors connected to I/O buses (total PCI-e bus bandwidth).
The measurement is based on a percentage of the maximum total bandwidth of these buses.
This measurement is not an indication of how busy an I/O device might be, but rather how much PCI-e bandwidth the device is using.