C3 Transitions/sec is the rate that the CPU enters the C3 low-power idle state. The CPU enters the C3 state when it is sufficiently ...

C3 Transitions/sec is the rate that the CPU enters the C3 low-power idle state. The CPU enters the C3 state when it is sufficiently idle and exits this state on any interrupt. This counter displays the difference between the values observed in the last two samples, divided by the duration of the sample interval.