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A good temperature for your desktop computer's CPU is around 120℉ when idle, and under 175℉ when under stress.
When the CPU is idle, it will draw far less than the typical thermal power. Datasheets normally contain the thermal design power (TDP), which is the maximum amount of heat generated by the CPU, which the cooling system in a computer is required to dissipate.
ACPI 1.0 (1996) defines a way for a CPU to go to idle "C states", but defines no frequency-scaling system.. ACPI 2.0 (2000) introduces a system of P states (power-performance states) that a processor can use to communicate its possible frequency–power settings to the OS.
The computer is running and the CPU executes instructions. "Away mode" is a subset of S0, where monitor is off but background tasks are running. G1 Sleeping S0ix Modern Standby, [34] or "Low Power S0 Idle". Partial processor SoC sleep. [35] [36] Sub states include S0i1, S0i2 and S0i3. Known to ARM and x86 devices. S1
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Idle is a state that a computer processor is in when it is not being used by any program. Every program or task that runs on a computer system occupies a certain amount of processing time on the CPU. If the CPU has completed all tasks it is idle. Modern processors use idle time to save power.
TM2 reduces processor temperature by lowering the CPU clock multiplier, and thereby the processor core speed. [2] In contrast, Thermal Monitor 1 inserts an idle cycle into the CPU for thermal control without decreasing multipliers. TM1 and TM2 are associated with DTS/PECI — Digital Temperature Sensor/Platform Environment Control Interface. [3]