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ThrottleWatch™ is a utility for detecting and reporting the CPU throttling activity in Pentium 4, Xeon, and Pentium M processors.
The amount of heat a CPU produces varies according to the processing load. In situations of high sustained load (such as performance benchmarks, etc...), a CPU may produce more heat than the cooling mechanism is capable of removing, and reach a high enough internal temperature to trigger throttling.
ThrottleWatch™ monitors and graphically displays both the CPU load and any throttling that occurs.
When ThrottleWatch™ is minimized, an icon is added to the system tray area of the Taskbar. The color of the icon changes when throttling is detected.
Types of CPU throttling:
TM1: "Thermal Monitoring 1" throttling is a feature of Pentium 4, P4 Xeon, Celeron ("Northwood" or "Prescott" cores), and Pentium M CPUs. TM1 throttling does not reduce the CPU clock speed - it inserts idle cycles into the instruction pipeline to reduce the processing load on the CPU, which in turn lowers the CPU temperature.
TM2: "Thermal Monitoring 2" throttling is a superset of TM1 and is used on LGA-775 versions of the Pentium 4 and Celeron processors and also on the Pentium M series of processors. TM2 reduces processor temperature by lowering the CPU clock multiplier, and thereby the processor core speed.
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