Configurable TDP:
Configurable TDP (cTDP), also known as programmable TDP or TDP power cap, is an operating mode of later generations of Intel mobile processors, as of January 2014, and AMD processors, as of June 2012, that allows adjustments to their TDP values. By modifying the processor behavior and its performance levels, power consumption of a processor can be changed by altering its TDP at the same time. In this manner, a processor can operate at higher or lower performance level, depending on the available cooling capacity and desired power consumption.
Some Intel processors support cTDP, providing three operating modes:
• Nominal TDP – this is the processor’s rated frequency and TDP.
• cTDP down – when a cooler or quieter mode of operation is desired, this mode specifies a lower TDP and lower guaranteed frequency versus the nominal mode.
• cTDP up – when extra cooling is available, this mode specifies a higher TDP and higher guaranteed frequency versus the nominal mode.
Some mobile Haswell processors support cTDP up, cTDP down, or both modes.
Another example, some of the AMD Opteron processors with Kaveri APUs can be configured for lower TDP values. IBM’s POWER 8 processor implements a similar power capping functionality through its embedded on-chip controller (OCC).
VisualSim can model these CPU power states with the Power_Manager as the baseline block.
Web: https://en.wikipedia.org/wiki/Processor_power_dissipation