The PL1 is usually defined as the TDP of a processor. PL1 is the expected steady state power consumption of any processor (long term). Do note that Tau is not dependent on power consumption, nor is it dependent on the temp of the processor (because if the CPU hits a “thermal” threshold limit, then a different set of low voltage/frequency value curves are used and PL1/PL2 is discarded. It dictates how long a processor should stay in PL2 mode before hitting a PL1 mode, or before having to fall back to the “base” frequency. This feature overrides the PL1 variable (power level 1) on 65W non-K Intel Core processors, allowing the CPU to sustain a higher clock speed, once the Turbo Boost algorithm has dropped Tau. It works in a similar manner, and it appears that the motherboard vendor is actually increasing the processor’s PL1 (power level 1) from the default value to the maximum value, and locking it at that higher value. Now, ASUS seems to introduce a new feature called “ASUS Performance Enhancement” for the Intel 400-series chipset motherboards. This is similar to ASRock’s “ BFB technology” as I mentioned before in this article. ASUS calls this APE, or “ASUS Performance Enhancement” feature. It looks like ASUS is following ASROCK’s footsteps as the company just recently introduced a new feature to “boost” the clock speeds on non-K INTEL CPUs.
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