The i9-powered laptop fails to deliver enough performance for CPU-intensive tasks which it should be handling with ease under ideal circumstances. The highest-end MacBook Pro’s performance seems to be hit the hardest. Instead, the tech giant seems to have throttled the performance on the premium laptops causing massive performance drops. Starting with version 3.5 and going forward, only the 64-bit version and Windows 8 will be. The new quad-core and six-core Intel CPUs that the Apple laptops come with require more power, but Apple did not change the hardware chassis on its lineup of laptops to account for better airflow. Windows 7 and 32-bit versions of the Intel Power Gadget for Windows has ceased development from 3.0.7. The Windows and Linux versions of the app are still available for download. Please note that Mac App Store version of iStat Menus does not contain frequency. However, the tool is available through third-party mirror links if you want to try it out. please download and install Intel Power Gadget, then restart your Mac. It is supported on Windows and OS X, and includes an application, driver, and libraries to monitor and estimate real-time processor package power information in watts using the energy. The Intel Power Gadget for MacOS was taken down from the official Intel website recently with no official explanation whatsoever. Intel Power Gadget version 3.5.5 Intel Power Gadget is a software-based power-usage monitoring tool enabled for 2nd-generation Intel Core processors or later.

This thread is asking about M1 iMacs (which, of course, are most assuredly not Intel processors.) Power Gadget can't run on M1, AFAIK. And, pretty much follows from the chart on that Apple support page.

Users found out that the clock speeds on the latest MacBook Pros go as low as 800 Mhz to maintain core temperatures. Your 2020 iMac would be an Intel processor, and the 120-160w looks reasonable for that processor. The latest-gen MacBook Pros from the 2018 lineup are seemingly throttled according to many users who used the Intel Power Gadget to identify the CPU frequencies.

Mac intel power gadget