Modern PCs provide plenty of metering and power-management options. Version 23.10 of the Genode-based Sculpt operating system makes these features available via an interactive user interface. One can watch the temperature of each CPU core, monitor the individual CPU frequencies, switch between power profiles, and reveal details about power draw.
Go to the download page to get started with Sculpt OS. It’s used as the day-to-day operating system by Genode developers, so it’s quite capable.