If you do not like the C states, you can use the Windows Balanced power profile with the Minimum processor state set to a low number like 5% so you can watch your CPU slow down when idle. will all be reduced anytime the CPU is not fully loaded. For most workloads, an 8 core CPU does not need to have 8 cores active simultaneously so why not let the CPU manage itself and effectively turn off inactive cores. Most enthusiasts do not understand C states so they usually disable them. When a core has nothing to do, it is automatically disconnected from the voltage rail and disconnected from the internal clock so the core will be running at 0 MHz and 0 Volts. In this state, when a CPU core has something to do, it runs at full speed. The easiest way to minimize power consumption and stress is to enable the C7 C state. Monitoring software or a graph that is sampling the CPU once per second is meaningless. When a CPU is lightly loaded, depending on how Windows is setup, the multiplier can be changing hundreds or thousands of times per second. The way this works is all active cores at any instant in time are all locked to the exact same multiplier. After you boot up, then your Windows settings will take over. A different motherboard or different bios version is not going to change anything. You might not like this but your CPU is running exactly as Intel designed it to run. The energy saving features are disabled when you are in the bios.
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