Okay, I've won this. For some reason, the power-saving settings were not applied. If someone encounters this issue, make sure you have High performance selected in Control Panel > Power Options > High performance.
Hello. After reinstalling Windows, the BIOS shows the processor frequency as 2.5GHz, and during stress tests and games, the frequency never exceeds 2.5GHz. I have tried changing power-saving settings in Windows, but it doesn't help.
Aurora R12, i9-11900K, stuck at 2.5GHz