3900X
3900X
The fluctuating core speeds you see are common due to BIOS settings and system load. It’s not necessarily abnormal, but stability depends on your hardware and usage. You can try adjusting the CPU frequency settings in BIOS or using tools like CPU-Z to monitor and balance performance. Overclocking isn’t always required unless you need higher performance.
It seems you're suggesting that when the system is idle, it behaves as expected.