[adrian_b]

The previous generation of Intel and AMD CPUs could not consume more than 20 to 30 W with a single active core (non-overclocked).

So with the power limit set to 65 W or more the single-thread performance was always limited by the maximum turbo frequency (which may depend on the temperature of the CPU) and never by the power limit.

I have not seen yet any published value about the single core power consumption of Zen 4, but it is likely that the single core power is not higher. It is certainly much less than 65 W even at 5.85 GHz.

So the expected behavior is that the single-thread performance does not depend on whether you set in BIOS the steady-state power limit to 170 W, 105 W or 65 W. Only the multi-threaded performance is modified by the power limit, because when the power limit is reached, the clock frequency is decreased until the power consumption matches the limit.