AMD PBO is AMD's way of safely overclocking your CPU processor. It is done automatically. The Processor will overclock when it is needed to give the extra boost when a program demands it.
From PCGAMER TEch site:
Does PBO overclock?
PBO is an automatic overclocking scheme that pushes the power budget of the chip for a boost to performance. It's been the preferred way of getting a bit more performance out of AMD's chips for the last couple of generations, and the fact it's not available here is somewhat surprising.Apr 14, 2022
If you want to overclock your Processor to 5Ghz make sure you have a CPU Cooler that can keep your processor from overheating.