According to a prominent chipset leaker, the impending Ryzen 5 5600X APU has been overclocked to just over 6.0GHz. This is shown in a set of CPU-Z detection results that appear to confirm the processor can indeed be pushed this far. The new leak comes in a wave of others showing the new 5-series in a good light compared to its Intel rivals.
https://www.notebookcheck.net/AMD-s-Ryzen-5-5600X-is-allegedly-spotted-running-at-6GHz-via-CPU-Z.501631.0.html