https://wccftech.com/playstation-5-cpu-clock-speed/

There's still a lot we do not know about the PlayStation 5 specs, but it seems like the CPU clock speed has been confirmed through somewhat roundabout means.

During EGX 2019 last weekend, it's been confirmed by Digital Foundry that the PlayStation 5 SoC supposed codenames Gonzalo, Oberon, and Prospero are indeed real. From tests that have surfaced online in the past few months, we can deduce that the console's CPU clock speed will be 3.2 GHz. Coupled with what we know about the CPU, such as the 8 cores and 16 threads, this means that the PlayStation 5 CPU will be quite good, especially compared to today's consoles and that it likely won't have trouble supporting full backward compatibility with the entire PlayStation library.