I just acquired a Raspberry Pi 4 Model B with 4GB RAM. The processor stepping (revision) is B0 (the heat spreader says
2711ZPKFSB06B0T). It seems to be stable at 2.0 GHz with
over_voltage=6; it'll hang during stress tests at 2.15 GHz, and the Raspberry Pi OS desktop will not load at all at 2.2 GHz.
However, I've read that the Compute Module 4 and Raspberry Pi 400 use the C0 stepping of the BCM2711 (
2711ZPKFSB06C0T), which, among other things, runs cooler and has higher overclocking potential.
Aside from the performance and efficiency differences, are there any other differences between these steppings, such as processor errata fixes?