default speed of the RPI4 and RPI5

[wmjenkinson]

Hi rsta2, what is the default speed of the processors for the RPI4 and RPI5?
Also, does the RPI4 support USB Sound?

Thanks.

[rsta2]

The boot CPU clock rate is 600 MHz for the RPi 4 and 1500 MHz for the RPi 5. With the class CCPUThrottle this can be speed up, but you will need a heat-sink and maybe a fan then. Yes, the RPi 4 supports USB sound, but there are only a few interfaces reported to work so far: https://github.com/rsta2/circle/wiki/Device-compatibility-list