I believe the clock speed for the Raspberry pi is set for a default of
50mhz. The UHS cards can be safely increased to 100mhz and some of the
cards up to 203mhz. I just don't know if there are any issues for the
piCore architecture or any advantages to be had.

To change the clock speed for the SD cards:

# Overclock the SD Card from 50 to 100MHz
# This can only be done with at least a UHS Class 1 card
dtoverlay=sdtweak,overclock_50=100

I'm doing this on an 3B and a UHS1 card without any issue.

Howard

TinyTommy wrote: 
> OK, I'll bite.
> How on earth would you increase the 'clock of the SD card'?


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