MiSTer FPGA Forum

Is there a script/command/utility I can run that will display how much RAM is detected/installed?

Yes, theres a core you can test the ram.

https://github.com/MiSTer-devel/Main_MiSTer/wiki

The icons in the main menu will show you how much memory

see https://misterfpga.co.uk/mister-fpga-me ... n-meaning/ for details

Note this wont show Dual Ram as thats too new a thing to be shown