simply put - a remote PCIe board, the host and the remote are isolated completely using optical technology. For CAS, there is no need to optimize the computer with better SATA cables, LPS for 3.3V/5V/12V..., fan filter, power filter, fanless, etc
put the left board alone in a case, like below (you can get the case something better)
use something like pico-psu together with a linear PSU (LPS) for power
then add a sotm usb card to the PCIe slot and connect to an external DAC
-why?
because the hardware is on its own with LPS and is isolated from the musical software player computer, the connection is thru the orange optical cable