It's for pro-audio processing. Standard is that each "channel" gets its own core, until there's none left, then they have to share / wait. The more cores, the better. The ram is necessary to load the sample libraries. Ethernet isn't really required, except to process dante / rednet. But it has its own card for the audio transfer, (128x128 bidirectional channel matrix at 80usec port to port), so actual nic does very little work other than identifying devices, and assigning routes on the matrix.