NVMe max speed question

Hi there, does anyone know what are the max speeds for the onboard m.2 slots?

And when they state that it is 800MB/s for the 4x m.2 in the 7th expansion slot, is it per m.2 drive or is it an aggregate total speed? (ZimaCube - Personal cloud. Re-invented.)

Refers to a single m.2 drive on ZimaCube 7th Bay.