16.
M.2 (NGFF) connector (NGFF1)
This connector allows you to install an M.2 device.
This connector supports type 2242 devices on both PCI-E and SATA interface.
The M.2 (NGFF) device is purchased separately
17.
Mezzanine PCI card connector (MEZZ1)
The MEZZ1 connector supports Open Compute Project (OCP) cards.
ASUS RS520-E8-RS8, RS520-E8-RS12-E
4-17