Asus RS500-E9 Series User Manual page 74

16. M.2 (NGFF) connectors (NGFF1-2)
These connectors allow you to install M.2 devices.
This connector supports type 2242/2260/2280/22110 devices on both PCI-E and SATA
interface.
The M.2 (NGFF) device is purchased separately.
17. Mezzanine PCIE card connectors (MEZZPCIE1-2)
The MEZZPCIE1-2 connector supports Open Compute Project (OCP) cards.
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Chapter 4: Motherboard Information