BCM RX680R - PCI Express X4 Slot; Connector

RX680R User’s Manual
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1.5.4 PCI Express x4 slot
This motherboard supports one PCIe x4 slot that complies with the PCIe x4 specifications.
1.5.5 M.2 connectors
Support PCIe, SATA and USB interface of this connector.
M2M1:
M.2 2242/2280/22110 M Key NVMe
(Gen4 PCIe x4 + SATA III)
M2M :
M.2 2242/2280/22110 M Key NVMe
(Gen3 PCIe x4 + SATA III)
M2E :
1 x M.2 2230 E Key with CNVi Support
(PCIe x 1 + USB 2.0)
PCIE_X4_Slot2:
Gen 3 PCIe x4 Open Ended