The Rock 5 B is not a Raspberry Pi killer—yet | Jeff Geerling
PCIe Slots: 1x PCIe 3.0 x16 | Number of USB ports: 5x USB Gen-2, 2x USB Gen-1. ... There are RGB lights underneath the PCIe slots for a little bit of colour flair.
PCIe 5.0 M.2 | Bo Mạch Chủ
Ultimate Scalibility: 2*PCIe 5.0 x16 slots for Multi-GPU and 4*PCIe 5.0/4.0 x4 M.2 slots.
What are the top uses of PCIe x1 Slots? – Premio Inc
PCIe x1 slots have only one PCIe lane. Despite having only one PCIe lane, PCIe x1 slots are useful for various lower-power PCIe peripheral cards. PCIe x1 cards can fit into all PCIe expansion slots, including x4, x8, and x16 PCIe slots. There are various peripheral cards you can use with PCIe x1 expansion slots.