hardware - What's the bandwidth and form factor for PCIe x1 x4 x8 and x16? - Server Fault
PCI-Express X1 to Mini PCIe Wireless WLAN Adapter with 3.5 dBi SMA Antenna | GLOTRENDS
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Sintech PCI-E Express X1/UB to M.2 A/E Key Adapter Card with FPC Cable
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NVMe PCIe M.2 NGFF SSD to PCIe X1 4.0 adapter card with bracket WSA bhGHUKYHBT | eBay