Quad Port 10/100/1000Mbps Gigabit PCI-E NIC Network Card for PC, RTL8111H Chip, PCI-Express 2.0 X1, RJ45 LAN Port
Mini PCIe Extension Cable 23.6 Inch/60cm, Mini PCI-E to PCI-E X4 Riser Cable for BTC Miner Mining, WiFi Adapter, USB Adapter, M.2 PCI-E SSD Adapter, etc. Add-On Cards - Newegg.com
Amazon.com: MZHOU NVME M.2 SSD M Key to PCI-e 3.0 x1 Host Controller Expansion Card,Supports M2 NGFF PCI-e 3.0, 2.0 or 1.0, NVME or AHCI, M-Key, 2280, 2260, 2242, 2230 Solid State
Using 10Gb adaptor in PCIe 1x slot (An Unraid 10Gb journey) - Hardware - Unraid
PCIe (Peripheral Component Interconnect Express) | On the Motherboard | Pearson IT Certification
PCIe Gen 4 vs. Gen 3 Slots, Speeds
PCIe (Peripheral Component Interconnect Express) | On the Motherboard | Pearson IT Certification
Bus Speeds - Compare PCI vs PCI Express - NTI
Amazon.com: GLOTRENDS M.2 Extension Cable 23.6 Inch/60cm, NGFF M.2 Key M to PCI-E X1/X4 Riser Cable for PCIe WiFi Card, M.2 PCIe Card, Firewire Card, USB PCIe Card, Sound Card, etc (UEX108) :
GLOTRENDS M.2 PCIe X1 Adapter with M.2 Screw for M.2 PCIe 4.0/3.0 SSD (NVMe/AHCI Key M), PCIe X1/X4/X8/X16 Lane Installation, but Only PCIe X1 Bandwidth (PA09-X1) : Electronics - Amazon.com