PCIE Sata expansion card riser card Adapter PCIe 2.0 x1 to 2-port SATA3.0 6Gbps | eBay
Amazon.com: GLOTRENDS Mini PCIe Extension Cable (23.6 Inch/60cm), Mini PCI-E to PCI-E X4 Riser Cable for PCIe WiFi Card, M.2 PCIe Card, Firewire Card, USB PCIe Card, Sound Card, etc (UEX105) :
All about PCIe (PCI Express) – Elgato
PCI Express Link Speeds and Bandwidth Capabilities - PCI Express 2.0: Scalable Interconnect Technology, TNG
Amazon.com: 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
PCIe Gen 4 vs. Gen 3 Slots, Speeds
hardware - Force renegotiation of PCI Express link speed? x2 card reverts to x1 width - Server Fault
FebSmart
How fast is PCI Express x16? - Quora
Will a 10Gb network card work at full potential even if the PCIe 3.0 allows for a maximum transfer speed of about 8Gb/s? - Quora
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. - Newegg.com