GTX 1080 Ti PCIE 3.0 x16 vs PCIE 2.0 x16 test in 8 games at 1080p | TechPowerUp Forums
NVMe to PCIe Adapter x16, RIITOP M.2 NVMe SSD to PCI-e 3.0 x16 Adapter
Amazon.com: M.2 NGFF NVMe SSD to PCIE 3.0 X16/X8/X4 Adapter with heatsink for 1U/2U Server and Low Profile PC : Electronics
Amazon.com: NVME PCIe x16 Adapter, ELECTOP M.2 Key-M SSD to PCI 3.0 Express Expansion Card, Support 2230/2242/2260/2280 with Heat Sink, Compatible with Windows XP / 7/8 / 10 & MAC OS System : Electronics
What's the difference between PCI express 2.0 x16/2.0 x8/2.0 x4? | Tom's Hardware Forum