Adding PCIe To Your Raspberry Pi 4, The Easier Way | Hackaday
Pi+® (PiPlus®) M.2 PCIe NVMe Converter Adapter Expansion Card with Heat Sink for PCIE NVMe 3.0 x4/ x8/ x16 PCB with and Gel Pads.M Key Interface with Compatible with All Brand SSD :
PCIE LPCIeのレイアウトと配線のガイドライン | PCB設計ツール | アルティウム
Galax Goes White: A PCIe 4.0 2TB SSD with a White PCB