PCIe 4.0 Card Hosts 21 M.2 SSDs: Up To 168TB, 31 GB/s | Tom's Hardware
The Samsung 980 PRO PCIe 4.0 SSD Review: A Spirit of Hope
Amazon.com: Quad NVMe PCIe Adapter, RIITOP 4 Ports M.2 NVMe SSD to PCI-e 4.0/3.0 x16 Card with Fan Support 2280/2260/2242/2230 NVMe SSD (PCI-e Bifurcation Required) : Electronics
Amazon.com: M.2 NVME SSD to PCIe 4.0/3.0 x4 Adapter, M.2 2280 2260 2242 2230 SSD to PCIe 4.0/3.0 x4 Host Controller Adapter Card with Aluminum Heatsink for PC Desktop with Full Speed : Electronics
PCI-E 4.0 4x4 to M.2 4-Bays Expansion Card for M.2 NVMe Solid State Drive 2242 2260 2280 SSD PCIe X16 4.0 Gen 4 Adapter Card - AliExpress