GLOTRENDS 4 x M.2 PCIe 4.0/3.0 X16 Adapter, Support 4 x M.2 NVMe SSD RAID-on-CPU (VROC) in Intel Platform and PCIe 4.0 NVMe RAID in AMD Platform, PCIe Bifurcation Motherboard is Required (
Highpoint Updates NVMe RAID Cards For PCIe 4.0, Up To 8 M.2 SSDs
I Built A PCIe 4.0 RAID Array - And It's STUPID FAST - YouTube