I Built A PCIe 4.0 RAID Array - And It's STUPID FAST - YouTube
PCIe to 2x M.2 NGFF SSD + 2x SATA3.0 Hardware RAID Card RAID 0 1 10 and HyperDuo
StarTech.com - DUAL-M2-PCIE-CARD-B - M.2 PCIe SSD Adapter Card, x8/x16 to Dual NVMe/AHCI M.2 SSD, 2 Port - RS
HighPoint Releases the SSD7102: A Bootable Quad M.2 PCIe x16 NVMe SSD RAID Card
Sonnet M.2 4x4 PCIe Card for SSDs - Sonnet
Quad Slot M.2 NVMe PCIe 4.0 X16 Adapter Card with ASM 1184E Chip, Only Work with PCIe Splitter Function Motherboard
StarTech.com 2x M.2 NGFF SSD RAID Controller Card plus 2x SATA III Ports - PCIe - Two Slot PCI Express M.2 RAID Card plus Two SATA Ports (PEXM2SAT3422) : Electronics - Amazon.com
Amazon.com: ASUS Hyper M.2 X16 PCIe 3.0 X4 Expansion Card V2 Supports 4 NVMe M.2 (2242/2260/2280/22110) Upto 128 Gbps for Intel VROC and AMD Ryzen Threadripper NVMe Raid : Electronics