ASRock Ultra Quad M.2 Card Review - 4 x M.2 SSD RAID at 10GB/s and 932K IOPS | The SSD Review
Amazon.com: Highpoint 4-Port M.2 SSD7505 PCIe Gen3/Gen4 NVMe Bootable RAID Controller for Windows & Linux Systems : Electronics
Quad M.2 NVME SSD to PCI-E 4.0 X16 Adapter, High Speed 4x32Gbps Soft Raid Card 696601690759 | eBay
HighPoint Releases the SSD7102: A Bootable Quad M.2 PCIe x16 NVMe SSD RAID Card
8-Port M.2 NVMe RAID Controllers Offer Up to 28,000 MB/s of Storage Bandwidth | Tom's Hardware
Dual M.2 PCIe NVMe Adapter Without PCIe Splitter Function (PCIe Bifurcation Motherboard is Required), Support M.2 PCIe 4.0/3.0 SSD Soft RAID Setup in Windows/Linux