The Dell 4x m.2 PCIe x16 version of the HP Z Turbo Quad Pro
Amazon.com: SIIG M.2 NGFF SSD (M Key) to PCIe 3.0 x4 Card Adapter For 2230, 2242,2260, 2280 M.2 PCIe Host Controller Expansion Card SSDs NVMe or AHCI (SC-M20014-S1) : Electronics
Amazon.com: Sintech M.2 NGFF Key M to PCIe 4X SSD Adapter Card,Nvme to PCI-e 3.0 PCI-Express 16X Riser Extension Cable 20cms for Graphics Card : Electronics
NeweggBusiness - Dual M.2 PCIe 4x Adapter for SATA or PCIe NVMe SSD with Heatsink, RIITOP M.2 SSD NVME (M Key) and SATA (B Key) 22110 2280 2260 2242 2230 to PCI-e
Quad Slot M.2 NVMe PCIe 4.0 X16 Adapter Card with ASM 1184E Chip, Only Work with PCIe Splitter Function Motherboard
Quad NVMe PCIe Adapter, RIITOP 4 Ports M.2 NVMe SSD to PCI-e 4.0/3.0 x
U-Reach M.2 NVMe to PCIe Adapter - M.2 M Key to PCIe 4X | U-Reach Data Solutions Inc.
Amazon.com: GELRHONR NGFF M.2 to PCI-E 4X 1X Riser Card,M.2 Key M 2260 2280 SSD Port to PCIE Adapter with LED Indicator SATA 15pin Power Riser for Bitcoin Miner Mining-Black : Electronics
Riser PCIe 4x Extension Cable M2 M.2 NVMe SSD to PCIe x4 adapter cards Riser CARD support PCI-E 3.0 x4 Full Speed R24SF 10CM - Newegg.com