StarTech.com Dual M.2 PCIe 4.0 x8 x16 to Dual NVMe or AHCI SSD (DUAL-M2-PCIE -CARD-B)
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Amazon.com: NVME Adapter with Heat Sink fo M.2 NVME (M-Key) SSD to PCIE 3.0 X16 Expansion Card : Electronics
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Full Speed M.2 NVMe SSD to PCIe Adapter with Heatsink
Amazon.com: M.2 NVMe SSD to PCIE X16 M Key Hard Drive Adapter, for M.2 PCIe SSD Expansion Card, 4 x 32Gbps Full Speed, Desktop PC Installation, Support PCIE Split or PCIE RAID(ph44) :
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PCI-E Signal Split Array Card Adapter M.2 NVMe SSD to PCIE X16 M Key Hard Drive | eBay