5 Port M.2 SATA 3 PCI-E (B-KEY) Gen3X2 SSD to PCI-E X16 Adapter Expansion Card (SSD not included) PCIE3.0 X2 16Gbps Bandwidth - Newegg.com
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IOCREST SATA III 8 Ports Controller Card PCIe 2.0 x2 Sata 6g Expansion Card with Low Profile Bracket Support win10|pcie 2.0|iocrest satasata iii - AliExpress
ASRock Offers Ultra M.2 PCIe Gen3 x4 Bandwidth on their M.2 Slots