Quad U.2 SSD to PCIe 4.0/3.0 x16 Expansion Card Motherboard must support 'PCIEX16 Bifurcation' PCI-e 4.0/3.0 x16 4-Drive U.2 SSD add on card PCIe x16 to SFF-8643 for SFF-8639 U.2 Solid State Drive Add 4x U.2 simultaneously via PCI-e 4.0/3.0 x16 slot on the MOBO which is required PCIe x16 Bifurcation supporting 32Gbps max. full speed signal supports Equipped SFF-8643 MiniSAS port, but is not compatible with MiniSAS arrays, only U.2 NVMe SSDs