2 Port NGFF M.2 B + M Key SSD to PCI-E PCI Express 4X 4 Lane Adapter Converter Card Connects one B key & one M key NGFF SSD at the same time to PCI-E 4X motherboard. Compliant with PCI Express M.2 specification 1.0. Compliant with SATA 3.0 specification for B key. Compliant with PCI-E 4X 3.0 specification for M key. Supports data transfer up to 6.0Gb/s.