.Motherboards and BIOS MUST support bifurcation otherwise only first drive can be recognized Product Model:P416-2SFF8654-8I Product Name:PCI Express x16 to Two SlimSAS SFF-8654 8i Adapter Interface Type:2*Slim SAS SFF-8654 8i Support Equipment: Up to 4* PCIe 4.0 U.2 NVMe SSD Host Bus Type: PCIe x 16 Ps. Motherboards and BIOS Support Bifurcation required Product Description P416-2SFF8654-8I is a high performance, low dielectric loss factor interface conversion card designed for PCIe 4.0 U.2 SSD. It connects NVMe SSD or PCIe connectors via SlimSAS connector (SFF-8654). The bandwidth of the card is the bandwidth that the PCIe slot of the motherboard can support. The Motherboard with CPU and BIOS needs to support bifurcation to ensure PCIe x16 link width to bifurcate two x8 link width or four x4 link width for NVMe SSD, Otherwise this card can only support PCIe x16 link width. Features Directly connected to PCIe 4.0 U.2 NVMe SSD by SFF-8654 8i to SFF-8639 cable Support bifurcated in quad x4data link width configuration(CPU and BIOS both support) Support bifurcated in two x8 data link width configuration (CPU and BIOS both support) l Build in SlimSAS(SFF-8654) 8i connector 2 sets, pin-out defined by SFF-9402 for high-performance storage connectivity PCIe Standard Full-profile bracket pre-installed and also a low-profile bracket for small form factor computer. Specifications PCI Express Base Specification, r4.0, compatible PCIe 1.0&2.0&3.0 Compliant with SFF-8654 Specification Version 1.2 Compliant with NVM Express 1.3 Support up to 4 NVMe SSDs Operating system support The adapter does not require a driver for operation or communication to attached NVMe drives. The drives are presented natively to the host and use the native NVMe drivers. Redhat Free BSD Vmware Linux Windows Application Suitable for higher performance of PCIe Gen 4 connections for Storage Servers, Data Center, Servers RAIDs and Controllers