HRM516-2I PCIe5.0 Retimer NVMe Adapter, Two x8 MCIO Connector, PCIe 5.0 x16 Enabled NVMe Gen5.0 SSD or PCIe 5.0 Device HRM516-2I has 3 optional firmwares: 1. x4x4 x4x4, which can support to connect 4 SSD. 2. x8 x8, which can support to connect 2 GPU 3. x16, which can support to connect 1 GPU Please contact us before purchasing to update the firmware according to your usage method. No requirements, default X4X4X4 firmware And please note that this card requires the motherboard to support the corresponding PCIe bifurcation. The card does not support x8 x4x4 hybrid PCIe bifurcation to connect devices. HRM516-2I is a 2-Port MCIO(x8) NVME hard drive adapter card independently developed by Embedded with a Montage retimer signal enhancement chip, the host bus can reach to PCIe 5.0 x16 total bandwidth. Through two MCIO(x8) connector, it supports up to 4 NVMe U.2 hard drive. HRM516-2I is suitable for graphics workstations, storage servers and other storage system platforms. Each NVME SSD channel has PCIe5.0 x4 (16Gb/s) bandwidth, and the transmission performance is 40 times faster than SATA. It greatly improves the speed of NVMe and can meet the increasing requirements for response time in enterprise-class storage systems, and supports the growing demand for data storage volume of today's enterprise-class applications, reliable and durable performance, making your storage solution more convenient and efficient. HRM516-2I Instructions for use: 1. The operating system must support the NVMe or the UEFI mode can not boot. 2. HRM516-2I requires motherboard with PCIe bifurcation function in BIOS.