This PCIe x4 adapter converts a motherboard PCIe 3.0 / 4.0 slot into an external OCuLink SFF-8612 port, enabling high-speed connection to NVMe SSDs, U. 2 drives, or eGPU docks via SFF-8611 cables. Delivers up to 64Gbps bandwidth with PCIe 4.0, or 32Gbps with PCIe 3.0. Plug-and-play design requires no drivers, supporting Windows 10/11, Linux, and UEFI 2.3. 1+ boot. Comes with both standard and low-profile brackets for easy installation in various chassis. Ideal for external storage expansion and graphics upgrade.