4-port expansion design: Single PCIe x16 slot splits into 4 independent SFF-8643 x4 channels, works with SFF-8639 U. 2 NVMe enterprise SSDs; PCIe 4.0 Gen4 compliant, backward compatible with PCIe 3.0, up to 16GT/s per lane for lossless high-speed NVMe transmission; Separate LED status lights for each port, real-time power & data activity monitoring to quickly locate faulty drives; Dual interchangeable brackets (full-height & low-profile), fits standard PC, 2U rack server and compact small-form-factor chassis; Passive splitter board without extra driver, supports hot-swap, S. M. A. R. T and TRIM, compatible with Windows, Linux, Windows Server