4-Port PCIe X4 SATA Card: PCI-Express X4 extends 4 x SATA III 6Gbps ports, then PC can access 4 x SATA drivers simultaniously. You can set up a storage pool, or configure Software RAID in Windows/Mac OS/Linux. (Noted: Can not support Hardware RAID) Based on the ASM1164 chip, Upstream is PCI-Express 3.0 X2 Speed: 4 x SATA III 6Gbps ports share PCI-Express 3.0 X2 bandwidth (2GB/s) Only Port 1 Supprt OS Boot, and the other 3 ports can not support OS Boot 4 x LED Indicators: Red color is working status, and Red flashing is data reading/writing OS Compatibility: Plug-and-play in Windows/Mac OS/Linux/NAS. (Note: can not support Windows XP) For Windows 7, please reinstall the driver according to the manual, download link: https://drive.google.com/drive/folders/16G_sGjexuniyPuJmluL2YRWH-z-NZOli?usp=sharing Accessories: 4 x SATA III cable; 1 x 1:5 SATA Splitter Power Cable; 12cm Regular Profile Bracket and 8cm Low Profile Bracket