Massive Storage Expansion: The 4 - port PCIe X1 SATA III Expansion Card allows your PC to access 4 SATA drives together, perfect for creating a large storage pool or setting up software - RAID in Windows, Mac OS, and Linux (no hardware RAID support). Swift Data Transfer: Powered by ASM1064, it has a PCI - Express 3.0 X1 upstream speed of 8GT/s. Each of the 4 downstream SATA ports can reach 207.5MB/s max bandwidth, ensuring fast and stable data transfer for your storage needs. Support OS boot from port 1. Clear Status Indication: Featuring 4 built - in LEDs, drive monitoring is easy. A steady red light means normal operation, while a flashing one signals data read or write, keeping you updated. Wide Compatibility: Designed for simple use, this card is plug - and - play with Windows (except XP), Mac OS, Linux, and NAS systems. No need to worry about driver installs or compatibility. Easy Installation & Full Kit: It fits PCI - Express X1/X4/X8/X16 slots for simple setup. The package comes with 4 SATA III cables, a 1:5 SATA power splitter cable, and 12 - cm regular & 8 - cm low - profile brackets, suitable for any PC case.