The PCI-e Controller Card gives you an easy way to add additional 4 internal SATA III ports to your computer by a single PCI Express slot. The SATA III ports offer a blazing-fast speed of 6Gbps, while remaining backwards compatible with the SATA I and SATA II specifications. Also, it supports Port Multiplier FIS Based or Command Based switching, ensuring maximum performance. Chipset: Marvell 88SE9215 Compliant with PCI-Express Specification v2.0 and backwards compatible with PCIe 1.x Compliant with Serial ATA Specification 3.0 Supports Communication Speeds of 6.0 Gbps, 3.0 Gbps, and 1.5 Gbps Hot Plug and Hot Swap Supports Native Command Queue (NCQ) Supports Port Multiplier FIS Based Switching or Command Based Switching Compatible with SATA 6G, 3G and 1.5G Hard Drives SATA ports are bootable For port multiplier function, please follow Windows 8 instructions in Download's tab. Not a Hardware RAID controller. Supports 3TB and 4TB hard drives.