The PEXMSATA343 3-Port PCI Express 2.0 SATA Card with Hyper Duo adds an internal m SATA SSD (Solid State Drive) slot plus three internal SATA III ports to your computer through a PCIe x 2 slot, adding multiple 6 Gbps internal connections that enable you to improve the overall speed & storage capacity of your computer by connecting high-performance SSDs & hard drives. Featuring Hyper Duo technology, the SATA card offers SSD auto-tiering which lets you balance the performance advantages of SSD storage with the cost-effectiveness & large capacity of standard hard drives. By combining SSD & HDD drives into a single volume (up to 3 SSD + 1 HDD), Hyper Duo discreetly works in the background to identify & move frequently accessed files to the faster SSD drive (s) for enhanced data throughput – up to 80% of SSD performance! (Note: The Hyper Duo automatic storage tiering feature is compatible with Windows XP, Vista, 7 & 8 only) The PCIe SATA controller card offers Port Multiplier (PM) support, so multiple SATA drives can be connected over a single cable, for a total of 7 drives (Up to 4 drives through PM on one port, & a single drive to the remaining 2 ports & m SATA slot). Plus, the SATA controller card offers an effective hardware RAID solution, with native RAID (0, 1, 1+0) support.