The PEXMSATA3422 PCI Express SATA Card helps you improve the overall speed & storage capacity of your computer by giving you multiple 6 Gbps SATA connections for connecting high-performance SSDs (Solid State Drives) & hard drives in a Hyper Duo RAID array. Now, you can easily add two m SATA slots & two SATA III ports to your computer through a single PCIe x 4 slot. 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 8, 7, Vista, & XP only) This versatile RAID controller card helps to relieve the internal space constraints often associated with multi-drive configurations by letting you install two m SATA SSDs directly to the card via convenient, latching slots. With dual m SATA slots, as well as two internal SATA ports, the card offers an effective hardware RAID solution, with native RAID (0, 1) support. The PCIe SATA controller also offers Port Multiplier (PM) support, so you can connect multiple SATA drives to just one port, for a total of 7 drives (up to 4 drives through PM on one port, plus a single drive to the other SATA port & two m SATA slots.)