SIIG Controller Card SC-SA0U11-S1 SATA 6Gb/s 2i+2 microSATA SSD Hybrid PCI-Express Brown Box 2 built-in full size mSATA SSD drive sockets for space saving and superior drive performance Built-in the latest breakthrough Hybrid HyperDuo tiering technology An economical way to enable SSD performance at 1/3 the cost Note: HyperDuo automatic storage tiering is only compatible with Windows XP, Vista, 7 and 8. This feature is not fully supported in the Server OSes" Improve system performance to reduce boot up time of system with demanding applications such as graphic editing tools, gaming, media player and more. Allow large data to be stored on the high capacity HDDs for cost saving Fully automated HyperDuo tiering technology, no need to monitor hot/cold data manually. HyperDuo mode supports Safe mode and Capacity mode Hardware RAID (RAID 0, 1, 10) to offload the host CPU for max performance. Works with the latest 6Gb/s SATA HDDs and backwards compatible with 3Gb/s & 1.5Gb/s HDDs. Hardware RAID (RAID 0, 1, 10) to offload the host CPU for max performance