The UGT-MST644R design encompasses great design and server technology into simple RAID Host controller. It uses the latest storage technology to bring Solid State Memory (mSATA) to cache data in the HDD drive to gain unparalleled access speed. This RAID Host controller enables the use of the industry’s newest and fastest hard drives at 6Gb/s while providing backward compatibility to legacy SATA 3Gb/s. It uses the same cable and connectors as previous SATA generations to ease integration. Come standard for PCI Express 2.0 to double the bandwidth of the existing PCI Express bus for faster data throughput thus enhancing system performance for every type of computer user. Each PCI-Express 2.0 lane provides up to 500MB/s of throughput. It is also backward compatible with previous generation of PCI Express 1.0 technology. Using the onboard RAID firmware, the 2 mSATA port and 2 SATA port attached to this controller can be easily configured as 4 individual ports with no RAID or with RAID 0, RAID 1, RAID 10, and HyperDuo capabilities.See my other sale for one with a low-profile bracket.