The L5-25091-05 is a 4-port 6 Gbps SAS RAID card, manufactured by LSI Logic. This card allows users to connect up to four SAS/SATA hard drives or storage devices with a 6 Gbps data link, allowing for redundancy, better performance, and data protection. The card features a PCI Express 2.0 x8 interface, RAID levels 0, 1, 10, 5, and 50, plus the option for hot-swap installation. In addition, the card is powered by an LSI SAS 2308 controller and supports up to 192 GB of cache memory.