Smart Array P440ar - Adaptive RAID On Chip (AROC) daughterboard controller - Two internal x4 mini-SAS ports, 2GB of embedded flashed back write cache (FBWC) memory, 12Gb/sec SAS transfer rates - Does not include a battery, FBWC cannot be ordered separately. The HPE 749796-001 Smart Array P440ar Controller is a Flexible Smart Array, 12 Gb/s SAS RAID controller that provides enterprise-class storage performance, increased internal scalability with SAS Expander Card, and data protection for HPE ProLiant Gen9 rack and tower servers. It features eight internal physical links and delivers increased server uptime by providing advanced storage functionality, including online RAID level migration between any RAID levels with flash backed write cache (FBWC), global online spare, and pre-failure warning. The Gen9 controllers support the HPE Smart Storage Battery that allows multiple Smart Array controllers to be supported, resulting in simple upgrade process