The HPE Smart Array P431/4GB FBWC is a 12 Gb/s external SAS RAID controller designed for enterprise storage environments. This PCIe3 x8 low-profile controller features 4 GB of Flash Backed Write Cache with DDR3-1866MHz technology, providing a maximum cache bandwidth of up to 14.9 Gb/s. With two external SAS ports supporting up to 200 drives per controller, it allows for significant storage expansion for demanding workloads. The controller offers comprehensive data protection through RAID 6 ADG, RAID 60 ADG, and RAID 1 ADM configurations, as well as online RAID level migration between any RAID levels. Optional HP Secure Encryption ensures enterprise-class data security for data at rest on connected storage devices. The HP SSD Smart Path technology enhances SSD read performance by up to four times for Microsoft Windows, Linux, and VMware environments. The Flash Backed Write Cache ensures data retention during power outages, while predictive spare drive activation reduces recovery times and maximizes system availability. This controller is compatible with selected HP ProLiant Gen8 rack and tower servers and maintains data compatibility with other HP Smart Array controllers for seamless upgrades. The external connectivity supports enterprise storage expansion requirements, making it suitable for data-intensive applications that require reliable, high-performance storage management.