The HPE Smart Array P840ar/2gb Fbwc 12gb 2-port Internal SAS Controller is a powerful storage controller designed for HPE servers. It features two internal SAS ports and a PCI-Express interface with a data transfer rate of 12Gbps. The controller includes a 2GB Flash Back Write Cache, which provides temporary cache for write operations. This cache helps improve system performance and protect against data loss in case of power failure. The HPE Smart Array P840ar/2gb Fbwc SAS Controller is a reliable and efficient storage solution for HPE servers.