The HPE Smart Array P840 Controller is a full height, PCIe3 x8, 12Gb/s SAS RAID controller that provides enterprise-class storage performance, increased internal scalability, and data protection for HPE ProLiant Gen9 rack and tower servers. It features 16 internal physical links and delivers increased server uptime by providing advanced storage functionality, including online RAID level migration between any RAID levels with FBWC, global online spare, and pre-failure warning. This controller supports 16 drives without need for the SAS Expander Card providing point to point connectivity to SSDs for lower latency. This controller has transportable FBWC allowing the data in the cache to be migrated to a new controller. The Gen9 controllers support the HPE Smart Storage Battery that allows multiple Smart Array controllers to be supported, resulting in simple upgrade process.

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Ports	Internal: 16 SAS/SATA physical links across 2 x8 port
Performance	12Gb/s SAS (1200 MB/s theoretical bandwidth per physical lane) 6Gb/s SATA (600 MB/s theoretical bandwidth per physical lane) PCI Express Gen3 x8 link width 4 GiBytes 72-bit wide DDR3-1866 Flash Back Write Cache provides up to 14.9GB/s maximum cache bandwidth Read ahead caching Write-back caching
Online Management Features	Online array expansion Online capacity expansion Online logical drive extension Online RAID level migration Online stripe size migration Online mirror split, recombine, and rollback Online active drive replacement Online drive firmware upgrade Online and high performance offline Rapid Parity Initialization (RPI) Unlimited global online spares assignment User selectable expand and rebuild priority User selectable RAID level and stripe size User selectable read and write cache sizes Supports Predictive Spare Activation