Sustain critical server workloads with a RAID controller designed for dense internal storage and fast recovery. The Lenovo RAID 940-8I 4GB FLASH combines PCIe 4.0 x8 host connectivity with 12 Gb/s SAS performance and 4 GB of flash-backed cache to keep write-heavy applications moving when latency matters. Built as a plug-in card for Lenovo servers, this controller supports RAID 0, 1, 10, 5, 50, 6, and 60, giving infrastructure teams the flexibility to balance capacity, performance, and fault tolerance across mixed workload tiers. Eight internal SAS ports provide direct connectivity for server-attached drives, while flash-backed cache helps protect cached data during unexpected power loss. This is the kind of controller chosen when downtime, rebuild time, and storage consistency carry real cost. It fits environments that need dependable RAID management for operating systems, virtualization hosts, and application servers without moving to a more complex external storage stack. For teams standardizing on Lenovo ThinkSystem platforms, it delivers the controller class expected in production hardware.