HP 372953-B21 is a 64-bit, 66MHz PCI SATA RAID controller card designed for HP ProLiant servers and compatible systems. The card provides six internal SATA ports with aggregate throughput of up to 9 Gb/s (1.5 Gb/s per port) and supports RAID levels 0, 1, 5, and 10 for data protection and performance optimization. This controller is typically deployed in entry-level to mid-range server environments requiring storage expansion or redundancy without SAS protocol requirements. Compatible with ProLiant DL and ML series servers from the early-to-mid 2000s generation. Tested and guaranteed—available via quote.