HPE 814790-B21 is a 32 GB server memory module for expanding memory in supported HPE ProLiant Gen9 systems. The listing identifies it as a single-module kit, with a capacity of 32 GB (1x32 GB), and also associates it with reference 774174-001.
This is DDR4 Load Reduced memory, specified as Quad Rank x4 and rated at 2133 MHz in the PC4-2133P-L format. These details identify the module’s memory type and speed class for system configuration. Its listed purpose is use in HPE ProLiant Gen9 servers; compatibility beyond that server family is not specified.