HPE 64GB 4Rx4 PC4-2400T-L memory kit, 805358-B21-RFB, is a server memory module for adding memory capacity to a supported system. HPE identifies the base option as a Load Reduced DIMM (LRDIMM), with one 64GB module.
The module uses DDR4 memory rated at 2400 MHz and supports ECC error checking. Its quad-rank 4Rx4 layout and x4 memory width are confirmed in HPE specifications. The listed operating voltage is 1.2 V; HPE gives a native speed of 2400 MT/s and CAS latency 17-17-17.
This is the RFB catalogue variant of HPE option 805358-B21. The sourced product listing identifies the code and memory details; HPE documentation establishes the base option’s LRDIMM configuration.