HP N20162-001 is a 64 GB memory module for expanding supported workstation memory. It uses DDR5-4800 ECC and a registered DIMM design, giving the system additional memory capacity for demanding professional workloads.
The module is listed by HP for the Z4 Rack G5 Workstation. Its format is a 288-pin registered PC5-4800 DIMM. HP specifies ECC memory support for that workstation, while the operating memory speed depends on the slowest installed DIMM or processor.
This is the 64 GB DDR5-4800 option; HP lists other capacities and DDR5-5600 memory under different part numbers.