This 64GB memory is 100% compatible with HP ProLiant BL660c Gen9 (G9).
Our memory team will be happy to assist you in choosing the right memory and configuring your device.The following technical conditions should be taken into account in advance:The memory can be selected as RDIMM (Registered DIMM) or LRDIMM (Load Reduced DIMM) memoryRDIMM and LRDIMM cannot be used together.When upgrading, you should therefore know which memories are already present or upgrade completely with LRDIMM memory.Only the memory slots where the respective CPU is present can be used.