53Upgrading the system memorySystem memory interfaceThe server has a total of twenty four DIMM slots. Each CPU controls fourchannels and each channel has three slots. The DIMM slots supportDDR3-1333 registered/unbuffered ECC memory modules.For single rank and dual rank RDIMM, a maximum of three DIMMs perchannel or a total of 24 DIMMs can be supported. For UDIMM and quadrank RDIMM, only a maximum of two DIMMs per channel can besupported.Independent mode• For all memory modes, slot 1 in each channel should be populated firstand then slot 2. If slot 1 is empty, then slots 2 and 3 cannot be used.• For a single-processor server configuration, install the processor inCPU1 socket and the memory modules in slots P1DIMM A1 toP1DIMM D3.• If there is a processor installed in CPU2 socket, the system will enablethe slots P2DIMM E1 to P2DIMM H3.
