– 3 TB using 3DS RDIMMs (two processors installed and one 128 GB 3DS RDIMM installed in each of the24 DIMM slots) (available later)For a list of supported DIMM options, see:http://www.lenovo.com/serverproven/Before installing a DIMM, ensure that all DIMMs to be installed must be the same type. Your server supportsthe following types of DIMMs:• DDR4 RDIMM with ECC technology• DDR4 LRDIMM with ECC technology• DDR4 3DS RDIMM with ECC technology (available later)Note: It is recommended to install DIMMs with the same rank in each channel.The following illustration helps you to locate the DIMM slots on the system board.Figure 44. DIMM slots on the system boardYour server supports the following memory modes:• “Independent mode” on page 59• “Mirroring mode” on page 61• “Rank sparing mode” on page 62Independent modeIndependent mode provides high performance memory capability. You can populate all channels with nomatching requirements. Individual channels can run at different DIMM timings, but all channels must run atthe same interface frequency.Notes:• All DIMMs to be installed must be the same type.• When you install DIMMs with same rank and different capacity, install the DIMM that has the highestcapacity first.The following table shows the DIMM population sequence for independent mode when only one processor(CPU1) is installed.Notes:• If there are three identical DIMMs to be installed for CPU1, and the three DIMMs have the same Lenovopart number, move the DIMM to be installed in slot 8 to slot 1.Chapter 3. Hardware replacement procedures 59
