Lenovo ThinkAgile HX1321 Series User Manual page 78

– 3 TB using 3DS RDIMMs (two processors installed and one 128 GB 3DS RDIMM installed in each of the
24 DIMM slots)
For a list of supported DIMM options, see:
http://static.lenovo.com/us/en/serverproven/index.shtml
Before installing a DIMM, ensure that all DIMMs to be installed must be the same type. Your server supports
the following types of DIMMs:
• DDR4 RDIMM with ECC technology
• DDR4 LRDIMM with ECC technology
• DDR4 3DS RDIMM with ECC technology
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 42. DIMM slots on the system board
Your server supports the following memory modes:
• "Independent mode" on page 74
• "Mirroring mode" on page 76
• "Rank sparing mode" on page 77
Independent mode
Independent mode provides high-performance memory capability. You can populate all channels with no
matching requirements. Individual channels can run at different DIMM timings, but all channels must run at
the 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 highest
capacity 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 Lenovo
part number, move the DIMM to be installed in slot 8 to slot 1.
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User Guide for ThinkAgile HX1321 Node ThinkAgile HX3321 Node