Lenovo ThinkSystem ST550 - Page 75

– TruDDR4 2666, single-rank/dual-rank, 8 GB/16 GB/32 GB registered DIMMs (RDIMMs)
– TruDDR4 2666, quad-rank, 64 GB load-reduced DIMMs (LRDIMMs)
For Intel Xeon SP Gen 2 processors
• Minimum: 8 GB (one processor and one 8GB registered DIMM (RDIMM) installed)
• Maximum: 768 GB (two processors and twelve 64 GB registered DIMMs (RDIMMs) installed)
• Type:
– TruDDR4 2666, single-rank/dual-rank, 16 GB/32 GB registered DIMMs (RDIMMs)
– TruDDR4 2933, single-rank/dual-rank, 8 GB/16 GB/32 GB/64 GB registered DIMMs (RDIMMs)
For a list of supported DIMM options, see:
http://www.lenovo.com/us/en/serverproven/
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 (not supported for Intel Xeon SP Gen 2 processors) with ECC technology
The following illustration helps you to locate the DIMM slots on the system board.
Figure 36. DIMM slots on the system board
The following memory modes are available:
• “Independent mode” on page 71
• “Mirroring mode” on page 73
• “Rank sparing mode” on page 73
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.
Chapter 3. Server hardware setup 71