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Safety instructions
Before working inside your system
Removing the cooling shroud
After working inside your system
System memory
Your system supports DDR4 registered DIMMs (RDIMMs) and load reduced DIMMs (LRDIMMs). It supports
DDR4 voltage specifications.
NOTE: MT/s indicates DIMM speed in MegaTransfers per second.
Memory bus operating frequency can be either 2400 MT/s, 2133 MT/s, and 1866 MT/s depending on the:
• DIMM type (RDIMM or LRDIMM)
• DIMM configuration (number of ranks)
• Maximum frequency of the DIMMs
• Number of DIMMs populated per channel
• System profile selected (for example, Performance Optimized, Custom, or Dense Configuration
Optimized)
• Maximum supported DIMM frequency of the processors
Your system contains 48 memory sockets split into four sets of 12 sockets, one set per processor. Each
12-socket set is organized into four channels. In each channel, the release levers of the first socket are
marked white, the second socket black, and the third socket green.
NOTE: DIMMs in sockets A1 to A12 are assigned to processor 1, B1 to B12 to processor 2, C1 to C12
to processor 3, and D1 to D12 to processor 4.
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