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 2400 MT/s, 2133 MT/s, or 1866 MT/s depending on:
• 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
The system contains 24 memory sockets split into two 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 and DIMMs in sockets B1 to B12 are
assigned to processor 2.
The following table shows the memory populations and operating frequencies for the supported
configurations.
Table 21. Memory population — operating frequency for supported configuration
DIMM Type DIMMs
Populated Per
Channel
Voltage
Operating Frequency
(in MT/s)
Maximum DIMM Rank
Per Channel
RDIMM
1
1.2 V
2400, 2133, 1866
Single rank or dual rank
2
2400, 2133, 1866
3
1866
LRDIMM
1
1.2 V
2400, 2133, 1866
Quad rank
2
2400, 2133, 1866
3
2133, 1866
65
