System memory

Your system supports DDR4 registered DIMMs (RDIMMs), and load reduced DIMMs (LRDIMMs).

NOTE: MT/s indicates DIMM speed in MegaTransfers per second.

Memory bus operating frequency can be 1333 MT/s, 1600 MT/s, 1866 MT/s, or 2133 MT/s depending on the following factors:

  • DIMM type (RDIMM or LRDIMM)
  • 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.
Figure. Memory socket locations
figure helps in locating memory sockets.

Memory channels are organized as follows:

Processor 1
channel 0: slots A1, A5, and A9
channel 1: slots A2, A6, and A10
channel 2: slots A3, A7, and A11
channel 3: slots A4, A8, and A12
Processor 2
channel 0: slots B1, B5, and B9
channel 1: slots B2, B6, and B10
channel 2: slots B3, B7, and B11
channel 3: slots B4, B8, and B12

The following table shows the memory populations and operating frequencies for the supported configurations.

DIMM Type DIMMs Populated/Channel Operating Frequency (in MT/s) Maximum DIMM Rank/Channel
1.2 V
RDIMM 1 2133, 1866, 1600, 1333 Dual rank or single rank
2 2133, 1866, 1600, 1333 Dual rank or single rank
3 1866, 1600, 1333 Dual rank or single rank
LRDIMM 1 2133, 1866, 1600, 1333 Quad rank
2 2133, 1866, 1600, 1333 Quad rank
3 1866, 1600, 1333 Quad rank