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Dell PowerEdge R920 System Owner's Manual

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System Memory

Your system supports DDR3 ECC registered DIMMs (RDIMMs) and load reduced DIMMs (LRDIMMs) at DDR3 (1.5V) and DDR3L (1.35V) voltage specifications. It also supports single, dual, quad and octal rank DIMMs of upto 1600 MHz.

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

Memory bus operating frequency can be 1066 MT/s, 1333 MT/s, and 1600 MT/s depending on:

  • DIMM type (RDIMM and LRDIMM)
  • DIMM configuration (number of ranks)
  • Maximum frequency of the DIMMs
  • Number of DIMMs populated per channel
  • DIMM operating voltage
  • System profile selected (for example, Performance Optimized, Custom, or Dense Configuration Optimized)
  • Maximum supported DIMM frequency of the processors
The system memory contain 96 memory sockets organized into eight memory risers, split into four sets of two risers per processor. Each memory riser has:
  • 12 DIMM sockets arranged 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.
  • Two Scalable Memory Interconnect-2 (SMI-2) ports that help DIMMs to connect with the processor.
  • Two Scalable Memory Buffers (SMB) that provide access to the DIMMs.
SMI-2 ports operate in two modes:
NOTE:GT/s indicates memory bus speed in Giga transfers per second.
  • Performance Mode (2:1) up to 2.66 GT/s for higher bandwidth.
  • Lock Step Mode (1:1) up to 1.60 GT/s for higher DDR3 speeds and better RAS (Reliability, Availability, and Serviceability) features.

The maximum memory that is supported on your system varies according to the sizes of memory modules being used. Single, dual, quad, and octal-rank DIMMs of sizes 4 GB and 8 GB. The system also supports 16 GB RDIMM and 32 GB/64 GB of LRDIMMs memory for a total of up to 6 TB.

NOTE:DIMMs in memory risers A and B are assigned to processor 1, C and D are assigned to processor 2, E and F are assigned to processor 3 and G and H are assigned to processor 4.
Figure 1. Memory Socket Locations
This figure helps in locating memory sockets on the memory riser.

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
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
Processor 2
channel 0: slots C1, C5, and C9
channel 1: slots C2, C6, and C10
channel 2: slots C3, B7, and C11
channel 3: slots C4, C8, and C12
channel 0: slots D1, D5, and D9
channel 1: slots D2, D6, and D10
channel 2: slots D3, D7, and D11
channel 3: slots D4, D8, and D12
Processor 3
channel 0: slots E1, E5, and E9
channel 1: slots E2, E6, and E10
channel 2: slots E3, E7, and E11
channel 3: slots E4, E8, and E12
channel 0: slots F1, F5, and F9
channel 1: slots F2, F6, and F10
channel 2: slots F3, F7, and F11
channel 3: slots F4, F8, and F12
Processor 4
channel 0: slots G1, G5, and G9
channel 1: slots G2, G6, and G10
channel 2: slots G3, G7, and G11
channel 3: slots G4, G8, and G12
channel 0: slots H1, H5, and H9
channel 1: slots H2, H6, and H10
channel 2: slots H3, H7, and H11
channel 3: slots H4, H8, and H12
Table 1. Memory populations and operating frequencies for supported configurations in R920 (Performance Mode (2:1))The following table shows the memory populations and operating frequencies for the supported configurations (Performance Mode (2:1)).
DIMM Type DIMMs Populated/Channel (DPC) DIMM Size Operating Frequency (in MT/s) Maximum DIMM Rank/Channel
DDR3 (1.5 V) DDR3 (1.35 V)
RDIMM 1 4 GB 1333 and 1066 1333 and 1066 Quad rank
2 8 GB 1333 1066 Dual rank
3 16 GB 1066 Not Applicable Dual rank
LRDIMM 1 32 GB / 64 GB 1333 and 1066 1333 Quad rank physical
2 32 GB / 64 GB 1333 and 1066 1333 Quad rank physical
3 32 GB / 64 GB 1333 and 1066 Not Applicable Quad rank physical
Table 2. Memory populations and operating frequencies for supported configurations in R920 (Lock Step Mode (1:1))The following table shows the memory populations and operating frequencies for the supported configurations (Lock Step Mode (1:1)).
DIMM Type DIMMs Populated/Channel (DPC) DIMM Size Operating Frequency (in MT/s) Maximum DIMM Rank/Channel
DDR3 (1.5 V) DDR3 (1.35 V)
RDIMM 1 4 GB 1600 1333 and 1066 Quad rank
2 8 GB 1333 1066 Dual rank
3 16 GB 1066 Not Applicable Dual rank
LRDIMM 1 32 GB / 64 GB 1600 1333 Quad rank physical
2 32 GB / 64 GB 1600 1333 Quad rank physical
3 32 GB / 64 GB 1333 and 1066 Not Applicable Quad rank physical
Table 3. Maximum operating frequencies for supported configurations in R920 (Lock Step Mode (1:1) and Lock Step Mode (2:1))The following table shows the processor and maximum operating frequencies for the supported configurations (Lock Step Mode (1:1) and Lock Step Mode (2:1)).
Processor Maximum Operating Frequency (in MT/s)
Lock Step Mode (1:1) Lock Step Mode (2:1)
Intel Xeon E7-2800 v2 series E7-2850 v2 1333 1066
E7-2870 v2 1600 1333
E7-2880 v2 1600 1333
E7-2890 v2 1600 1333
Intel Xeon E7-4800 v2 series E7-4809 v2 1066 1066
E7-4820 v2 1333 1066
E7-4830 v2 1333 1066
E7-4850 v2 1333 1066
E7-4860 v2 1600 1333
E7-4870 v2 1600 1333
E7-4880 v2 1600 1333
E7-4890 v2 1600 1333
Intel Xeon E7-8800 v2 series E7-8857 v2 1600 1333
E7-8880L v2 1600 1333
E7-8891 v2 1600 1333
E7-8893 v2 1600 1333

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