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Dell PowerEdge M820 Systems Owner's Manual

System Memory

Your system supports DDR3 registered DIMMs (RDIMMs) and load reduced DIMMs (LRDIMMs). It supports DDR3 and DDR3L voltage specifications.

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

Memory bus operating frequency can be either 800 MT/s, 1066 MT/s , 1333 MT/s, or 1600 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
  • DIMM operating voltage
  • System profile selected (for example, Performance Optimized, Custom, or Dense Configuration Optimized)
  • Maximum supported DIMM frequency of the processors

The 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.
Figure 1. Memory Socket Locations The figure shows memory socket locations.

Memory channels are organized as follows:

Processor 1
channel 0: memory sockets A1, A5, and A9
channel 1: memory sockets A2, A6, and A10
channel 2: memory sockets A3, A7, and A11
channel 3: memory sockets A4, A8, and A12
Processor 2
channel 0: memory sockets B1, B5, and B9
channel 1: memory sockets B2, B6, and B10
channel 2: memory sockets B3, B7, and B11
channel 3: memory sockets B4, B8, and B12
Processor 3
channel 0: memory sockets C1, C5, and C9
channel 1: memory sockets C2, C6, and C10
channel 2: memory sockets C3, C7, and C11
channel 3: memory sockets C4, C8, and C12
Processor 4
channel 0: memory sockets D1, D5, and D9
channel 1: memory sockets D2, D6, and D10
channel 2: memory sockets D3, D7, and D11
channel 3: memory sockets D4, D8, and D12

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

Processor TypeDIMM TypeDIMMs Populated/ChannelOperating Frequency (in MT/s)Maximum DIMM Rank/Channel
   1.5 V1.35 V 
Intel Xeon Processor E5–4600RDIMM11600, 1333, 1066, and 8001333, 1066, and 800Dual rank
1333, 1066, and 8001066 and 800Quad rank
21600, 1333, 1066, and 8001333, 1066, and 800Dual rank
1066 and 8001066 and 800Quad rank
31333, 1066, and 8001066 and 800Dual rank
LRDIMM11333 and 10661333 and 1066Quad rank
21333 and 10661333 and 1066Quad rank
31066 1066 Quad rank
Intel Xeon Processor E5–4600 v2 RDIMM11866, 1600, 1333, 1066, and 8001600, 1333, 1066, and 800Dual rank
1333, 1066, and 800 1066 and 800 Quad rank
21866, 1600, 1333, 1066, and 8001600, 1333, 1066, and 800Dual rank
1066 and 8001066 and 800Quad rank
31333, 1066, and 8001066 and 800Dual rank
LRDIMM11866 , 1600, 1333, and 10661600, 1333, and 1066Quad rank
1600,1333, and 1066 Octal rank
21600,1333, and 10661600,1333, and 1066Quad rank
 1333 and 1066 Octal rank
31333 and 10661066Quad rank
 1066 Octal Rank

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