General Memory Module Installation Guidelines - Dell EMC PowerEdge R940 Installation And Service Manual

Figure 57. Memory socket location on the processor expansion module
Memory channels are organized as follows:
Table 20. Memory channels
Proce Channel 0
ssor
Proces Slots A1 and A7
sor 1
Proces Slots B1 and B7
sor 2
Proces Slots C1 and C7
sor 3
Proces Slots D1 and D7
sor 4

General memory module installation guidelines

To ensure optimal performance of your system, observe the following general guidelines when configuring your system memory.
If your system's memory configurations fail to observe these guidelines, your system might not boot, stop responding during
memory configuration, or operate with reduced memory.
The memory bus may operate at frequencies 2933 MT/s, 2666 MT/s, 2400 MT/s, or 2133 MT/s depending on the following
factors:
● System profile selected (for example, Performance Optimized, or Custom [can be run at high speed or lower])
● Maximum supported DIMM speed of the processors. For memory frequency of 2933 MT/s, one DIMM per channel is
supported.
● Maximum supported DIMM speed of the processors.
● Maximum supported speed of the DIMMs
NOTE: MT/s indicates DIMM speed in MegaTransfers per second.
Channel 1 Channel 2
Slots A2 and A8 Slots A3 and A9
Slots B2 and B8 Slots B3 and B9
Slots C2 and C8 Slots C3 and C9
Slots D2 and D8 Slots D3 and D9
Channel 3 Channel 4
Slots A4 and A10 Slots A5 and A11
Slots B4 and B10 Slots B5 and B11
Slots C4 and C10 Slots C5 and C11
Slots D4 and D10 Slots D5 and D11
Installing and removing system components
Channel 5
Slots A6 and A12
Slots B6 and B12
Slots C6 and C12
Slots D6 and D12
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