General Memory Module Installation Guidelines - Dell XC720xd Owner's Manual

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.
Table 25. Sample memory configurations
System Capacity (GB) DIMM Size
64
16
128
16
256
16
384
16
512
32
768
32

General memory module installation guidelines

This system supports Flexible Memory Configuration, you can configure and run the system in any valid
chipset architectural configuration. The following are the recommended guidelines for best performance:
• RDIMMs and LRDIMMs must not be mixed.
• You can use x4 and x8 DRMS-based DIMMs. For more information, see Mode-Specific Guidelines in
this document.
Number of DIMMs
2
4
8
12
16
24
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DIMM Slot Population
A1
B1
A1, A2
B1, B2
A1, A2, A3, A4
B1, B2, B3, B4
A1, A2, A3, A4, A5, A6
B1, B2, B3, B4, B5, B6
A1, A2, A3, A4, A5, A6,
A7, A8
B1, B2, B3, B4, B5, B6,
B7, B8
A1, A2, A3, A4, A5, A6,
A7, A8, A9, A10, A11, A12
B1, B2, B3, B4, B5, B6,
B7, B8, B9, B10, B11, B12
41