General Memory Module Installation Guidelines - Dell PowerEdge R750xa Installation And Service Manual

Table 21. Memory channels (continued)
Processor Channel
A
Processor Slots B1
2 and B9
Table 22. Supported memory matrix
DIMM type Rank
RDIMM 1 R
2 R
LRDIMM 4 R
Intel persistent 2R
memory (BPS)

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 speeds of 3200 MT/s, 2933 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
● Maximum supported speed of the DIMMs
NOTE: MT/s indicates DIMM speed in MegaTransfers per second.
NOTE: FRM-NUMA is supported.
The system supports Flexible Memory Configuration, enabling the system to be configured and run in any valid chipset
architectural configuration. The following are the recommended guidelines for installing memory modules:
● All DIMMs must be DDR4.
● x4 and x8 DRAM based memory modules can be mixed.
● If memory modules with different speeds are installed, they operate at the speed of the slowest installed memory module(s).
● Populate memory module sockets only if a processor is installed.
○ For single-processor systems, sockets A1 to A16 are available.
○ For dual-processor systems, sockets A1 to A16 and sockets B1 to B16 are available.
● In Optimizer Mode, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory
performance.
Table 23. Memory population rules
Processor
Single processor
Dual processor (Start with
processor1. Processor 1
Channel Channel C
B
Slots B5 Slots B3
and B13 and B11
Capacity
8 GB
16 GB, 32 GB, 64
GB
128 GB
128 GB, 256 GB,
512 GB
Configuration
Optimizer (Independent
channel) population order
Optimizer (Independent
channel) population order
Channel D Channel E
Slots B7 Slots B2 and
and B15 B10
DIMM rated
voltage and
speed
DDR4 (1.2 V), 3200
MT/s
DDR4 (1.2 V), 3200
MT/s
DDR4 (1.2 V), 3200
MT/s
DDR4 (1.2 V), 3200
MT/s
Memory population
A{1}, A{2}, A{3}, A{4}, A{5},
A{6}, A{7}, A{8}, A{9},
A{10}, A{11}, A{12}, A{13},
A{14}, A{15}, A{16}
A{1}, B{1}, A{2}, B{2}, A{3},
B{3}, A{4}, B{4}, A{5}, B{5},
A{6}, B{6}, A{7}, B{7} A{8},
Installing and removing system components
Channel F Channel G
Slots B6 Slots B4 and
and B14 B12
Operating Speed
1 DIMM per
channel (DPC)
3200 MT/s
3200 MT/s
3200 MT/s
3200 MT/s
Memory population
information
1, 2, 4, 6, 8, 12 or 16 DIMMs
are allowed.
2, 4, 8, 12, 16, 24 and
32 DIMMs per system
supported.
Channel H
Slots B8 and
B16
2 DIMMs per
channel (DPC)
3200 MT/s
3200 MT/s
3200 MT/s
3200 MT/s
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