General Memory Module Installation Guidelines - Dell PowerEdge R760xa Installation And Service Manual

Table 70. Memory channels
Processor Channel
A
Processor 1 Slots A1
and A9
Processor Slots B1
2 and B9
Table 71. Supported memory matrix
DIMM type Rank
RDIMM 1 R
2 R
4 R
8 R

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 configuration fails 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 4800 MT/s, 4400 MT/s or 4000 MT/s depending on the following factors:
● System profile selected (for example, Performance, Performance Per Watt Optimized (OS), 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: Fault Resilient Memory supports only eight and sixteen DIMMs per processor.
● All DIMMs must be DDR5.
● Memory mixing is not supported for:
○ Different DIMM capacities
○ X4 and X8 DRAM memory modules
○ 3DS and non-3DS RDIMMs
NOTE: 3DS is a DRAM technology used to manufacture the highest capacity DIMMs. Refer to your DIMM
documentation for additional details.
● 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.
○ A minimum of 1 DIMM must be populated for each installed processor.
● In Optimizer Mode, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory
performance.
96 Installing and removing system components
Channel Channel C
B
Slots A7 Slots A3
and A15 and A11
Slots B7 Slots B3
and B15 and B11
Capacity
16 GB
32 GB, 64 GB
128 GB
256 GB
Channel D Channel E
Slots A5 Slots A4 and
and A13 A12
Slots B5 Slots B4 and
and B13 B12
DIMM rated
voltage and
speed
DDR5 (1.1 V), 4800
MT/s
DDR5 (1.1 V), 4800
MT/s
DDR5 (1.1 V), 4800
MT/s
DDR5 (1.1 V), 4800
MT/s
Channel F Channel G
Slots A6 Slots A2 and
and A14 A10
Slots B6 Slots B2 and
and B14 B10
Operating Speed
1 DIMM per
channel (DPC)
4800 MT/s
4800 MT/s
4800 MT/s
4800 MT/s
Channel H
Slots A8 and
A16
Slots B8 and
B16
2 DIMMs per
channel (DPC)
4400 MT/s
4400 MT/s
4400 MT/s
4400 MT/s