General Memory Module Installation Guidelines - Dell VxRail VP-760 Manual

DIMM type Rank
RDIMM 1 R
2 R
4 R
NOTE: The processor may reduce the performance of the rated DIMM speed.

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 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.
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 DDR5.
● All DDR5 DIMMs must be in the same speed per Processor socket.
● Mixing of DIMMs is not allowed.
● 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.
The following table describes the memory population information:
Processor
Single processor
Dual processor (Start with processor1.
Processor 1 and processor 2 population
should match)
● Populate all the sockets with white release tabs first, followed by the sockets with black release tabs.
● Supported RDIMM configurations are 1, 2, 4, 6, 8, 12, or 16 DIMMs per processor.
Capacity DIMM rated
voltage and
speed
16 GB DDR5 (1.1 V), 4800
MT/s
32 GB, 64 GB DDR5 (1.1 V), 4800
MT/s
128 GB DDR5 (1.1 V), 4800
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}, B{8}, A{9}, B{9}, A{10},
B{10}, A{11}, B{11}, A{12}, B{12}, A{13},
B{13}, A{14}, B{14}, A{15}, B{15},
A{16}, B{16}
Operating Speed
1 DIMM per
channel (DPC)
4800 MT/s
4800 MT/s
4800 MT/s
Memory population information
1, 2, 4, 6, 8, 12 or 16 DIMMs are
allowed.
2, 4, 8, 12, 16, 24 or 32 DIMMs are
supported per system.
Component replacement guidelines
2 DIMMs per
channel (DPC)
4400 MT/s
4400 MT/s
4400 MT/s
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