General Memory Module Installation Guidelines - Dell VxRail E660 Installation And Service Manual

The following table describes the supported memory matrix:
DIMM type Rank type
RDIMM 2 R
LRDIMM 4 R
8 R
Intel Persistent 2 R
Memory 200 series
(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 operates at a speed of 3200 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.
MT/s indicates DIMM speed in MegaTransfers per second.
The memory bus supports Fault Resilient Memory-Non Uniform Memory Access.
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.
● The following table describes the memory population rules:
Processor
Single processor
Dual processor (Start with
processor1. Processor 1
and processor 2 population
should match)
Capacity
16 GB, 32 GB, 64
GB
128 GB
256 GB
128 GB, 256 GB,
512 GB
Configuration
Optimizer (Independent
channel) population order
Optimizer (Independent
channel) population order
DIMM rated Operating Speed
voltage and
1 DIMM per
speed
channel (DPC)
DDR4 (1.2 V), 3200 3200 MT/s
MT/s
DDR4 (1.2 V), 3200 3200 MT/s
MT/s
DDR4 (1.2 V), 3200 3200 MT/s
MT/s
DDR4 (1.2 V), 3200 3200 MT/s
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}
Replacement of hardware components
2 DIMMs 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 are supported per
system.
NOTE: Optimizer
population order is not
traditional for 8 and 16
DIMMs installations for
dual processor.
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