Basic Information; Memory Sequence - Fujitsu PRIMERGY CX2550 M1 Upgrade And Maintenance Manual

Main memory
7.1

Basic information

– Each CPU offers 8 Slots for DDR4 memory modules organized in 2 banks
and 4 channels.
– Supported memory modules:
There are 2 different kinds of DDR4 Memory Modules available: RDIMM and
LRDIMM.
– RDIMM / LRDIMM offer different functionality. Mix of RDIMM / LRDIMM is
not allowed.
– Depending on the amount of memory configured you can decide between 2
basic modes of operation:
– Max. DDR4 memory speed depends on the memory configuration on one
memory channel and the speed of the CPU.
– The memory channel with the lowest speed defines the speed of all CPU
channels in the system.
– "If memory modules with different capacities are used: Populate modules
with higher capacities first.
– "If memory modules with different speeds are used: Populate modules with
higher speed first.
– Populate same amounts of memory equally for both CPUs.
7.1.1

Memory sequence

– Populate memory slot 1 / channel A (DIMM-A1) first.
– Within the 4 channels, memory slot 1 must be populated prior to slot 2.
– If memory modules with different capacities are used:
– Install modules with higher capacities first.
– Within a channel, install modules in descending order of capacity.
– If memory modules with different speeds are used, the lowest clock rate
applies for all DIMMs.
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Upgrade and Maintenance Manual
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CX2550 M1