Fujitsu PRIMERGY CX2550 M4

184 Upgrade and Maintenance Manual CX2550/60/70 M4
Main memory
7.1 Basic information
– Each CPU offers 8 slots for DDR4 memory modules.
– Supported memory modules:
RDIMM with ECC, LRDIMM, 3DS-LRDIMM and AEP (Apache Pass) DIMM
– Mixing of LRDIMM with RDIMM is not allowed.
– Unbuffered DIMMs are not supported.
– x4 and x8 DIMMs mixing is not allowed.
– Mixing of non-3DS and 3DS LRDIMMs is not allowed in the same channel,
across different channels, and across different CPU sockets.
– Mixing of AEP DIMMs with RDIMMs is supported.
– Mixing of AEP DIMMs with LRDIMMs is supported.
– If DIMMs with different frequencies are mixed in the same channel, all
DIMMs will run at the common lowest frequency.
– Mixing of DDR4 or AEP operating frequencies is not validated within a
socket or across sockets by Intel CPU.
– There should be at least one DDR4 DIMM per CPU socket (slot 1A/1G).
– If only one DIMM is populated in a channel, then populate it in the slot
furthest away from CPU.
– When single, dual and quad rank DIMMs are populated for 2DPC, always
populate the higher number rank DIMM first (starting from the farthest slot),
for example, first quad rank, then dual rank, and last single rank DIMM.
Figure 81: Mixing of DIMM types within a channel
DIMM types RDIMM 3DS RDIMM LRDIMM 3DS LRDIMM AEP
RDIMM
allowed not allowed not allowed not allowed allowed
3DS RDIMMs
not allowed allowed not allowed not allowed allowed
LRDIMM
not allowed not allowed allowed not allowed allowed
3DS LRDIMM
not allowed not allowed not allowed allowed allowed
AEP
allowed allowed allowed allowed not allowed