Basic Information - Fujitsu PRIMERGY CX2560 M4 Upgrade And Maintenance Manual

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.
DIMM types RDIMM
RDIMM
allowed
3DS RDIMMs
not allowed
LRDIMM not allowed
3DS LRDIMM
not allowed
AEP
allowed
Figure 81: Mixing of DIMM types within a channel
184
3DS RDIMM
not allowed
allowed
not allowed
not allowed
allowed
Upgrade and Maintenance Manual
LRDIMM 3DS LRDIMM
not allowed not allowed
not allowed not allowed
allowed not allowed
not allowed allowed
allowed allowed
AEP
allowed
allowed
allowed
allowed
not allowed
CX2550/60/70 M4