Modes Of Operation; Ddr4 Dimm - Fujitsu PRIMERGY RX4770 M6 Upgrade And Maintenance Manual

Main memory
DIMM Types RDIMM
RDIMM allowed
LRDIMM not allowed
3DS RDIMM not allowed
Optane allowed
PMem
module
Table 3: Mixing of DIMM types within a channel
10.2.3

Modes of operation

10.2.3.1

DDR4 DIMM

– Unbalanced configurations can lead to significantly reduced bandwidth
because the system will fracture the memory space into multiple regions
– If two DIMMs with different capacity are installed in one channel, the one
with higher capacity has to be placed in slot 1 of a channel. E.g. 1A, 1B, ...
– Rank sparing mode is not supported.
Normal mode
– Normal mode requires 1, 4, 6 or 12 memory modules per CPU.
– ADDDC Sparing is available in case system configured by DDR4 xRx4
DIMM only.
– All channels must run at the same interface frequency but individual
channels may run at different DIMM timings (RAS latency, CAS latency, and
so forth).
240
LRDIMM
not allowed
allowed
not allowed
allowed
Upgrade and Maintenance Manual
3DS RDIMM Optane
PMem
module
not allowed allowed
not allowed allowed
allowed allowed
allowed not allowed
RX4770 M6