General Memory Population Conditions; Modes Of Operation; Ddr4 Dimm - Fujitsu PRIMERGY TX2550 M5 Upgrade And Maintenance Manual

Main memory
For system relevant information, see the hardware configurator of your
server available online at the following address:
https://www.fujitsu.com/emeia/products/computing/servers
For Japan:
https://www.fujitsu.com/jp/products/computing/servers/primergy/
10.2.2

General memory population conditions

– Non-ECC DIMMs are not supported on this platform.
– x4 and x8 DIMMs cannot be mixed in any channel.
– Mixing of LRDIMM with RDIMM type is not allowed per platform.
– Mixing of non-3DS and 3DS LRDIMMs is not allowed per platform.
– DIMMs with different frequencies can be mixed in the system, but lowest
frequency determines the system memory speed.
– There should be at least one DDR4 DIMM per CPU socket (slot 1A/1G).
10.2.3

Modes of operation

10.2.3.1

DDR4 DIMM

Three different memory RAS modes are supported (Lockstep Channel mode is
not supported):
– Independent Channel mode
– Rank Sparing mode
– Mirrored Channel mode
Below are the system level RAS mode combination limitations:
– Mixing of Independent Channel mode and Lockstep Channel mode is not
allowed.
– Mixing of Non-Mirrored and Mirrored Channel mode is not allowed.
– Mixing of Lockstep mode and Mirrored Channel mode is not allowed.
– Mixing of Rank Sparing mode and Mirrored Channel mode is not allowed.
396 Upgrade and Maintenance Manual TX2550 M5