Datasheet

Cisco UCS C24 M3 High-Density LFF Rack Server
14
CONFIGURING the SERVER
(2) 1-CPU configuration with memory mirroring:
■ Select 2 or 4 DIMMs. The DIMMs will be placed by the factory as shown in the following table:
(3) 2-CPU configuration without memory mirroring:
■ Select from 1 to 6 DIMMs per CPU (2 to 12 DIMMs total). Refer to Memory Population Rules,
page 48, for more detailed information.
(4) 2-CPU configuration with memory mirroring:
■ Select 2 or 4 DIMMs per CPU (4 or 8 DIMMs total). The DIMMs will be placed by the factory as
shown in the following table
:
■ Select the memory mirroring option (N01-MMIRROR) as shown in Table 4 on page 13.
Caveats
■ Do not mix 1333-MHz with 1600-MHz DIMMs
■ Do not mix DIMM types (RDIMM, LRDIMM, or UDIMM)
■ Do not select more than two different sizes of DIMMs (only two PID sizes allowed)
■ For the 2-CPU configuration, install a minimum of 2 DIMMs (one per CPU).
■ If you use different sizes of DIMMs, the quantity of each size of DIMM must be even (2, 4, or
6). For example, 4 UCS-MR-1X082RY-A DIMMs and 6 UCS-MR-1X162RY-A DIMMs. Also, the sum
of all PIDs must adhere to the maximum quantity rule of 12 DIMMs for 2-CPU systems.
Number of
DIMMs
DIMM Placement
(Channel A is not used with memory mirroring)
2 CPU 1: 1 DIMM in Channel B, 1 DIMM in Channel C
4 CPU 1: 2 DIMMs in Channel B, 2 DIMMs in Channel C
Number of
DIMMs per
CPU
DIMM Placement
(Channels A and D are not used with memory mirroring)
2 CPU 1:
1 DIMM in Channel B
1 DIMM in Channel C
CPU 2:
1 DIMM in Channel E
1 DIMM in channel F
4 CPU 1:
2 DIMMs in Channel B
2 DIMMs in Channel C
CPU 2:
2 DIMMs in Channel E
2 DIMMs in Channel F
NOTE: System performance is optimized when the DIMM sizes and quantities are
equal for both CPUs.