Datasheet
Cisco UCS C240 M3 High-Density Rack Server (Small Form Factor Disk Drive Model)
20
CONFIGURING the SERVER
Caveats
■ System speed is dependent on how many DIMMs are populated per channel. See Table 5 for
details.
■ For optimum performance, do not mix DIMMs with different frequencies. If you mix DIMM
frequencies, the system defaults to the lower frequency.
■ Do not mix RDIMMs with LRDIMMs
■ DIMMs for CPU 1 and CPU 2 (when populated) must always be configured identically.
■ Memory mirroring reduces the amount of available memory by 50% (quantity of DIMMs must
be even for mirroring).
■ By default, starting with UCSM 2.0.4, DIMMs run in memory performance mode (1.5v) by
BIOS default, which yields faster memory speeds than when the BIOS is set for the memory
to run in power-savings mode. Memory speed is dependent on factors such as:
— CPU choice
— DIMM choice
Table 5 DIMM Memory Speeds
DIMM
Speed
DPC
1333-MHz Capable CPU 1600-MHz Capable CPU 1866-MHz Capable CPU
LRDIMM
RDIMM
(DR, SR)
LRDIMM
RDIMM
(DR, SR)
LRDIMM
RDIMM
(DR, SR)
Voltages Voltages Voltages Voltages Voltages Voltages
1.3 V 1.5 V 1.3 V 1.5 V 1.3 V 1.5 V 1.3 V 1.5 V 1.3 V 1.5 V 1.3 V 1.5 V
1333
DIMM
1DPC 1333 1333 1333 1333 1333 1333 1333 1333 1333 1333 1333 1333
2DPC 1333 1333 1333 1333 1333 1333 1333 1333 1333 1333 1333 1333
3DPC 1066 1066
NA
1
Notes . . .
1. NA = not applicable
1066 1066 1066
NA
1
1066 1066 1066
NA
1
1066
1600
DIMM
1DPC 1333 1333 1333 1333
1600
2
2. These DIMMs operate at 1333 MHz instead of 1600 MHz when used with any E5-2600 CPUs. They operate at
1600 MHz when used with E5-2600 v2 CPUs that support 1600- and 1866-MHz speeds.
1600
2
1333 1600
1600
2
1600
2
1333 1600
2DPC 1333 1333 1333 1333
1600
2
1600
2
1333 1600
1600
2
1600
2
1333 1600
3DPC 1066 1066
NA
1
1066 1066 1066
NA
1
1333 1066 1066
NA
1
1333
1866
DIMM
3
3. 1866-MHz DIMMs are only offered and supported with E5-2600 v2 CPU-configured servers
1DPC
NA
1
1333
NA
1
1333
NA
1
1600
NA
1
1600
NA
1
1866
NA
1
1866
2DPC
NA
1
1333
NA
1
1333
NA
1
1600
NA
1
1600
NA
1
1866
NA
1
1866
3DPC
NA
1
1066
NA
1
1066
NA
1
1066
NA
1
1333
NA
1
1333
NA
1
1333