Cisco UCS C240 M3 High-Density Rack Server (Small Form Factor Disk Drive Model)
14
CONFIGURING the SERVER
Select DIMMs and Memory Mirroring
Select the memory configuration and whether or not you want the memory mirroring option. 
The available memory DIMMs and mirroring option are listed in 
Table 4.
Approved Configurations
(1) 1-CPU configuration without memory mirroring:
■ Select from 1 to 12 DIMMs. Refer to Memory Population Rules, page 50, for more detailed 
information.
(2) 1-CPU configuration with memory mirroring:
NOTE:  When memory mirroring is enabled, the memory subsystem simultaneously 
writes identical data to two channels. If a memory read from one of the channels 
returns incorrect data due to an uncorrectable memory error, the system 
automatically retrieves the data from the other channel. A transient or soft error in 
one channel does not affect the mirrored data, and operation continues unless there 
is a simultaneous error in exactly the same location on a DIMM and its mirrored 
DIMM. Memory mirroring reduces the amount of memory available to the operating 
system by 50% because only one of the two populated channels provides data.
Table 4   Available DDR3 DIMMs  
Product ID (PID) PID Description Voltage
Ranks/
DIMM
DIMM Options
UCS-MR-1X162RY-A 16GB DDR3-1600-MHz RDIMM/PC3-12800/dual rank/x4/1.35v 1.35 V 2
UCS-MR-1X162RX-A 16GB DDR3-1333-MHz RDIMM/PC3-10600/dual rank/x4/1.35v 1.35 V 2
UCS-MR-1X082RY-A 8GB DDR3-1600-MHz RDIMM/PC3-12800/dual rank/x4/1.35v 1.35 V 2
UCS-MR-1X082RX-A 8GB DDR3-1333-MHz RDIMM/PC3-10600/dual rank/x4/1.35v 1.35 V 2
UCS-MR-1X041RY-A 4GB DDR3-1600-MHz RDIMM/PC3-12800/single rank/x4/1.35v 1.35 V 1
UCS-MR-1X041RX-A 4GB DDR3-1333-MHz RDIMM/PC3-10600/single rank/x4/1.35v 1.35 V 1
Memory Mirroring Option
N01-MMIRROR Memory mirroring option