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Cisco UCS Cisco UCS C220 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, LRDIMMs, or UDIMMs
■ DIMMs for CPU 1 and CPU 2 (when populated) must always be configured identically.
■ The server supports 1 or 2 DIMMs per channel for single- or dual-rank RDIMMs.
■ The server supports 1 or 2 DIMMs per channel for quad-rank LRDIMMs.
■ When using mirroring, DIMMs must be installed in identical pairs across paired DDR3 buses.
That is, mirrored pairs in channels A and B must be identical and pairs in channels C and D
must be identical. However, the DIMMs used in channels A and B and in C and D can be
different.
■ Non-ECC DIMMs are not supported.
■ Memory mirroring reduces the amount of available memory by 50% (quantity of DIMMs must
be even for mirroring).
■ When single- and dual-rank DIMMs are populated for 2DPC, always populate the dual rank
DIMM in the blue DIMM slot, and the single-rank DIMM in the black DIMM slot (only the 4GB
DIMMs are single-rank).
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)
Voltage Voltage Voltage Voltage Voltage Voltage
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
1600
DIMM
1333 1333 1333 1333
1600
1
Notes . . .
1. 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 1333
1333 1333 1333 1333
1600
2
1600
2
1333 1600
1600
2
1600
2
1333 1600 1333
1866
DIMM
2
2. 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