Memory Population Rules; Low-Voltage Dimm Considerations - Cisco UCS C200 M2 Spec Sheet

SUPPLEMENTAL MATERIAL

Memory Population Rules

When considering the memory configuration of your server, you should consider the following items:
DIMMs within the server should all be the same type and speed. If you mix different DIMM
■
types or DIMMs with different clock rates in the same server, such configurations are
supported; however, these configurations may cause the system to operate at less than
optimum levels. See
DIMMs can be used either in a one DIMM per Channel (1DPC) configuration or in a two DIMMs
■
per Channel (2DPC) configuration.
There are blue and black DIMM slots. Populate blue slots in a bank first.
■
Low-voltage (1.35 V) DIMM and standard-voltage DIMM (1.5 V) can be mixed in the same
■
server. Note that this causes the system BIOS to default to standard-voltage operation
(Performance Mode). See

Low-Voltage DIMM Considerations

The C200 M2 server can be ordered with low-voltage (1.35 V) DIMMs or standard-voltage (1.5 V) DIMMs. Note
the following considerations:
Low-voltage DIMMs within the server must have the identical manufacturer, type, speed,
■
and size.
Low-voltage DIMMs and standard-voltage DIMMs can be mixed in the same server. Note that
■
this causes the system BIOS to default to standard-voltage operation (Performance Mode).
That is, the server cannot operate in Power Saving Mode unless all DIMMs are low-voltage
DIMMs.
CPUs that have a maximum memory frequency less than 1333 MHz support low-voltage
■
DIMMs operating in Power Saving Mode only, and do not support Performance Mode.
46
Table 24 on page 47 for recommended DIMM combinations.
Low-Voltage DIMM
Cisco UCS C200 M2 High-Density SFF Drive Rack-Mount Server
Considerations.