Cisco UCS C22 M3

Cisco UCS C22 M3 High-Density SFF Rack-Mount Server
16
CONFIGURING the SERVER
Caveats
■ Do not mix 1333 MHz and 1600 MHz DIMMs
■ Do not mix DIMM types (RDIMM, LRDIMM, or UDIMM)
■ Do not select more than two different types of DIMMs (only two PID types allowed)
■ For 2-CPU configurations, 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.
■ By default, all DIMMs run at 1.35 V, which yields 1333-MHz memory speeds. To run the
memory DIMMS at 1600 MHz, you need to go into the BIOS or set the policy with UCSM
(service profile) to run in Performance Mode. This forces the DIMMs to operate at 1.5 V and
yields 1600-MHz speeds, provided:
— The DIMMs are 1600-MHz devices
— The CPUs chosen support 1600-MHz operation.
For more information regarding memory, see CPUs and DIMMs, page 49.
NOTE: 32 GB LRDIMMs run at a maximum speed of 1333 MHz for 1 DPC and 2 DPC
even though their specified maximum speed is 1600 MHz.
NOTE: In this server, 4 GB UDIMMs run slower than their specified maximum speed of
1600 MHz. In addition, the following rules apply to UDIMMs:
■ 1 DPC: 1333 MHz is supported at 1.35 V and 1.5 V
■ 2 DPC: 1066 MHz is supported at 1.35 V and 1.5 V