Datasheet

Cisco UCS C460 M4 High-Performance Rack-Mount Server
CONFIGURING the SERVER
19
■ The minimum DIMM configuration is at least one matched DIMM pair installed in a memory
riser on either CPU1 or CPU2. All four CPUs can run from a single DIMM pair.
■ DIMMs are required to be populated in pairs. DIMMs for this server are available as two-DIMM
kits.
■ The DIMMs in any given pair must be identical.
■ Any DIMM installed in a memory riser corresponding to an empty CPU slot becomes
inaccessible.
■ For optimal performance, distribute DIMMs evenly across all installed CPUs and memory
buffers.
■ Do not mix RDIMMs and LRDIMMs.
■ DIMMs within a channel are populated starting with the DIMMs farthest from the memory
buffer in a fill-farthest approach.
■ Matched pairs of risers on paired DDR3 channels must have identical DIMM configurations.
■ If any GPU is installed, the maximum amount of DIMM memory allowed in the server is 1 TB
(for example, 32x32 GB DIMMs or 64x16 GB DIMMs).
■ If a system uses 64 GB DIMMs, the maximum ambient temperature is 32 °C (89.6 °F). In
addition, systems with 64 GB DIMMs cannot implement any GPUs.
For more information about memory, see CPUs and DIMMs on page 57.
Table 9 DIMM Performance (at 1.35 V)
DIMM GB/Rank/Type
Performance Mode (2:1)
1.35 V DIMM
Lockstep Mode (1:1)
1.35 V DIMM
1 DPC 2 DPC 3 DPC 1 DPC 2 DPC 3 DPC
8 GB/2R/RDIMM 1333 MHz 1066 MHz N/A 1333 MHz 1066 MHz N/A
16 GB/2R/RDIMM 1333 MHz 1066 MHz N/A 1333 MHz 1066 MHz N/A
32 GB/4R/LRDIMM 1333 MHz 1333 MHz N/A 1333 MHz 1333 MHz N/A
64 GB/8R/LRDIMM N/A N/A N/A N/A N/A N/A