Cisco UCS-ML-1X324RU-A= Specifications download pdf (Page 20)

Cisco UCS Cisco UCS C220 M4 High-Density Rack Server (Large Form Factor Disk Drive Model)

CONFIGURING the SERVER

As a consequence, faster DIMMs will be operated at timings supported by the slowest

DIMM populated.

— When one DIMM is used, it must be populated in DIMM slot 1 (farthest away from the

CPU) of a given channel.

— When single, dual or quad rank DIMMs are populated for 2DPC or 3DPC, always

populate the higher number rank DIMM first (starting from the farthest slot). For a

3DPC example, first populate with quad-rank DIMMs in the DIMM slot 1. Then

dual-rank DIMMs in the DIMM 2 slot. Then single-rank DIMMs in the DIMM 3 slot.

■ DIMMs for CPU 1 and CPU 2 (when populated) must always be configured identically.

■ When using mirroring, DIMMs must be installed in identical pairs across paired DDR4 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 can be different from those

in channels C and D.

■ Memory mirroring reduces the amount of available memory by 50% (quantity of DIMMs must

be even for mirroring).

■ Non-ECC DIMMs are not supported.

■ Pairs of DIMMs (A1/B1, A2/B2, etc) MUST be the exact same (same PID, rev, DIMM loading

order)

■ Cisco memory from previous generation servers (DDR3) is not compatible with this server

For more information regarding memory, see CPUs and DIMMs, page 55.

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Cisco UCS-ML-1X324RU-A= Specifications Page 20