Cisco UCS C480 M5 Manual - Page 15

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When mixing DIMMs, the following rules must be followed:

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Any DIMM installed in a DIMM socket for which the CPU is absent is not recognized.

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Observe the DIMM mixing rules shown in

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Table 6 DIMM Rules for C480 M5 Servers

DIMM Parameter

DIMM Capacity

RDIMM = 16, 32, 64, 128 GB

LRDIMM = 64 GB, 128 GB

TSV-RDIMM = 64 GB, 128GB

DIMM Speed

2666-MHz or 2933-MHz

DIMM Type

TSV-RDIMMS, RDIMMs, or

LRDIMMs

Notes:

1. Although different DIMM capacities can exist in the same slot, this will result in less than optimal performance.

For optimal performance, all DIMMs in the same slot should be identical.

Cisco UCS C480 M5 Memory Guide

RDIMMs cannot be mixed with LRDIMMs.

RDIMMs of different sizes can be mixed within a channel. When mixing RDIMMs of

different densities (sizes), populate DIMMs with the highest density first. For

example, if you have to mix 32 GB RDIMMs with 16 GB RDIMMs, then populate the 32

GB DIMMs in blue slots (or slot 1) and then 16 GB DIMMs in black slots (or slot 2).

RDIMMs of different ranks can be mixed within a channel. When mixing RDIMMs with

different ranks, populate RDIMMs with the higher rank first. For example, when

mixing dual-rank RDIMMs with single-rank RDIMMs populate the dual-rank RDIMMs in

blue slots first and then single-rank RDIMMs in black slots.

64 GB 2933-MHz LRDIMMs can only be mixed with 128 GB 2933-MHz LRDIMMs.

2666-MHz TSV RDIMMs cannot be mixed with standard RDIMMs. For example, 64 GB

2666-MHz TSV RDIMMs cannot be mixed with 32 GB 2666-MHz RDIMMs.

TSV RDIMMs cannot be mixed with LRDIMMs. For example, 128 GB 2666-MHz TSV

RDIMMs cannot be mixed with 64 GB 2666-MHz LRDIMMs.

64 GB 2666-MHz TSV RDIMMs can only be mixed with 128 GB 2666-MHz TSV RDIMMs.

64 GB 2666-MHz LRDIMMs can only be mixed with 32 GB 2666-MHz LRDIMMs.

DIMMs in the Same Channel

DIMMs in the same channel (for

example, A1 and A2) can have

different capacities.



Do not mix TSV-RDIMMS with

LRDIMMs nor RDIMMs

DIMMs will run at the lowest

speed of the CPU installed

Do not mix DIMM types in a

channel

Table 6

DIMM in the Same Slot

For best performance, DIMMs in the

same slot (for example, A1, B1, C1,

D1, E1, F1) should have the same

capacity.



Do not mix TSV-RDIMMS with

LRDIMMs nor RDIMMs

DIMMs will run at the lowest speed

of the CPU installed

Do not mix DIMM types in a slot

DIMM Population Rules