Cisco UCS C480 M5 Руководство - Страница 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
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