Cisco UCS C480 M5 Guide

Cisco UCS C480 M5 Memory Guide
DIMM Population Rules
15
■ When mixing DIMMs, the following rules must be followed:
— 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
266
6-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.
■ Any DIMM installed in a DIMM socket for which the CPU is absent is not recognized.
■ Observe the DIMM mixing rules shown in Table 6
Table 6 DIMM Rules for C480 M5 Servers
DIMM Parameter DIMMs in the Same Channel
DIMM in the Same Slot
1
DIMM Capacity
RDIMM = 16, 32, 64, 128 GB
LRDIMM = 64 GB, 128 GB
TSV-RDIMM = 64 GB, 128GB
DIMMs in the same channel (for
example,
A1 and A2) can have
different capacities.


Do not mix TSV-RDIMMS with
LR
DIMMs nor RDIMMs
For best performance, DIMMs in the
sam
e slot (for example, A1, B1, C1,
D1, E1, F1) should have the same
capacity.

Do not mix TSV-RDIMMS with
LRDIMMs nor RDIMMs
DIMM Speed
2666-MHz or 2933-MHz
DIMMs will run at the lowest
sp
eed of the CPU installed
DIMMs will run at the lowest speed
of the CPU installed
DIMM Type
TSV-RDIMMS, RDIMMs, or
LRDIMMs
Do not mix DIMM types in a
channel
Do not mix DIMM types in a slot
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 Specifications

General

Brand	Cisco
Model	UCS C480 M5
Category	Server
Language	English