Cisco UCS-ML-1X324RU-A= Specifications download pdf (Page 58)

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

SUPPLEMENTAL MATERIAL

Memory Population Rules

When considering the memory configuration of your server, you should consider the following items:

■ Each channel has three DIMM slots (for example, channel A = slots A1, A2, and A3).

— A channel can operate with one, two, or three DIMMs installed.

— If a channel has only one DIMM, populate slot 1 first (the blue slot).

■ When both CPUs are installed, populate the DIMM slots of each CPU identically.

— Fill blue slots in the channels first: A1, E1, B1, F1, C1, G1, D1, H1

— Fill black slots in the channels second: A2, E2, B2, F2, C2, G2, D2, H2

— Fill white slots in the channels third: A3, E3, B3, F3, C3, G3, D3, H3

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

■ Observe the DIMM mixing rules shown in Table 32

Table 32 DIMM Rules for C220 M4 Servers

DIMM Parameter DIMMs in the Same Channel

DIMM in the Same Slot

Notes . . .

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

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

DIMM Capacity

RDIMM = 8 or 16 GB

LRDIMM = 32 GB

DIMMs in the same channel (for

example, A1, A2, and A3) can have

different capacities.

You cannot mix 32 or 64 GB

LRDIMMs with any RDIMM

For best performance, DIMMs in the

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

D1) should have the same capacity.

You cannot mix 32 or 64 GB LRDIMMs

with any RDIMM

DIMM Speed

2133-MHz

2. Only 2133-MHz DIMMs are currently available for the C220 M4 server.

DIMMs will run at the lowest speed

of the DIMMs/CPUs installed

DIMMs will run at the lowest speed of

the DIMMs/CPUs installed

DIMM Type

RDIMMs or LRDIMMs You cannot mix DIMM types in a

channel

You cannot mix DIMM types in a slot

DIMMs per Channel (DPC)

1 DPC, 2 DPC, or 3 DPC

See Table 5 on page 17 for

valid LRDIMM and RDIMM 1 DPC, 2 DPC, and 3 DPC memory configurations

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Cisco UCS-ML-1X324RU-A= Specifications Page 58

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