Cisco UCS-HDD300GI2F208= Datasheet download pdf (Page 49)

Cisco UCS C240 M3 High-Density Rack Server (Large Form Factor Hard Disk Drive Model)

SUPPLEMENTAL MATERIAL

Memory Population Rules

When considering the memory configuration of your server, you should take into account the following:

■ The server supports 1, 2, or 3 DIMMs per channel for single- or dual-rank DIMMs.

■ The server supports 1, 2, or 3 DIMMs per channel for quad-rank DIMMs.

■ For optimum performance, populate at least one DIMM per memory channel per CPU.

■ The server supports registered DIMMs (RDIMMs) or load-reduced DIMMS (LRDIMMs), however,

do not mix RDIMMs and LRDIMMs in a server.

■ UDIMMs and non-ECC DIMMs are not supported.

■ 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 bank 1 blue slots in the channels first: A1, E1, B1, F1, C1, G1, D1, H1

— Fill bank 2 black slots in the channels second: A2, E2, B2, F2, C2, G2, D2, H2

— Fill bank 3 black 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 25

Table 25 DIMM Rules for C240 M3 Servers

DIMM Parameter Mix Across a Single Bank? Mix Across Multiple Bank?

DIMM Size

RDIMM = 4, 8, or 16 GB

LRDIMM = 32 GB

No—Must be same size in

the same bank.

You cannot mix 32 GB

LRDIMMs with any RDIMM

Yes—Different banks can use

different DIMM sizes (as long

as all DIMMs in a single bank

use the same DIMM size).

You cannot mix 32 GB

LRDIMMs with any RDIMM

DIMM Speed

1333 or 1600 MHz

Notes . . .

1. Only 1333- and 1600-MHz DIMMs are currently available for the C240 M3 server.

No—Must be same speed in

the same bank.

Yes—but if DIMMs of mixed

speed are used, the server

will clock down to the lowest

speed.

DIMM Type

RDIMMs or LRDIMMs You cannot mix LRDIMMs

with RDIMMS

You cannot mix LRDIMMs with

RDIMMS

32 GB DIMM Population

1 DPC or 2 DPC 3 DPC

DIMMs will run at 1333 MHz

at either 1.35 or 1.5 V

DIMMs will run at 1066 MHz at

either 1.35 V or 1.5 V

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Cisco UCS-HDD300GI2F208= Datasheet Page 49

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