IBM System x3400 Type 7975 User Manual

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Installing a memory module

The following notes describe the types of dual inline memory modules (DIMMs) that

the server supports and other information that you must consider when installing

DIMMs:

v The server supports industry-standard, 1.8 V, 240-pin, 667 MHz, PC2-5300

double-data-rate 2 (DDR2), dynamic random-access memory (DRAM) with error

correcting code (ECC) fully buffered dual inline memory modules (DIMMs). These

DIMMs must be compatible with the latest DDR2 667 MHz DRAM fully buffered

DIMM specification. For a list of supported options for the server, see

http://www.ibm.com/servers/eserver/serverproven/compat/us/; then, select your

country and navigate to the list of options for the server.

v The DIMM options that are supported for the server are 512 MB, 1 GB , and 2

GB in x4 or x8 technology, single-rank or double-rank. The server supports a

minimum of 1 GB and a maximum of 32 GB (reduced to 16 GB in mirrored

mode) of system memory. The server comes with two 512 MB DIMMs installed.

v The system board provides eight functional DIMM connectors and supports

two-way memory interleaving when DIMMs are installed in pairs.

Note: DIMM connectors 3, 6, 9, and 12 are not functional. Do not install DIMMs

in these four connectors and do not remove the DIMM thermal baffles

installed in these connectors unless you need to replace the system

board.

v The memory controller has four fully buffered DIMM channels that are organized

into two branches. Each branch has two channels and each channel controls two

DIMMs. DIMMs that are next to each other (for example, DIMM connector 1 and

DIMM connector 4) within the channels of a branch must be identical in size,

type, speed, and technology. However, the DIMMs in the connector above or

below each other within the channels of a branch do not have to be identical (for

example, the DIMMs in DIMM connector 1 and DIMM connector 2 do not have to

be identical). The following illustration shows how the memory controller is

organized into branches and channels with a pair of DIMMs installed in each

branch.

DIMM 2

DIMM 3

DIMM 1

DIMM 5

DIMM 6

DIMM 4

DIMM 8

DIMM 9

DIMM 7

DIMM 11

DIMM 12

DIMM 10

Memory Controller

Branch 0

Branch 1

Channel 0 Channel 1 Channel 2 Channel 3

v The server can operate in two major modes: mirroring and non-mirroring

(normal). The server can also operate in a single-channel mode when one DIMM

is installed.

v The server supports memory mirroring (mirroring mode) and online-spare

memory.

– Memory mirroring replicates and stores data on DIMMs within two branches

simultaneously. You must enable memory mirroring through the

Configuration/Setup Utility program. To enable memory mirroring in the

Configuration/Setup Utility program, select Devices and I/O Ports →

Advanced Chipset Control → Memory Branch Mode. Use the arrow keys to

change the Memory Branch Mode setting to Mirror; then, save your changes.

16 System x3400 Types 7973, 7974, 7975, and 7976: Installation Guide

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IBM System x3400 Type 7975 Specifications

General

Processor Sockets	2
Memory Slots	8 DIMM slots
Chipset	Intel 5000P
Network	Dual Gigabit Ethernet
Operating System Support	Microsoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server
Processor	Intel Xeon 5000/5100/5300 series, Intel Core 2 Duo
Memory	Up to 32 GB DDR2 ECC
Form Factor	Tower
RAID Support	RAID 0, 1
Power Supply	835W (optional redundant)
Hard Drive Interface	SATA/SAS