IBM x3400 User Guide - Page 42

Installing, memory, module

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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 available 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 (16 GB in mirrored mode) of system memory. The server comes with two 512 MB DIMMs installed. v The system board provides 8 functional DIMM connectors and supports two-way memory interleaving when DIMMs are installed in pairs. However, 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 slot 1 and DIMM slot 4) within the channels of a branch must be identical in size, type, speed, and technology. However, the DIMMs in the slots above or below each other within the channels of a branch do not have to be identical (for example, the DIMMs in DIMM slot 1 and DIMM slot 2 do not have to be identical). The following illustration shows how the memory controller is organized into branches and channels with two pairs of DIMMs installed. DIMM 3 DIMM 2 DIMM 1 DIMM 6 DIMM 9 DIMM 5 DIMM 8 DIMM 4 DIMM 7 DIMM 12 DIMM 11 DIMM 10 Channel 0 Channel 1 Branch 0 Channel 2 Channel 3 Branch 1 Memory Controller 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 (see "Using the Configuration/Setup Utility program" on page 76). 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. When you use memory mirroring, consider the following information: 28 System x3400 Types 7973, 7974, 7975, and 7976: User's Guide

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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
then,
select
your
country
and
navigate
to
the
list
of
options
for
the
server.
v
The
DIMM
options
that
are
available
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
(16
GB
in
mirrored
mode)
of
system
memory.
The
server
comes
with
two
512
MB
DIMMs
installed.
v
The
system
board
provides
8
functional
DIMM
connectors
and
supports
two-way
memory
interleaving
when
DIMMs
are
installed
in
pairs.
However,
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
slot
1
and
DIMM
slot
4)
within
the
channels
of
a
branch
must
be
identical
in
size,
type,
speed,
and
technology.
However,
the
DIMMs
in
the
slots
above
or
below
each
other
within
the
channels
of
a
branch
do
not
have
to
be
identical
(for
example,
the
DIMMs
in
DIMM
slot
1
and
DIMM
slot
2
do
not
have
to
be
identical).
The
following
illustration
shows
how
the
memory
controller
is
organized
into
branches
and
channels
with
two
pairs
of
DIMMs
installed.
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
(see
“Using
the
Configuration/Setup
Utility
program”
on
page
76).
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.
When
you
use
memory
mirroring,
consider
the
following
information:
28
System
x3400
Types
7973,
7974,
7975,
and
7976:
User’s
Guide