IBM 84885BU User Manual - Page 44

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 comes with either two 256 MB or two 512 MB memory DIMMs installed in DIMM 1 and DIMM 2 memory connectors. The second pair of DIMMs must be installed in DIMM 3 and DIMM 4 memory connectors and the third pair in DIMM 5 and DIMM 6 memory connectors. v DIMMs must be installed in matched pairs. The DIMMs in each pair must be the same size, speed, type, and technology as each other but do not have to match the other pairs. You can mix compatible DIMMs from various manufacturers. v Install only 1.8 V, 184-pin, double-data-rate 2 (DDR2), PC2-3200, registered, synchronous dynamic random-access memory (SDRAM) with error correcting code (ECC), dual inline memory modules (DIMMs). These DIMMs must be compatible with the latest PC2-3200 SDRAM buffered DIMM specification. For a list of supported options for the server, go to http://www.ibm.com/pc/; then, select your country and navigate to the list of options for the server. v The system board contains six DIMM connectors and supports two-way memory interleaving when the DIMMs are installed in pairs and functioning properly. If one DIMM in the pair fails, the server runs in single-channel mode (non-interleaving). A failed DIMM must be replaced as soon as possible; otherwise, the server will not start (boot). v The DIMM-installation sequence is based on single-rank DIMMs, double-rank DIMMs, and mixing single-rank and double-rank DIMMs. Single-rank DIMMs are 256 MB, 512 MB, and 1 GB memory modules. Double-rank DIMMs are 2 GB memory modules. The following table lists the DIMM-installation sequence for the server maximum memory capacity using mixed single-rank and double-rank DIMMs. Notes: 1. Do not install four 2 GB double-rank DIMMs for the server maximum capacity (8 GB) configuration; the server does not support it. 2. You can install pairs of 256 MB, 512 MB, 1 GB, and 2 GB DIMMs in the server, but for the server maximum capacity you must use the DIMM-sequence in the table below. 3. You can install any combination of DIMM pairs in the server; however, you can install only two 2 GB double-rank DIMMs in the server, and they must go in DIMM connectors 1 and 2. Do not install 2 GB double-rank DIMMs in any connectors other than DIMM connectors 1 and 2. 4. If you order DIMMs from IBM, the variable 2R in the description for the memory indicates that the DIMM is a double-rank 2 GB DIMM. Table 2. Maximum memory capacity (8 GB) and installation sequence mixing single-rank and double-rank DIMMs DIMM pair DIMM connectors DIMM size Rank First pair 1, 2 2 GB Double-rank Second pair 3, 4 1 GB Single-rank Third pair 5, 6 1 GB Single-rank 34 xSeries 226 Type 8488 and 8648: Hardware Maintenance Manual and Troubleshooting 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
comes
with
either
two
256
MB
or
two
512
MB
memory
DIMMs
installed
in
DIMM
1
and
DIMM
2
memory
connectors.
The
second
pair
of
DIMMs
must
be
installed
in
DIMM
3
and
DIMM
4
memory
connectors
and
the
third
pair
in
DIMM
5
and
DIMM
6
memory
connectors.
v
DIMMs
must
be
installed
in
matched
pairs.
The
DIMMs
in
each
pair
must
be
the
same
size,
speed,
type,
and
technology
as
each
other
but
do
not
have
to
match
the
other
pairs.
You
can
mix
compatible
DIMMs
from
various
manufacturers.
v
Install
only
1.8
V,
184-pin,
double-data-rate
2
(DDR2),
PC2-3200,
registered,
synchronous
dynamic
random-access
memory
(SDRAM)
with
error
correcting
code
(ECC),
dual
inline
memory
modules
(DIMMs).
These
DIMMs
must
be
compatible
with
the
latest
PC2-3200
SDRAM
buffered
DIMM
specification.
For
a
list
of
supported
options
for
the
server,
go
to
then,
select
your
country
and
navigate
to
the
list
of
options
for
the
server.
v
The
system
board
contains
six
DIMM
connectors
and
supports
two-way
memory
interleaving
when
the
DIMMs
are
installed
in
pairs
and
functioning
properly.
If
one
DIMM
in
the
pair
fails,
the
server
runs
in
single-channel
mode
(non-interleaving).
A
failed
DIMM
must
be
replaced
as
soon
as
possible;
otherwise,
the
server
will
not
start
(boot).
v
The
DIMM-installation
sequence
is
based
on
single-rank
DIMMs,
double-rank
DIMMs,
and
mixing
single-rank
and
double-rank
DIMMs.
Single-rank
DIMMs
are
256
MB,
512
MB,
and
1
GB
memory
modules.
Double-rank
DIMMs
are
2
GB
memory
modules.
The
following
table
lists
the
DIMM-installation
sequence
for
the
server
maximum
memory
capacity
using
mixed
single-rank
and
double-rank
DIMMs.
Notes:
1.
Do
not
install
four
2
GB
double-rank
DIMMs
for
the
server
maximum
capacity
(8
GB)
configuration;
the
server
does
not
support
it.
2.
You
can
install
pairs
of
256
MB,
512
MB,
1
GB,
and
2
GB
DIMMs
in
the
server,
but
for
the
server
maximum
capacity
you
must
use
the
DIMM-sequence
in
the
table
below.
3.
You
can
install
any
combination
of
DIMM
pairs
in
the
server;
however,
you
can
install
only
two
2
GB
double-rank
DIMMs
in
the
server,
and
they
must
go
in
DIMM
connectors
1
and
2.
Do
not
install
2
GB
double-rank
DIMMs
in
any
connectors
other
than
DIMM
connectors
1
and
2.
4.
If
you
order
DIMMs
from
IBM,
the
variable
2R
in
the
description
for
the
memory
indicates
that
the
DIMM
is
a
double-rank
2
GB
DIMM.
Table
2.
Maximum
memory
capacity
(8
GB)
and
installation
sequence
mixing
single-rank
and
double-rank
DIMMs
DIMM
pair
DIMM
connectors
DIMM
size
Rank
First
pair
1,
2
2
GB
Double-rank
Second
pair
3,
4
1
GB
Single-rank
Third
pair
5,
6
1
GB
Single-rank
34
xSeries
226
Type
8488
and
8648:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide