IBM 86481BU Installation Guide - Page 31

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(non-interleaving). A failed DIMM must be replaced as soon as possible; otherwise, the computer will not start (boot). v The DIMM-installation sequence is based on single-rank, double-rank, and mixing single-rank and double-rank memory 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 computer 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 memory 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 v The DIMM options that are available for your server are 256 MB, 512 MB, 1 GB, and 2 GB memory modules. The server supports a minimum of 256 MB and a maximum of 8 MB (when using 2 GB double-rank DIMMs) of system memory. Important: Although the server supports a maximum of 8 GB of system memory, some Microsoft Windows operating systems recognize and support only a lesser amount of system memory, as shown in the following table. Windows operating system Windows Server 2003, Web Edition Windows Server 2003, Standard Edition Maximum memory supported 2 GB 4 GB v The memory controller in the computer provides Chipkill™ memory protection if the DIMMs are 1 GB or larger, or if the computer is populated with 512 MB x4 DIMMs. Chipkill memory protection is a technology that protects the computer from a single chip failure on a DIMM. v The amount of usable memory is reduced depending on the system configuration. A certain amount of memory must be reserved for system resources. The BIOS displays the total amount of installed memory and the amount of configured memory. Complete the following steps to install a DIMM: 1. Read the safety information beginning on page vii and "Installation guidelines" on page 11. 2. Turn off the server and peripheral devices, and disconnect the power cords and all external cables. Chapter 2. Installing options 17

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(non-interleaving).
A
failed
DIMM
must
be
replaced
as
soon
as
possible;
otherwise,
the
computer
will
not
start
(boot).
v
The
DIMM-installation
sequence
is
based
on
single-rank,
double-rank,
and
mixing
single-rank
and
double-rank
memory
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
computer
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
memory
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
v
The
DIMM
options
that
are
available
for
your
server
are
256
MB,
512
MB,
1
GB,
and
2
GB
memory
modules.
The
server
supports
a
minimum
of
256
MB
and
a
maximum
of
8
MB
(when
using
2
GB
double-rank
DIMMs)
of
system
memory.
Important:
Although
the
server
supports
a
maximum
of
8
GB
of
system
memory,
some
Microsoft
Windows
operating
systems
recognize
and
support
only
a
lesser
amount
of
system
memory,
as
shown
in
the
following
table.
Windows
operating
system
Maximum
memory
supported
Windows
Server
2003,
Web
Edition
2
GB
Windows
Server
2003,
Standard
Edition
4
GB
v
The
memory
controller
in
the
computer
provides
Chipkill
™
memory
protection
if
the
DIMMs
are
1
GB
or
larger,
or
if
the
computer
is
populated
with
512
MB
x4
DIMMs.
Chipkill
memory
protection
is
a
technology
that
protects
the
computer
from
a
single
chip
failure
on
a
DIMM.
v
The
amount
of
usable
memory
is
reduced
depending
on
the
system
configuration.
A
certain
amount
of
memory
must
be
reserved
for
system
resources.
The
BIOS
displays
the
total
amount
of
installed
memory
and
the
amount
of
configured
memory.
Complete
the
following
steps
to
install
a
DIMM:
1.
Read
the
safety
information
beginning
on
page
vii
and
“Installation
guidelines”
on
page
11.
2.
Turn
off
the
server
and
peripheral
devices,
and
disconnect
the
power
cords
and
all
external
cables.
Chapter
2.
Installing
options
17