IBM 8486 User Guide - Page 32

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 PC2-4200, double-data-rate 2 (DDR2) dual inline memory modules (DIMMs). v The server supports a maximum of two hard disk drives, four DIMMs, and one 5.25-inch device; or, one hard disk drive, four DIMMs, and two 5.25-inch devices; or, two hard disk drives, two DIMMs, and two 5.25-inch devices. v The system board contains four DIMM connectors and supports two-way memory interleaving. v You can install one, two, or four DIMMs in the server, but not three DIMMs. Three DIMMs are not supported. v The DIMM options that are available for the server are 256 MB, 512 MB, 1 GB, and 2 GB. The server supports a minimum of 256 MB and a maximum of 8 GB of system memory. v The amount of usable memory will be reduced depending on the system configuration. A certain amount of memory must be reserved for system resources. The BIOS will display the total amount of installed memory and the amount of configured memory. v The server comes with one 256 MB or 512 MB DIMM installed in the DIMM 1 connector. If the server has one DIMM installed, when you install an additional DIMM, it must be installed in the DIMM 3 connector, and it must be the same size, speed, type, and technology as the DIMM in the DIMM 1 connector. You can mix compatible DIMMs from various manufacturers. When one DIMM is installed, the server runs as a single-channel server. When you add a DIMM in the DIMM 3 connector, the server defaults to a dual-channel server. v DIMMs must be installed in matched pairs. If you install a second pair of DIMMs in the DIMM 2 and DIMM 4 connectors, they do not have to be the same size, speed, type, and technology as the DIMMs in the DIMM 1 and DIMM 3 connectors. However, the size, speed, type, and technology of the DIMMs you install in the DIMM 2 and DIMM 4 connectors must match each other. v Install only 1.8 V, 184-pin, double-data-rate 2 (DDR2), PC2-4200, unbuffered synchronous dynamic random-access memory (SDRAM) with error correcting code (ECC) DIMMs. These DIMMs must be compatible with the latest PC2-4200 SDRAM unbuffered DIMM specification. For a list of supported options for your server, go to http://www.ibm.com/servers/eserver/serverproven/compat/us/; then, select your country and navigate to the list of options for your computer. v When you restart the server after adding or removing a DIMM, the server displays a message that the memory configuration has changed. 20 xSeries 100 Type 8486: 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
PC2-4200,
double-data-rate
2
(DDR2)
dual
inline
memory
modules
(DIMMs).
v
The
server
supports
a
maximum
of
two
hard
disk
drives,
four
DIMMs,
and
one
5.25-inch
device;
or,
one
hard
disk
drive,
four
DIMMs,
and
two
5.25-inch
devices;
or,
two
hard
disk
drives,
two
DIMMs,
and
two
5.25-inch
devices.
v
The
system
board
contains
four
DIMM
connectors
and
supports
two-way
memory
interleaving.
v
You
can
install
one,
two,
or
four
DIMMs
in
the
server,
but
not
three
DIMMs.
Three
DIMMs
are
not
supported.
v
The
DIMM
options
that
are
available
for
the
server
are
256
MB,
512
MB,
1
GB,
and
2
GB.
The
server
supports
a
minimum
of
256
MB
and
a
maximum
of
8
GB
of
system
memory.
v
The
amount
of
usable
memory
will
be
reduced
depending
on
the
system
configuration.
A
certain
amount
of
memory
must
be
reserved
for
system
resources.
The
BIOS
will
display
the
total
amount
of
installed
memory
and
the
amount
of
configured
memory.
v
The
server
comes
with
one
256
MB
or
512
MB
DIMM
installed
in
the
DIMM
1
connector.
If
the
server
has
one
DIMM
installed,
when
you
install
an
additional
DIMM,
it
must
be
installed
in
the
DIMM
3
connector,
and
it
must
be
the
same
size,
speed,
type,
and
technology
as
the
DIMM
in
the
DIMM
1
connector.
You
can
mix
compatible
DIMMs
from
various
manufacturers.
When
one
DIMM
is
installed,
the
server
runs
as
a
single-channel
server.
When
you
add
a
DIMM
in
the
DIMM
3
connector,
the
server
defaults
to
a
dual-channel
server.
v
DIMMs
must
be
installed
in
matched
pairs.
If
you
install
a
second
pair
of
DIMMs
in
the
DIMM
2
and
DIMM
4
connectors,
they
do
not
have
to
be
the
same
size,
speed,
type,
and
technology
as
the
DIMMs
in
the
DIMM
1
and
DIMM
3
connectors.
However,
the
size,
speed,
type,
and
technology
of
the
DIMMs
you
install
in
the
DIMM
2
and
DIMM
4
connectors
must
match
each
other.
v
Install
only
1.8
V,
184-pin,
double-data-rate
2
(DDR2),
PC2-4200,
unbuffered
synchronous
dynamic
random-access
memory
(SDRAM)
with
error
correcting
code
(ECC)
DIMMs.
These
DIMMs
must
be
compatible
with
the
latest
PC2-4200
SDRAM
unbuffered
DIMM
specification.
For
a
list
of
supported
options
for
your
server,
go
to
then,
select
your
country
and
navigate
to
the
list
of
options
for
your
computer.
v
When
you
restart
the
server
after
adding
or
removing
a
DIMM,
the
server
displays
a
message
that
the
memory
configuration
has
changed.
20
xSeries
100
Type
8486:
User’s
Guide