IBM 84903bu User Guide - Page 39

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, 533/667 MHz, PC2-4200, double-data-rate 2 (DDR2) dual inline memory modules (DIMMs). v The system board contains four DIMM connectors and supports two-way memory interleaving. v The DIMM options available for the server are 512 MB, 1 GB, and 2 GB. The server supports a minimum of 512 MB and a maximum of 8 GB of system memory. v The server comes with one 512 MB DIMM or two 512 MB DIMMs installed. Depending on the DIMM sizes that you select, the server also supports two or four DIMMs. The 512 MB DIMM option kit contains one DIMM; however, the 1 GB DIMM and 2 GB option kits each contain two DIMMs. 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. To view the total amount of installed memory and the amount of configured memory, run the Configuration/Setup Utility program and select System Summary from the menu. For additional information, see Chapter 3, "Configuring the server," on page 49. v For two-way memory interleaving, DIMMs must be installed in matched pairs. If one DIMM is installed in the DIMM 1 connector, 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. 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 that 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), 533/667 MHz, PC2-4200, unbuffered synchronous dynamic random-access memory (SDRAM) with error correcting code (ECC) DIMMs. These DIMMs must be compatible with the latest DDR2 533/667 MHz SDRAM unbuffered 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 When you restart the server after adding or removing a DIMM, the server displays a message that the memory configuration has changed. Chapter 2. Installing options 25

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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,
533/667
MHz,
PC2-4200,
double-data-rate
2
(DDR2)
dual
inline
memory
modules
(DIMMs).
v
The
system
board
contains
four
DIMM
connectors
and
supports
two-way
memory
interleaving.
v
The
DIMM
options
available
for
the
server
are
512
MB,
1
GB,
and
2
GB.
The
server
supports
a
minimum
of
512
MB
and
a
maximum
of
8
GB
of
system
memory.
v
The
server
comes
with
one
512
MB
DIMM
or
two
512
MB
DIMMs
installed.
Depending
on
the
DIMM
sizes
that
you
select,
the
server
also
supports
two
or
four
DIMMs.
The
512
MB
DIMM
option
kit
contains
one
DIMM;
however,
the
1
GB
DIMM
and
2
GB
option
kits
each
contain
two
DIMMs.
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.
To
view
the
total
amount
of
installed
memory
and
the
amount
of
configured
memory,
run
the
Configuration/Setup
Utility
program
and
select
System
Summary
from
the
menu.
For
additional
information,
see
Chapter
3,
“Configuring
the
server,”
on
page
49.
v
For
two-way
memory
interleaving,
DIMMs
must
be
installed
in
matched
pairs.
If
one
DIMM
is
installed
in
the
DIMM
1
connector,
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.
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
that
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),
533/667
MHz,
PC2-4200,
unbuffered
synchronous
dynamic
random-access
memory
(SDRAM)
with
error
correcting
code
(ECC)
DIMMs.
These
DIMMs
must
be
compatible
with
the
latest
DDR2
533/667
MHz
SDRAM
unbuffered
DIMM
specification.
For
a
list
of
supported
options
for
the
server,
see
serverproven/compat/us/;
then,
select
your
country
and
navigate
to
the
list
of
options
for
the
server.
v
When
you
restart
the
server
after
adding
or
removing
a
DIMM,
the
server
displays
a
message
that
the
memory
configuration
has
changed.
Chapter
2.
Installing
options
25