IBM 4368E3U User Manual - Page 41

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 you install DIMMs: v The server supports only industry-standard, 1.8 V, 240-pin double-data-rate 2 (DDR2), 667 or 800 MHz, PC2-5300 or PC2-6400, unbuffered, synchronous dynamic random-access memory (SDRAM) dual inline memory modules (DIMMs) with error correcting code (ECC). These DIMMs must be compatible with the latest DDR2 667 or 800 MHz SDRAM unbuffered DIMM specification. For a list of supported optional devices for the server, see http://www.ibm.com/servers/ eserver/serverproven/compat/us/. v The optional DIMMs that are 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 Some servers come with one 512 MB DIMM, two 512 MB DIMMs, or two 1 GB DIMMs installed. Depending on the DIMM sizes that are installed in your server, the server can support one, 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 system board contains four DIMM connectors and supports two-way memory interleaving. 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 use 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 The maximum operating speed of the server is determined by the slowest DIMM in the server. v The server can operate in single-channel mode or dual-channel mode. v DIMM population is based on single-rank, double-rank, or combined single-rank and double-rank DIMMs. DIMMs must be installed in order, starting with the DIMM connector that is farthest from the memory controller hub. Double-rank DIMMs must be installed in the DIMM connector that is farthest from the memory controller hub when you install a combination of single-rank and double-rank DIMMs. The following tables show examples of populating the server with different combinations of single-rank and double-rank DIMMs and different operating modes. Table 2. Single-channel mode with single-rank and double-rank DIMMs Channel 0 Channel 1 DIMM 1 DIMM 2 DIMM 3 DIMM 4 Single-rank Double-rank Single-rank Single-rank Chapter 2. Installing optional devices 27

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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
you
install
DIMMs:
v
The
server
supports
only
industry-standard,
1.8
V,
240-pin
double-data-rate
2
(DDR2),
667
or
800
MHz,
PC2-5300
or
PC2-6400,
unbuffered,
synchronous
dynamic
random-access
memory
(SDRAM)
dual
inline
memory
modules
(DIMMs)
with
error
correcting
code
(ECC).
These
DIMMs
must
be
compatible
with
the
latest
DDR2
667
or
800
MHz
SDRAM
unbuffered
DIMM
specification.
For
a
list
of
supported
optional
devices
for
the
server,
see
eserver/serverproven/compat/us/.
v
The
optional
DIMMs
that
are
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
Some
servers
come
with
one
512
MB
DIMM,
two
512
MB
DIMMs,
or
two
1
GB
DIMMs
installed.
Depending
on
the
DIMM
sizes
that
are
installed
in
your
server,
the
server
can
support
one,
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
system
board
contains
four
DIMM
connectors
and
supports
two-way
memory
interleaving.
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
use
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
The
maximum
operating
speed
of
the
server
is
determined
by
the
slowest
DIMM
in
the
server.
v
The
server
can
operate
in
single-channel
mode
or
dual-channel
mode.
v
DIMM
population
is
based
on
single-rank,
double-rank,
or
combined
single-rank
and
double-rank
DIMMs.
DIMMs
must
be
installed
in
order,
starting
with
the
DIMM
connector
that
is
farthest
from
the
memory
controller
hub.
Double-rank
DIMMs
must
be
installed
in
the
DIMM
connector
that
is
farthest
from
the
memory
controller
hub
when
you
install
a
combination
of
single-rank
and
double-rank
DIMMs.
The
following
tables
show
examples
of
populating
the
server
with
different
combinations
of
single-rank
and
double-rank
DIMMs
and
different
operating
modes.
Table
2.
Single-channel
mode
with
single-rank
and
double-rank
DIMMs
Channel
0
Channel
1
DIMM
1
DIMM
2
DIMM
3
DIMM
4
Single-rank
Double-rank
Single-rank
Single-rank
Chapter
2.
Installing
optional
devices
27