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
Install
only
1.8
V,
240-pin,
double-data-rate
2
(DDR2),
PC2-5300,
unbuffered,
667
MHz,
synchronous
dynamic
random-access
memory
(SDRAM)
with
error
correcting
code
(ECC)
dual
inline
memory
modules
(DIMMs).
These
DIMMs
must
be
compatible
with
the
latest
PC2-5300,
667
MHz
SDRAM
unbuffered
DIMM
specification.
For
a
list
of
supported
DIMMs
for
your
server,
see
http://www.ibm.com/servers/eserver/serverproven/compat/us/.
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
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
amount
of
usable
memory
will
be
reduced
depending
on
the
system
configuration.
A
certain
amount
of
memory
must
be
reserved
for
system
resources.
The
system
summary
displays
the
total
amount
of
installed
memory
and
the
amount
of
configured
memory.
v
The
server
comes
with
one
512
MB
or
two
512
MB
DIMMs.
If
the
server
has
one
DIMM
installed,
when
you
install
an
additional
DIMM,
it
must
be
installed
in
the
DIMM
2
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
2
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
3
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
2
connectors.
However,
the
size,
speed,
type,
and
technology
of
the
DIMMs
that
you
install
in
the
DIMM
3
and
DIMM
4
connectors
must
match
each
other.
v
When
you
restart
the
server
after
you
add
or
remove
a
DIMM,
the
server
displays
a
message
that
the
memory
configuration
has
changed.
Chapter
2.
Installing
optional
devices
21
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