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.
It
is
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
memory
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/us/compat/;
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.
Chapter
2.
Installing
options
11
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