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
comes
with
either
two
256
MB
or
two
512
MB
memory
DIMMs
installed
in
DIMM
1
and
DIMM
2
memory
connectors.
The
second
pair
of
DIMMs
must
be
installed
in
DIMM
3
and
DIMM
4
memory
connectors
and
the
third
pair
in
DIMM
5
and
DIMM
6
memory
connectors.
v
DIMMs
must
be
installed
in
matched
pairs.
The
DIMMs
in
each
pair
must
be
the
same
size,
speed,
type,
and
technology
as
each
other
but
do
not
have
to
match
the
other
pairs.
You
can
mix
compatible
DIMMs
from
various
manufacturers.
v
Install
only
1.8
V,
184-pin,
double-data-rate
2
(DDR2),
PC2-3200,
registered,
synchronous
dynamic
random-access
memory
(SDRAM)
with
error
correcting
code
(ECC),
dual
inline
memory
modules
(DIMMs).
These
DIMMs
must
be
compatible
with
the
latest
PC2-3200
SDRAM
buffered
DIMM
specification.
For
a
list
of
supported
options
for
your
server,
go
to
http://www.ibm.com/pc/;
then,
select
your
country
and
navigate
to
the
list
of
options
for
your
server.
v
The
system
board
contains
six
DIMM
connectors
and
supports
two-way
memory
interleaving
when
the
DIMMs
are
installed
in
pairs
and
functioning
properly.
If
one
DIMM
in
the
pair
fails,
the
computer
runs
in
single-channel
mode
(non-interleaving).
A
failed
DIMM
must
be
replaced
as
soon
as
possible;
otherwise,
the
computer
will
not
start
(boot).
v
The
DIMM-installation
sequence
is
based
on
single-rank,
double-rank,
and
mixing
single-rank
and
double-rank
memory
DIMMs.
Single-rank
DIMMs
are
256
MB,
512
MB,
and
1
GB
memory
modules.
Double-rank
DIMMs
are
2
GB
memory
modules.
The
following
table
lists
the
DIMM-installation
sequence
for
the
server
maximum
memory
capacity
using
mixed
single-rank
and
double-rank
DIMMs.
Notes:
1.
Do
not
install
four,
2
GB
double-rank
DIMMs
for
the
server
maximum
capacity
(8
GB)
configuration,
the
server
does
not
support
it.
2.
You
can
install
pairs
of
256
MB,
512
MB,
1
GB,
and
2
GB
DIMMs
in
the
server,
but
for
the
server
maximum
capacity,
you
must
use
the
DIMM-sequence
in
the
table
below.
3.
You
can
install
any
combination
of
DIMM
pairs
in
the
server;
however,
you
can
install
only
two,
2
GB
double-rank
DIMMs
in
the
computer
and
they
must
go
in
DIMM
connectors
1
and
2.
Do
not
install
2
GB
double-rank
DIMMs
in
any
connectors
other
than
DIMM
connectors
1
and
2.
4.
If
you
order
memory
DIMMs
from
IBM,
the
variable
2R
in
the
description
indicates
that
the
DIMM
is
a
double-rank
2
GB
DIMM.
Table
1.
Maximum
memory
capacity
(8
GB)
and
installation
sequence
mixing
single-rank
and
double-rank
DIMMs
DIMM
pair
DIMM
connectors
DIMM
size
Rank
First
pair
1,
2
2
GB
Double-rank
Second
pair
3,
4
1
GB
Single-rank
Third
pair
5,
6
1
GB
Single-rank
v
The
DIMM
options
that
are
available
for
your
server
are
256
MB,
512
MB,
1
GB,
and
2
GB
memory
modules.
The
server
supports
a
minimum
of
256
MB
and
a
maximum
of
8
MB
(when
using
2
GB
double-rank
DIMMs)
of
system
memory.
14
xSeries
226
Type
8648:
Option
Installation
Guide
Содержание eServer xSeries 226 Type 8648
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