Memory
DIMM
installation
See
the
ServerProven
®
list
at
on
the
World
Wide
Web
for
a
list
of
memory
modules
you
can
use
with
the
xSeries
455
server.
Review
the
following
guidelines
before
installing
additional
memory
in
the
xSeries
455
server:
v
The
xSeries
455
server
supports
512
MB,
1
GB,
and
2
GB
DIMMs,
for
a
maximum
of
56
GB
of
system
memory.
The
server
supports
2.5
V,
184-pin,
PC2100,
ECC
DDR
SDRAM,
133
MHZ
DIMMs.
v
The
xSeries
455
server
comes
with
a
minimum
of
two
512
MB
DIMMs,
installed
in
slots
1
and
14.
v
When
installing
additional
DIMMs,
you
must
install
two
DIMMS
at
a
time.
Each
DIMM
in
a
pair
must
be
of
the
same
size
and
technology
to
ensure
that
the
server
will
operate
correctly.
v
When
using
memory
mirroring,
you
must
install
two
pairs
of
DIMMs
at
a
time.
The
four
DIMMs
in
each
set
must
be
identical.
v
You
can
replace
a
failed
DIMM
while
the
server
is
on,
provided
that
you
have
enabled
memory
mirroring
and
that
you
have
installed
all
DIMMs
in
the
sequence
to
support
memory
mirroring.
See
the
IBM
Eserver
xSeries
455
Option
Installation
Guide
on
the
IBM
xSeries
Documentation
CD
for
complete
memory-installation
instructions.
POST
reports
incorrect
amount
of
installed
memory
Description:
POST
reports
less
memory
than
the
amount
of
memory
installed
in
the
server.
Solution:
To
correct
or
isolate
the
problem,
complete
the
following
procedures:
v
Verify
that
the
installed
DIMMs
are
supported
on
the
xSeries
455
server.
v
Reseat
the
DIMMs
and
VRMs
to
make
sure
that
they
are
correctly
installed
and
fully
seated
in
the
connectors.
v
Using
the
Configuration/Setup
Utility
program,
make
sure
that
the
DIMM
connectors
are
enabled.
v
Make
sure
that
the
DIMM
configuration
of
port
1
is
identical
to
the
DIMM
configuration
of
port
2
before
you
enable
memory
mirroring.
If
the
memory-port
configurations
are
not
identical
when
you
enable
memory
mirroring,
the
server
will
disable
the
connectors
associated
with
the
unmatched
DIMMS.
Microprocessors
Related
topics:
Microprocessor
installation
and
replacement
requirements
Attention:
To
avoid
irreparable
damage
to
the
microprocessor,
processor-board
assembly,
or
other
server
components
when
you
install
additional
microprocessors
or
replace
existing
microprocessors,
observe
the
following
guidelines:
v
The
socket
for
the
Itanium
microprocessor
has
a
locking
mechanism
that
is
very
difficult
to
see
when
the
microprocessor
assembly
is
in
place.
Before
you
attempt
to
seat
a
microprocessor
in
the
socket,
be
sure
to
become
familiar
with
the
Chapter
2.
Hints
and
tips
13
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