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,
1.8
V,
240-pin,
667
MHz,
PC2-5300
double-data-rate
2
(DDR2),
dynamic
random-access
memory
(DRAM)
with
error
correcting
code
(ECC),
fully
buffered
dual
inline
memory
modules
(DIMMs).
These
DIMMs
must
be
compatible
with
the
latest
DDR2
667
MHz
DRAM
fully
buffered
DIMM
specification.
For
a
list
of
supported
options
for
the
server,
see
http://www.ibm.com/servers/eserver/serverproven/compat/us/;
then,
select
your
country
and
navigate
to
the
list
of
options
for
the
server.
v
The
DIMM
options
that
are
available
for
the
server
are
512
MB,
1
GB,
and
2
GB
in
x4
or
x8
technology,
single-rank
or
double-rank.
The
server
supports
a
minimum
of
1
GB
and
a
maximum
of
32
GB
(16
GB
in
mirrored
mode)
of
system
memory.
The
server
comes
with
two
512
MB
DIMMs
installed.
v
The
system
board
provides
8
functional
DIMM
connectors
and
supports
two-way
memory
interleaving
when
DIMMs
are
installed
in
pairs.
However,
DIMM
connectors
3,
6,
9,
and
12
are
not
functional.
Do
not
install
DIMMs
in
these
four
connectors
and
do
not
remove
the
DIMM
thermal
baffles
installed
in
these
connectors
unless
you
need
to
replace
the
system
board.
v
The
memory
controller
has
four
fully
buffered
DIMM
channels
that
are
organized
into
two
branches.
Each
branch
has
two
channels,
and
each
channel
controls
two
DIMMs.
DIMMs
that
are
next
to
each
other
(for
example,
DIMM
slot
1
and
DIMM
slot
4)
within
the
channels
of
a
branch
must
be
identical
in
size,
type,
speed,
and
technology.
However,
the
DIMMs
in
the
slots
above
or
below
each
other
within
the
channels
of
a
branch
do
not
have
to
be
identical
(for
example,
the
DIMMs
in
DIMM
slot
1
and
DIMM
slot
2
do
not
have
to
be
identical).
The
following
illustration
shows
how
the
memory
controller
is
organized
into
branches
and
channels
with
two
pairs
of
DIMMs
installed.
DIMM 2
DIMM 3
DIMM 1
DIMM 5
DIMM 6
DIMM 4
DIMM 8
DIMM 9
DIMM 7
DIMM 11
DIMM 12
DIMM 10
Memory Controller
Branch 0
Branch 1
Channel 0
Channel 1
Channel 2
Channel 3
v
The
server
can
operate
in
two
major
modes:
mirroring
and
non-mirroring
(normal).
The
server
can
also
operate
in
a
single-channel
mode
when
one
DIMM
is
installed.
v
The
server
supports
memory
mirroring
(mirroring
mode)
and
online-spare
memory.
–
Memory
mirroring
replicates
and
stores
data
on
DIMMs
within
two
branches
simultaneously.
You
must
enable
memory
mirroring
through
the
Configuration/Setup
Utility
program
(see
“Using
the
Configuration/Setup
Utility
program”
on
page
76).
To
enable
memory
mirroring
in
the
Configuration/Setup
Utility
program,
select
Devices
and
I/O
Ports
→
Advanced
Chipset
Control
→
Memory
Branch
Mode
.
Use
the
arrow
keys
to
change
the
Memory
Branch
Mode
setting
to
Mirror
;
then,
save
your
changes.
When
you
use
memory
mirroring,
consider
the
following
information:
28
System
x3400
Types
7973,
7974,
7975,
and
7976:
User’s
Guide
Summary of Contents for System x3400 Type 7975
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Page 126: ...112 System x3400 Types 7973 7974 7975 and 7976 User s Guide...
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Page 134: ...Part Number 44W2584 Printed in USA 1P P N 44W2584...
