IBM 8862 Hardware Maintenance Manual - Page 49

Memory, modules

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Memory modules The following notes describe the types of dual inline memory modules (DIMMs) that your server supports and other information that you must consider when installing DIMMs: v Your server supports 2.5 V, 184-pin, error correcting code (ECC), double-data rate (DDR) SDRAM, PC2100 registered DIMMs with Chipkill memory protection. v DIMMs can be removed and replaced through the of the memory cassette. v You can increase the amount of memory in the server by replacing the DIMMs with higher-capacity DIMMs or installing additional pairs of DIMMs in open sockets. The server supports 512 MB, 1 GB, and 2 GB DIMMs. See the ServerProven® list at http://www.ibm.com/pc/compat/ for an updated list of memory modules supported by the server. v For a server with an 8-DIMM-connector memory cassette, you can increase the memory capabilities of your server by upgrading to the 16-connector memory cassette. The 16-connector memory cassette supports memory mirroring and Memory ProteXion. See the ServerProven list at http://www.ibm.com/pc/compat/ for a list of memory cassettes supported by the server. More information on Memory ProteXion and memory mirroring is available in the User's Guide on the xSeries Documentation CD. v The server uses interleaved DIMMs, which requires that you install DIMMs in specific configurations: - In the 8-DIMM-connector memory cassette, install DIMMs in pairs. Each pair must be of the same type, capacity, and speed. The DIMM connectors are arranged in two groups of four rows each; the server comes with one pair of DIMMs installed in DIMM connectors 1 and 5 in the memory cassette. - In the 16-DIMM memory cassette, the DIMM connectors are arranged in two groups of eight rows each. In non-mirrored mode, install DIMMs in pairs; in mirrored mode, install DIMMs in quads, or groups of 4. Each pair or quad must be of the same type, capacity, and speed. v You must populate the DIMM connectors in the following order with the largest size first: 8-DIMM memory board First pair Second pair Third pair Fourth pair DIMMs 1 and 5 DIMMs 2 and 6 DIMMs 3 and 7 DIMMs 4 and 8 16-DIMM memory board in non-mirrored mode First pair Second pair Third pair Fourth pair Fifth pair Sixth pair Seventh pair Eighth pair DIMMs 1 and 3 DIMMs 14 and 16 DIMMs 2 and 4 DIMMs 13 and 15 DIMMs 5 and 7 DIMMs 10 and 12 DIMMs 6 and 8 DIMMs 9 and 11 Chapter 4. Installing options 39

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Memory
modules
The
following
notes
describe
the
types
of
dual
inline
memory
modules
(DIMMs)
that
your
server
supports
and
other
information
that
you
must
consider
when
installing
DIMMs:
v
Your
server
supports
2.5
V,
184-pin,
error
correcting
code
(ECC),
double-data
rate
(DDR)
SDRAM,
PC2100
registered
DIMMs
with
Chipkill
memory
protection.
v
DIMMs
can
be
removed
and
replaced
through
the
of
the
memory
cassette.
v
You
can
increase
the
amount
of
memory
in
the
server
by
replacing
the
DIMMs
with
higher-capacity
DIMMs
or
installing
additional
pairs
of
DIMMs
in
open
sockets.
The
server
supports
512
MB,
1
GB,
and
2
GB
DIMMs.
See
the
ServerProven
®
list
at
for
an
updated
list
of
memory
modules
supported
by
the
server.
v
For
a
server
with
an
8-DIMM-connector
memory
cassette,
you
can
increase
the
memory
capabilities
of
your
server
by
upgrading
to
the
16-connector
memory
cassette.
The
16-connector
memory
cassette
supports
memory
mirroring
and
Memory
ProteXion.
See
the
ServerProven
list
at
for
a
list
of
memory
cassettes
supported
by
the
server.
More
information
on
Memory
ProteXion
and
memory
mirroring
is
available
in
the
User’s
Guide
on
the
xSeries
Documentation
CD.
v
The
server
uses
interleaved
DIMMs,
which
requires
that
you
install
DIMMs
in
specific
configurations:
–
In
the
8-DIMM-connector
memory
cassette,
install
DIMMs
in
pairs.
Each
pair
must
be
of
the
same
type,
capacity,
and
speed.
The
DIMM
connectors
are
arranged
in
two
groups
of
four
rows
each;
the
server
comes
with
one
pair
of
DIMMs
installed
in
DIMM
connectors
1
and
5
in
the
memory
cassette.
–
In
the
16-DIMM
memory
cassette,
the
DIMM
connectors
are
arranged
in
two
groups
of
eight
rows
each.
In
non-mirrored
mode,
install
DIMMs
in
pairs;
in
mirrored
mode,
install
DIMMs
in
quads,
or
groups
of
4.
Each
pair
or
quad
must
be
of
the
same
type,
capacity,
and
speed.
v
You
must
populate
the
DIMM
connectors
in
the
following
order
with
the
largest
size
first:
8-DIMM
memory
board
First
pair
DIMMs
1
and
5
Second
pair
DIMMs
2
and
6
Third
pair
DIMMs
3
and
7
Fourth
pair
DIMMs
4
and
8
16-DIMM
memory
board
in
non-mirrored
mode
First
pair
DIMMs
1
and
3
Second
pair
DIMMs
14
and
16
Third
pair
DIMMs
2
and
4
Fourth
pair
DIMMs
13
and
15
Fifth
pair
DIMMs
5
and
7
Sixth
pair
DIMMs
10
and
12
Seventh
pair
DIMMs
6
and
8
Eighth
pair
DIMMs
9
and
11
Chapter
4.
Installing
options
39