IBM x3400 User Guide - Page 44

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1, DIMM connector 7 (channel 2) and connector 10 (channel 3) rather than branch 0, then branch 1 will support online-sparing and branch 0 will not. - Branch 0 and branch 1 operate independently. v The following notes apply when the server operates in non-mirroring mode (normal mode): - DIMMs must be installed in matched pairs. If you install a second pair of DIMMs in DIMM connector 7 and DIMM connector 10, they do not have to be the same size, speed, type, and technology as the DIMMs in DIMM connector 1 and DIMM connector 4. However, the size, speed, type, and technology of the DIMMs that you install in DIMM connector 7 and DIMM connector 10 must match each other. - The following table shows the DIMM upgrade configuration sequence for operating in non-mirrored mode (normal mode). Table 5. DIMM upgrade configuration sequence in non-mirroring mode Number of DIMMs DIMM connectors 2 1, 4 4 1, 4, 7, 10 6 1, 4, 7, 10, 2, 5 8 1, 4, 7, 10, 2, 5, 8, 11 Note: DIMM connectors 3, 6, 9, and 12 are not functional in this server. Do not install DIMMs in these connectors. 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. To view the total amount of installed memory and the amount of configured memory, run the Configuration/Setup Utility program and select System Summary from the menu. For additional information, see Chapter 3, "Configuring the server," on page 75. v The following tables show examples of maximum memory capacity when the server operates in mirroring and non-mirroring modes, using identical single-rank, x8 technology or double-rank, x4 technology DIMMs. The memory capacity is dependent on the size and technology of the DIMMs that you install. Table 6. Example of the memory capacity when identical x8 technology single-rank DIMMs are used DIMMs installed x8 single-rank technology Memory available in Memory available in mirroring mode non-mirroring mode 8 512 Mb 2 GB 4 GB 8 1 Gb 4 GB 8 GB 8 2 Gb 8 GB 16 GB Table 7. Example of the memory capacity when identical x4 technology double-rank DIMMs are used DIMMs installed x4 double-rank technology Memory available in Memory available in mirroring mode non-mirroring mode 8 512 Mb 8 GB 16 GB 8 1 Gb 16 GB 32 GB v When you restart the server after adding or removing a DIMM, the server displays a message that the memory configuration has changed. 30 System x3400 Types 7973, 7974, 7975, and 7976: User's Guide

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1,
DIMM
connector
7
(channel
2)
and
connector
10
(channel
3)
rather
than
branch
0,
then
branch
1
will
support
online-sparing
and
branch
0
will
not.
-
Branch
0
and
branch
1
operate
independently.
v
The
following
notes
apply
when
the
server
operates
in
non-mirroring
mode
(normal
mode):
–
DIMMs
must
be
installed
in
matched
pairs.
If
you
install
a
second
pair
of
DIMMs
in
DIMM
connector
7
and
DIMM
connector
10,
they
do
not
have
to
be
the
same
size,
speed,
type,
and
technology
as
the
DIMMs
in
DIMM
connector
1
and
DIMM
connector
4.
However,
the
size,
speed,
type,
and
technology
of
the
DIMMs
that
you
install
in
DIMM
connector
7
and
DIMM
connector
10
must
match
each
other.
–
The
following
table
shows
the
DIMM
upgrade
configuration
sequence
for
operating
in
non-mirrored
mode
(normal
mode).
Table
5.
DIMM
upgrade
configuration
sequence
in
non-mirroring
mode
Number
of
DIMMs
DIMM
connectors
2
1,
4
4
1,
4,
7,
10
6
1,
4,
7,
10,
2,
5
8
1,
4,
7,
10,
2,
5,
8,
11
Note:
DIMM
connectors
3,
6,
9,
and
12
are
not
functional
in
this
server.
Do
not
install
DIMMs
in
these
connectors.
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.
To
view
the
total
amount
of
installed
memory
and
the
amount
of
configured
memory,
run
the
Configuration/Setup
Utility
program
and
select
System
Summary
from
the
menu.
For
additional
information,
see
Chapter
3,
“Configuring
the
server,”
on
page
75.
v
The
following
tables
show
examples
of
maximum
memory
capacity
when
the
server
operates
in
mirroring
and
non-mirroring
modes,
using
identical
single-rank,
x8
technology
or
double-rank,
x4
technology
DIMMs.
The
memory
capacity
is
dependent
on
the
size
and
technology
of
the
DIMMs
that
you
install.
Table
6.
Example
of
the
memory
capacity
when
identical
x8
technology
single-rank
DIMMs
are
used
DIMMs
installed
x8
single-rank
technology
Memory
available
in
mirroring
mode
Memory
available
in
non-mirroring
mode
8
512
Mb
2
GB
4
GB
8
1
Gb
4
GB
8
GB
8
2
Gb
8
GB
16
GB
Table
7.
Example
of
the
memory
capacity
when
identical
x4
technology
double-rank
DIMMs
are
used
DIMMs
installed
x4
double-rank
technology
Memory
available
in
mirroring
mode
Memory
available
in
non-mirroring
mode
8
512
Mb
8
GB
16
GB
8
1
Gb
16
GB
32
GB
v
When
you
restart
the
server
after
adding
or
removing
a
DIMM,
the
server
displays
a
message
that
the
memory
configuration
has
changed.
30
System
x3400
Types
7973,
7974,
7975,
and
7976:
User’s
Guide