Lenovo ThinkServer RD120 User Guide - Page 74

Installing, memory, module

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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 up to 12 Fully Buffered DIMM PC2-5300 512 MB, 1 GB, 2 GB, and 4 GB DIMMs, for a maximum of 48 GB of system memory. See http://www.lenovo.com/thinkserver/ for a list of memory modules that you can use with the server. Note: Because some memory is reserved for system operation, the actual usable memory size that is reported by the operating system is less than the total installed size. v The server comes with a minimum of two 512 MB DIMMs, installed in slots 1 and 4. When you install additional DIMMs, you must install two identical DIMMS at a time, in the order shown in the following table, to maintain performance. Table 3. DIMM installation sequence Pair DIMM connectors 1 1 and 4 2 7 and 10 3 2 and 5 4 8 and 11 5 3 and 6 6 9 and 12 Note: When only one pair of DIMMs is installed in the server and the BIOS code level is version 1.04 (GGE127A) or later, you can improve performance by installing the DIMMs in connectors 1 and 7 instead of 1 and 4. However, because the connectors in the pair are not on the same memory branch (see the following illustration), Advanced ECC memory protection is disabled. 60 ThinkServer RD120 Types 6444, 6445, 6446, and 6447: User Guide

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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
up
to
12
Fully
Buffered
DIMM
PC2-5300
512
MB,
1
GB,
2
GB,
and
4
GB
DIMMs,
for
a
maximum
of
48
GB
of
system
memory.
See
for
a
list
of
memory
modules
that
you
can
use
with
the
server.
Note:
Because
some
memory
is
reserved
for
system
operation,
the
actual
usable
memory
size
that
is
reported
by
the
operating
system
is
less
than
the
total
installed
size.
v
The
server
comes
with
a
minimum
of
two
512
MB
DIMMs,
installed
in
slots
1
and
4.
When
you
install
additional
DIMMs,
you
must
install
two
identical
DIMMS
at
a
time,
in
the
order
shown
in
the
following
table,
to
maintain
performance.
Table
3.
DIMM
installation
sequence
Pair
DIMM
connectors
1
1
and
4
2
7
and
10
3
2
and
5
4
8
and
11
5
3
and
6
6
9
and
12
Note:
When
only
one
pair
of
DIMMs
is
installed
in
the
server
and
the
BIOS
code
level
is
version
1.04
(GGE127A)
or
later,
you
can
improve
performance
by
installing
the
DIMMs
in
connectors
1
and
7
instead
of
1
and
4.
However,
because
the
connectors
in
the
pair
are
not
on
the
same
memory
branch
(see
the
following
illustration),
Advanced
ECC
memory
protection
is
disabled.
60
ThinkServer
RD120
Types
6444,
6445,
6446,
and
6447:
User
Guide