Installing a memory module, Installing, Memory – Lenovo RD120 User Manual
Page 74: Module
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