Installing a memory module, Installing, Memory – Lenovo ThinkServer TD100x User Manual
Page 32: 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
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
options
for
the
server,
see
v
(TD100
models)
The
DIMM
options
that
are
supported
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
(reduced
to
16
GB
in
mirrored
mode)
of
system
memory.
v
(TD100x
models)
The
DIMM
options
that
are
supported
for
the
server
are
1
GB,
2
GB,
and
4
GB
in
x4
or
x8
technology,
single-rank
or
double-rank.
The
server
supports
a
minimum
of
1
GB
and
a
maximum
of
48
GB
(reduced
to
24
GB
in
mirrored
mode)
of
system
memory.
v
The
system
board
provides
eight
or
12
functional
DIMM
connectors
(depending
on
the
model)
and
supports
two-way
memory
interleaving
when
DIMMs
are
installed
in
pairs.
Note:
DIMM
connectors
3,
6,
9,
and
12
are
not
functional
for
TD100
models.
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
When
installing
multiple
pairs,
always
install
the
DIMMs
with
the
most
capacity
in
the
first
slots.
For
example,
if
you
had
a
pair
of
1
GB
DIMMs
and
a
pair
of
4
GB
DIMMs,
you
would
install
the
4
GB
DIMMs
in
slots
1
and
4.
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
connector
1
and
DIMM
connector
4)
within
the
channels
of
a
branch
must
be
identical
in
size,
type,
speed,
and
technology.
However,
the
DIMMs
in
the
connector
above
or
below
each
other
within
the
channels
of
a
branch
do
not
have
to
be
identical
(for
example,
the
DIMMs
in
DIMM
connector
1
and
DIMM
connector
2
do
not
have
to
be
identical).
The
following
illustration
shows
how
the
memory
controller
is
organized
into
branches
and
channels
with
a
pair
of
DIMMs
installed
in
each
branch.
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.
16
ThinkServer
TD100
and
TD100x
Types
4203,
4204,
4205,
4206,
6398,
6399,
6419,
and
6429:
Installation
Guide