Lenovo ThinkCentre M50 User Manual - Page 74

Microprocessor

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The following illustration shows the locations of parts on the system board. 1 Microprocessor 2 DIMM connector 1 3 DIMM connector 2 4 DIMM connector 3 5 DIMM connector 4 6 Power connector 7 Diskette drive connector 8 PATA primary IDE connector 9 PATA secondary IDE connector 10 SATA 1 IDE connector 11 SATA 2 IDE connector 12 Promise of value (POV) daughter card (some models) 13 Clear CMOS/Recovery jumper 14 Battery 15 SCSI LED connector 16 PCI slots 17 Front panel audio connector 18 CD-ROM audio connector 19 AGP slot Installing memory Your computer has four connectors for installing dual inline memory modules (DIMMs) that provide up to a maximum of 4.0 GB of system memory. When installing DIMMs, the following rules apply: v System memory is divided into two channels (channel A and B). DIMM connectors 1 and 2 are channel A, and DIMM connectors 3 and 4 are channel B. v If DIMM connectors 1 and 3 (or 2 and 4) are filled with the same technology and size of memory, the system operates in dual channel mode. v Use 2.5 V, 184-pin, 333 MHz double data rate synchronous dynamic random access memory (DDR SDRAM). v Use 128 MB, 256 MB, 512 MB, or 1.0 GB (when available) DIMMs in any combination. v DIMMs are 25.4 mm (1.0 inch) in height. Note: Only DDR SDRAM DIMMs can be used. 58 User Guide

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The
following
illustration
shows
the
locations
of
parts
on
the
system
board.
±1²
Microprocessor
±11²
SATA
2
IDE
connector
±2²
DIMM
connector
1
±12²
Promise
of
value
(POV)
daughter
card
(some
models)
±3²
DIMM
connector
2
±13²
Clear
CMOS/Recovery
jumper
±4²
DIMM
connector
3
±14²
Battery
±5²
DIMM
connector
4
±15²
SCSI
LED
connector
±6²
Power
connector
±16²
PCI
slots
±7²
Diskette
drive
connector
±17²
Front
panel
audio
connector
±8²
PATA
primary
IDE
connector
±18²
CD-ROM
audio
connector
±9²
PATA
secondary
IDE
connector
±19²
AGP
slot
±10²
SATA
1
IDE
connector
Installing
memory
Your
computer
has
four
connectors
for
installing
dual
inline
memory
modules
(DIMMs)
that
provide
up
to
a
maximum
of
4.0
GB
of
system
memory.
When
installing
DIMMs,
the
following
rules
apply:
v
System
memory
is
divided
into
two
channels
(channel
A
and
B).
DIMM
connectors
1
and
2
are
channel
A,
and
DIMM
connectors
3
and
4
are
channel
B.
v
If
DIMM
connectors
1
and
3
(or
2
and
4)
are
filled
with
the
same
technology
and
size
of
memory,
the
system
operates
in
dual
channel
mode.
v
Use
2.5
V,
184-pin,
333
MHz
double
data
rate
synchronous
dynamic
random
access
memory
(DDR
SDRAM).
v
Use
128
MB,
256
MB,
512
MB,
or
1.0
GB
(when
available)
DIMMs
in
any
combination.
v
DIMMs
are
25.4
mm
(1.0
inch)
in
height.
Note:
Only
DDR
SDRAM
DIMMs
can
be
used.
58
User
Guide