Lenovo ThinkCentre M51 User Manual - Page 28

Installing, memory, module

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The following illustration shows the locations of parts on the system board. 1 12V power connector 2 Diskette drive connector 3 Speaker connector 4 Memory module connector 4 5 Memory module connector 3 6 Memory module connector 2 7 Memory module connector 1 8 Clear CMOS/Recovery jumper 9 Front Panel connector 10 PATA IDE connector 11 SATA 4 IDE connector 12 SATA 3 IDE connector 13 SATA 2 IDE connector 14 SATA 1 IDE connector 15 Cover presence switch connector 16 Power supply connector 17 PCI Express x16 graphics adapter connector 18 PCI Express x1 adapter connector 19 PCI connector 20 PCI connector 21 Battery 22 Microprocessor 23 Microprocessor fan connector 24 Microprocessor heat sink Installing a memory module Your computer has four connectors for installing dual inline memory modules that provide up to a maximum of 4.0 GB of system memory. Note: Addressable memory might be less than total supported memory. System memory is divided into two channels (channel A and B). Memory module connectors 1 and 2 are designated as channel A, and memory module connectors 3 and 4 are designated as channel B. If memory modules are present in both channels, your computer operates in dual channel mode. Your computer has either double data rate (DDR) or double data rate 2 (DDR2) memory. The type of memory required depends on the system board that is installed. 12 User Guide

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The
following
illustration
shows
the
locations
of
parts
on
the
system
board.
±1²
12V
power
connector
±13²
SATA
2
IDE
connector
±2²
Diskette
drive
connector
±14²
SATA
1
IDE
connector
±3²
Speaker
connector
±15²
Cover
presence
switch
connector
±4²
Memory
module
connector
4
±16²
Power
supply
connector
±5²
Memory
module
connector
3
±17²
PCI
Express
x16
graphics
adapter
connector
±6²
Memory
module
connector
2
±18²
PCI
Express
x1
adapter
connector
±7²
Memory
module
connector
1
±19²
PCI
connector
±8²
Clear
CMOS/Recovery
jumper
±20²
PCI
connector
±9²
Front
Panel
connector
±21²
Battery
±10²
PATA
IDE
connector
±22²
Microprocessor
±11²
SATA
4
IDE
connector
±23²
Microprocessor
fan
connector
±12²
SATA
3
IDE
connector
±24²
Microprocessor
heat
sink
Installing
a
memory
module
Your
computer
has
four
connectors
for
installing
dual
inline
memory
modules
that
provide
up
to
a
maximum
of
4.0
GB
of
system
memory.
Note:
Addressable
memory
might
be
less
than
total
supported
memory.
System
memory
is
divided
into
two
channels
(channel
A
and
B).
Memory
module
connectors
1
and
2
are
designated
as
channel
A,
and
memory
module
connectors
3
and
4
are
designated
as
channel
B.
If
memory
modules
are
present
in
both
channels,
your
computer
operates
in
dual
channel
mode.
Your
computer
has
either
double
data
rate
(DDR)
or
double
data
rate
2
(DDR2)
memory.
The
type
of
memory
required
depends
on
the
system
board
that
is
installed.
12
User
Guide