Lenovo ThinkCentre M55 (English) User guide - Page 37

Installing, memory

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The following illustration shows the locations of parts on the system board. 1 Battery 2 SATA connector (hard drive cable) 3 Optical drive connector 4 PCI riser connector 5 Front panel connector 6 12v power connector 7 Power connector 8 Front fan connector 9 Microprocessor 10 Internal speaker connector 11 Memory connector 1 12 Memory connector 2 13 Microprocessor fan connector 14 Clear CMOS/Recovery jumper 15 Temperature sensor connector 16 System fan connector 17 Cover presence switch Installing memory Your computer has two connectors for installing double date rate 2 dual inline memory modules (DDR2 DIMMs) that provide up to a maximum of 4.0 GB of system memory. When installing memory modules, the following rules apply: v Use 1.8 V, 240-pin, double data rate 2 synchronous dynamic random access memory (DDR2 SDRAM). v Use 256 MB, 512 MB, 1.0 GB, or 2.0 GB memory modules in any combination up to a maximum of 4.0 GB. Note: Only DDR2 SDRAM memory modules can be used. Chapter 3. Installing options 21

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The
following
illustration
shows
the
locations
of
parts
on
the
system
board.
±1²
Battery
±10²
Internal
speaker
connector
±2²
SATA
connector
(hard
drive
cable)
±11²
Memory
connector
1
±3²
Optical
drive
connector
±12²
Memory
connector
2
±4²
PCI
riser
connector
±13²
Microprocessor
fan
connector
±5²
Front
panel
connector
±14²
Clear
CMOS/Recovery
jumper
±6²
12v
power
connector
±15²
Temperature
sensor
connector
±7²
Power
connector
±16²
System
fan
connector
±8²
Front
fan
connector
±17²
Cover
presence
switch
±9²
Microprocessor
Installing
memory
Your
computer
has
two
connectors
for
installing
double
date
rate
2
dual
inline
memory
modules
(DDR2
DIMMs)
that
provide
up
to
a
maximum
of
4.0
GB
of
system
memory.
When
installing
memory
modules,
the
following
rules
apply:
v
Use
1.8
V,
240-pin,
double
data
rate
2
synchronous
dynamic
random
access
memory
(DDR2
SDRAM).
v
Use
256
MB,
512
MB,
1.0
GB,
or
2.0
GB
memory
modules
in
any
combination
up
to
a
maximum
of
4.0
GB.
Note:
Only
DDR2
SDRAM
memory
modules
can
be
used.
Chapter
3.
Installing
options
21