Gigabyte Ga945gcmxs2 User Guide

							Hardware Installation - 21 -
English1/2) ATX_12V / ATX (Power Connector)
With the use of the power connector, the power supply can supply enough stable power to all the
components on the motherboard.  Before connecting the power connector, please make sure that
all components and devices are properly installed.  Align the power connector with its proper
location on the motherboard and connect tightly.
The ATX_12V power connector mainly supplies power to the CPU.  If the ATX_12V power
connector is not connected, the system will not start.
Caution!  Please use a power supply that is able to handle the system voltage requirements.  It is
recommended that a power supply that can withstand high power consumption be used (300W or
greater).  If a power supply is used that does not provide the required power, the result can lead to an
unstable system or a system that is unable to start.  If you use  a power supply that provides a 24-pin
ATX power connector, please remove the small cover on the power connector on the motherboard
before plugging in the power cord; otherwise, please do not remove it.
13 124 12
Pin No. Definition
13 3.3V
14 -12V
15 GND
16 PS_ON(soft On/Off)
17 GND
18 GND
19 GND
20 -5V
21 +5V
22 +5V
23 +5V (Only for 24-pin  ATX)
24 GND(Only for 24-pin  ATX)
Pin No. Definition
1 3.3V
2 3.3V
3 GND
4 +5V
5 GND
6 +5V
7 GND
8 Power Good
9 5V SB(stand by +5V)
10 +12V
11 +12V(Only for 24-pin  ATX)
12  3.3V(Only for 24-pin  ATX)
Pin No. Definition
1 GND
2 GND
3 +12V
4 +12V
1 32
4
ATXATX_12V 
						

							GA-945GCM(X)-S2 Motherboard - 22 -
English
3/4) CPU_FAN / SYS_FAN (Cooler Fan Power Connector)
The cooler fan power connector supplies a +12V power voltage via a 3-pin/4-pin(CPU_FAN)
power connector and possesses a foolproof connection design.
Most coolers are designed with color-coded power connector wires. A red power connector wire
indicates a positive connection and requires a +12V power voltage. The black connector wire is
the ground wire (GND).
Remember to connect the CPU/system fan cable to the CPU_FAN/SYS_FAN connector to pre-
vent CPU damage or system hanging caused by overheating.
1
Pin No. Definition
1 GND
2 +12V / Speed Control
3 Sense
4 Speed Control
SYS_FANCPU_FAN :
Pin No. Definition
1 GND
2 +12V
3 Sense
SYS_FAN :
5) FDD (Floppy Connector)
The FDD connector is used to connect the FDD cable while the other end of the cable connects to
the FDD drive. The types of FDD drives supported are: 360 KB, 720 KB, 1.2 MB, 1.44 MB and
2.88 MB. Before attaching the FDD cable, please take note of the foolproof groove in the FDD
connector.
CPU_FAN1
2 34
133 
						

							Hardware Installation - 23 -
English6) IDE (IDE Connector)
An IDE device connects to the computer via an IDE connector. One IDE connector can connect to one
IDE cable, and the single IDE cable can then connect to two IDE devices (hard drive or optical drive).
If you wish to connect two IDE devices, please set the jumper on one IDE device as Master and the
other as Slave (for information on settings, please refer to the instructions located on the IDE device).
Before attaching the IDE cable, please take note of the foolproof groove in the IDE connector.
7) SATAII0 / 1 / 2 / 3 (SATA 3Gb/s Connector, Controlled by ICH7)
SATA 3Gb/s can provide up to 300 MB/s transfer rate. Please refer to the BIOS setting for the SATA
3Gb/s and install the proper driver in order to work properly.
Pin No. Definition
1 GND
2 TXP
3 TXN
4 GND
5RXN
6 RXP
7 GND
2 40
1 39
1 77 1
1 77 1SATAII3
SATAII1 SATAII0 SATAII2 
						

							GA-945GCM(X)-S2 Motherboard - 24 -
English
8) PWR_LED
The PWR_LED connector is connected with the system power indicator to indicate whether the
system is on/off. It will blink when the system enters suspend mode(S1).
Pin No. Definition
1 MPD+
2 MPD-
3 MPD-1
9) BATTERY
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended
by the manufacturer.
Dispose of used batteries according to the manufacturers
instructions.
If you want to erase CMOS...
1. Turn off the computer and unplug the power cord.
2. Gently take out the battery and put it aside for about one minute.
(Or you can use a  metal object to connect the positive and
negative pins in the battery holder to make them short for five
seconds.)
3. Re-install the battery.
4. Plug the power cord  in  and turn on the computer. 
						

							Hardware Installation - 25 -
English10) F_PANEL (Front Panel Jumper)
Please connect the power LED, PC speaker, reset switch and power switch etc. of your chassis
front panel to the F_PANEL connector according to the pin assignment below.
MSG (Message LED/Power/Sleep LED) Pin 1: LED anode(+)
Pin 2: LED cathode(-)
PW (Power Switch)Open: Normal
Close: Power On/Off
SPEAK (Speaker Connector)Pin 1: Power
Pin 2- Pin 3: NC
Pin 4: Data(-)
HD (IDE Hard Disk Active LED) Pin 1: LED anode(+)
Pin 2: LED cathode(-)
RES (Reset Switch)Open: Normal
Close: Reset Hardware System
NC NC
12
1920
HD- HD+
RES+ RES-
NC
IDE Hard Disk Active LED
Reset Switch
SPEAK- MSG-MSG+
PW-PW+
Message LED/
Power/
Sleep LEDSpeaker Connector
SPEAK+
Power
Switch 
						

							GA-945GCM(X)-S2 Motherboard - 26 -
English
12) CD_IN (CD IN Connector)
Connect CD-ROM or DVD-ROM audio out to the connector.
Pin No. Definition
1 CD-L
2 GND
3 GND
4 CD-R
1
11) F_AUDIO (Front Audio Connector)
This connector supports either HD (High Definition) or AC97 front panel audio module. If you wish
to use the front audio function, connect the front panel audio module to this connector. Check the pin
assignments carefully while you connect the front panel audio module. Incorrect connection
between the module and connector will make the audio device unable to work or even damage it.
For optional front panel audio module, please contact your chassis manufacturer.
By default, the audio driver is configured to support HD Audio. To connect an AC97 front panel
audio module to this connector, please refer to the instructions on page 68 about the software
settings.
Pin No. Definition
1 MIC
2 GND
3 MIC Power
4NC
5 Line Out (R)
6NC
7NC
8 No Pin
9 Line Out (L)
10 NC AC97 Audio:
Pin No. Definition
1 MIC2_L
2 GND
3 MIC2_R
4 -ACZ_DET
5 LINE2_R
6 FSENSE1
7 FAUDIO_JD
8 No Pin
9 LINE2_L
10 FSENSE2 HD Audio:
1 29 10 
						

							Hardware Installation - 27 -
English13) SPDIF_IO (S/PDIF In/Out Connector)
The S/PDIF output is capable of providing digital audio to external speakers or compressed AC3
data to an external Dolby Digital Decoder.  Use this feature only when your stereo system has
digital input function. Use S/PDIF IN  feature only when your device has digital output function.
Be careful with the polarity of the SPDIF_IO connector.  Check the pin assignment carefully while
you connect the S/PDIF cable, incorrect connection between the cable and connector will make the
device unable to work or even damage it.  For optional S/PDIF cable, please contact your local
dealer.
Pin No. Definition
1 Power
2 No Pin
3 S/PDIF
4 S/PDIFI
5 GND
6 GND
1
2 5
6
14) F_ USB1 / F_USB2 (Front USB Connector)
Be careful with the polarity of the front USB connector.  Check the pin assignment carefully while
you connect the front USB cable, incorrect connection between the cable and connector will make
the device unable to work or even damage it.  For optional front USB cable, please contact your
local dealer.
Pin No. Definition
1 Power (5V)
2 Power (5V)
3 USB DX-
4USB DY-
5 USB DX+
6 USB DY+
7 GND
8 GND
9 No Pin
10 NC
9
2
101 
						

							GA-945GCM(X)-S2 Motherboard - 28 -
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15) COMB (COMB Connector)
Be careful with the polarity of the COMB connector.  Check the pin assignments while you connect
the COMB cable.  Please contact your nearest dealer for optional COMB cable.
Pin No. Definition
1 NDCDB-
2 NSINB
3 NSOUTB
4 NDTRB-
5 GND
6 NDSRB-
7 NRTSB-
8 NCTSB-
9 NRIB-
10 No Pin
109
2 1
Open: Normal
Short: Clear CMOS
16) CLR_CMOS (Clear CMOS)
You may clear the CMOS data to its default values by this header.  To clear CMOS, temporarily
short the two pins.  Default doesnt include the jumper to avoid improper use of this header. 
						

							Hardware Installation - 29 -
English17) CI (Chassis Intrusion, Case Open)
This 2-pin connector allows your system to detect if the chassis cover is removed.  You can
check the Case Opened status in BIOS Setup.
1
Pin No. Definition
1 Signal
2 GND 
						

							GA-945GCM(X)-S2 Motherboard - 30 -
English