ASROCK H55 Extreme3 Manual De Instrucciones página 21

Though this motherboard provides 4-Pin CPU fan (Quiet Fan) support, the 3-Pin
CPU fan still can work successfully even without the fan speed control function.
If you plan to connect the 3-Pin CPU fan to the CPU fan connector on this
motherboard, please connect it to Pin 1-3.
ATX Power Connector
(24-pin ATXPWR1)
(see p.2, No. 8)
Though this motherboard provides 24-pin ATX power connector,
it can still work if you adopt a traditional 20-pin ATX power supply.
To use the 20-pin ATX power supply, please plug your
power supply along with Pin 1 and Pin 13.
ATX 12V Power Connector
(8-pin ATX12V1)
(see p.2 No. 4)
Though this motherboard provides 8-pin ATX 12V power connector, it can still work
if you adopt a traditional 4-pin ATX 12V power supply. To use the 4-pin ATX power
supply, please plug your power supply along with Pin 1 and Pin 5.
IEEE 1394 Header
(9-pin FRONT_1394)
(see p.2 No. 33)
Serial port Header
(9-pin COM1)
(see p.2 No.30)
ASRock H55 Extreme3 Motherboard
Pin 1-3 Connected
3-Pin Fan Installation
12 24
Please connect an ATX power
supply to this connector.
1 13
20-Pin ATX Power Supply Installation
Please connect an ATX 12V
8 5
power supply to this connector.
4 1
4-Pin ATX 12V Power Supply Installation
Besides one default IEEE 1394
port on the I/O panel, there is one
IEEE 1394 header
(FRONT_1394) on this
motherboard. This IEEE 1394
header can support one IEEE
1394 port.
This COM1 header supports a
serial port module.
12 24
1 13
8 5
4 1
2 1 2 1
2 1 2 1 2 1