ASROCK 770 Extreme3 Manual Del Usuario página 19

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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. 3)
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.
Serial port Header
(9-pin COM1)
(see p.2 No.28)
HDMI_SPDIF Header
(3-pin HDMI_SPDIF1)
(see p.2 No. 31)
ASRock
20-Pin ATX Power Supply Installation
Please connect an ATX 12V
4 8
power supply to this connector.
1 6
4-Pin ATX 12V Power Supply Installation
This COM1 header supports a
serial port module.
HDMI_SPDIF header, providing
SPDIF audio output to HDMI VGA
card, allows the system to
con nect HDMI Digital TV/
projector/LCD devices. Please
connect the HDMI_SPDIF
connector of HDMI VGA card to
this header.
770 Extreme3 Motherboard
24
12
13
1
4 8
1 6
1 9 1 9 1 9 1 9 1 9