ASROCK A770CrossFire Manual Del Usuario página 26

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.
SLI/XFIRE Power Connector
(4-pin SLI/XFIRE_PWR1)
(see p.2 No. 37)
Serial port Header
(9-pin COM1)
(see p.2 No.26)
HDMI_SPDIF Header
(3-pin HDMI_SPDIF1)
(see p.2 No. 30)
2 6 2 6 2 6
2 6 2 6
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
It is not necessary to use this
connector, but please
connect it with a hard disk
power connecor when two
SLI/XFIRE_POWER1
graphics cards are plugged
to this motherboard at the
same time.
This COM1 header supports a
serial port module.
HDMI_SPDIF header, providing
SPDIF audio output to HDMI VGA
card, allows the system to
connect HDMI Digital TV/
projector/LCD devices. Please
connect the HDMI_SPDIF
connector of HDMI VGA card to
this header.
A770CrossFire Motherboard
13 1
24 12
4 8
1 6