ASROCK X79 Extreme4-M User Manual page 36

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.12 No. 1)
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.12 No. 39)
IEEE 1394 Header
(9-pin FRONT_1394)
(see p.12 No. 32)
Serial port Header
(9-pin COM1)
(see p.12 No. 31)
20-Pin ATX Power Supply Installation
Please connect an ATX 12V
5 1
power supply to this connector.
8 4
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 graphics
SLI/XFIRE_POWER1
cards are plugged to this
motherboard.
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.
36
12 24
1 13
5 1
8 4