ASROCK P55 Extreme User Manual page 35

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. 2)
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.12 No. 25)
Serial port Header
(9-pin COM1)
(see p.12 No.29)
HDMI_SPDIF Header
(3-pin HDMI_SPDIF1)
(see p.12 No. 30)
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
RXTPAM_0
GND
port on the I/O panel, there is one
RXTPBM_0
+12V
IEEE 1394 header
GND
(FRONT_1394) on this
1
+12V
motherboard. This IEEE 1394
RXTPBP_0
GND
header can support one IEEE
RXTPAP_0
1394 port.
RRXD1
This COM1 header supports a
DDTR#1
DDSR#1
serial port module.
CCTS#1
1
RRI#1
RRTS#1
GND
TTXD1
DDCD#1
HDMI_SPDIF header, providing
1
SPDIF audio output to HDMI VGA
GND
card, allows the system to
SPDIFOUT
+5V
connect HDMI Digital TV/
projector/LCD devices. Please
connect the HDMI_SPDIF
connector of HDMI VGA card to
this header.
3 5 3 5 3 5
3 5 3 5
12 24
1 13
8 5
4 1