ASROCK Z77 Extreme6 User Manual page 44

SLI/XFIRE Power Connector
(4-pin SLI/XFIRE_PWR1)
(see p.14 No. 3)
IEEE 1394 Header
(9-pin FRONT_1394)
(see p.14 No. 31)
Serial port Header
(9-pin COM1)
(see p.14, No. 34)
HDMI_SPDIF Header
(2-pin HDMI_SPDIF1)
(see p.14, No. 36)
SLI/XFIRE_POWER1
44
It is not necessary to use this
connector, but please connect it
with a hard disk power
connecor when two graphics
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.
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.