ASRock Z77 Extreme6/TB4 manual Port on the I/O panel, there is, One Ieee 1394 header on this

SLI/XFIRE Power Connector

(4-pin SLI/XFIRE_PWR1)

(see p.2 No. 40)

SLI/XFIRE_POWER1

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.

IEEE 1394 Header	Besides one default IEEE 1394
(9-pin FRONT_1394)	port on the I/O panel, there is
(see p.2 No. 19)	one IEEE 1394 header on this
	motherboard. This IEEE 1394
	header can support one IEEE
	1394 port.
Serial port Header	This COM1 header supports a
(9-pin COM1)	serial port module.
(see p.2, No. 31)

HDMI_SPDIF Header	HDMI_SPDIF header, providing
(2-pin HDMI_SPDIF1)	SPDIF audio output to HDMI
(see p.2, No. 33)	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.

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ASRock Z77 Extreme6/TB4 Motherboard