ASRock Z77 Extreme6 User Manual - Page 44
SLI/XFIRE Power Connector
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SLI/XFIRE Power Connector (4-pin SLI/XFIRE_PWR1) (see p.14 No. 3) 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 (9-pin FRONT_1394) (see p.14 No. 31) 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. Serial port Header (9-pin COM1) (see p.14, No. 34) This COM1 header supports a serial port module. HDMI_SPDIF Header (2-pin HDMI_SPDIF1) (see p.14, No. 36 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. 44