Answer
A780GM-A is built with AMD 780G chipset, integrated DVI or HDMI interface (passing HDMI CTS v1.3b): single-link support only for HDMI, 30-bit dual-link support for DVI.
HDMI 1.3
Prior to Version 1.3, HDMI supported a clock rate of 165MHz or 4.95 Gbps, transferring 165 million 24-bit pixels per second. Introduced in 2006, HDMI 1.3 increased the rate to 340MHz (10.2 Gbps) to accommodate 2560x1440 HDTV resolution with pixels up to 48 bits, known as "deep color." HDMI also supports eight channels of 24-bit uncompressed audio at 192kHz.
HDMI 1.3 uses two types of cables. HDMI Category 1 cables are rated for 720p and 1080i TVs. For higher resolutions, HDMI Category 2 cables are required. See HDTV.
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