HDMI audio HD24/600...:"ATI Avivo™ HD Video & Media
Combine advanced HD video processing with cool, quiet, and energy efficient operation that will delight a home theater enthusiast. ATI Avivo™ HD technology provides hardware based H.264/VC-1 decoding of Blu-ray and HD DVD movies and *built-in 5.1 surround audio designed for an easy HDMI connection to big-screen TVs."(http://ati.amd.com/products/radeonhd2400/index.html)
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