With the rise of onboard audio, the technical details that used to come with your sound card are often missing from your motherboard manual.  Hardware Secrets has compiled a set of tables that will help you sort out the mysterious chip found on your motherboard.  Covering Analog Devices, C-Media, Realtek, VIA and other manufacturers they list the major chips available and an overview of their capabilities.  Bookmark this one if you find yourself tracking down audio chip specifications frequently.

"Audio codec is a small chip measuring 0.25 sq. in. (7 mm2) located on the motherboard in charge of the analog audio functions. Knowing the specs of a codec will permit you to compare the audio quality of different motherboards, allowing you to choose the right product for your needs."

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Audio Corner