Realtek audio chips are pretty popular and used on all kinds of motherboards. Unfortunately Realtek hardly ever includes a changelog, so we'll have to go with "latest, bug fixes, and possible performance improvements." Download them here.
It's been over a year since Realtek updated its HD Audio Codec drivers and considering these audio chips are very popular on desktop and laptop OEM systems we felt compelled to give them a mention. Release notes don't offer much details on what's new though you can expect better compatibility across the board. As usual you can head to our drivers section for this and more timely updates.