I just ordered this board (Realtek® ALC892 8-Channel High Definition Audio CODEC) for my new build. The computer is my primary system for playing music, so I want something that sounds at least as good as the Sound Blaster Live card on my 10 year old system.
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What are you using for speakers?
Probably the best option is to give the onboard sound a good 'road test' and see how you feel about the audio quality.