If I plan on using a Radeon 4890 for a HTPC that will be used for playing movies, as well as a gaming rig, do I really need a separate sound card since the Radeon has HDMI 7.1 audio output? Will this be good for gaming, or should I have audio being handled by a separate card from say Creative or Asus?
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Your motherboard doesn't have an onboard sound card? If u have it then it's alright to use it, u won't hear big different from it.