Is it worth using a sound card in newer builds?

[ekkuan]

Is it worth using a sound card in newer builds? I noticed that on board sound is alot better than use to be. I have a X-Fi Xtreme Music sound card in my gaming rig on a XFX 780i Mobo. I am in process of building a HTPC and was thinking about using this card since the HTPC mobo doesnt have onboard surround. Just wanted opinions on if onboard sound is good enough for gaming.
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