Assuming your Mobbo also supports X-fire. I haven't checked, but I hope you have!
Although it does depend on what headphones you have. If they are simple stereo headphones (however good quality), jabarto's right - onboard is good enough. You'd only need to bother with a dedicated card if you had some really fancy surround sound headphones. If you have Logitech G35's, then there's no need at all for a sound card as they use their own software driver.
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