Sorry to say it, but you're not getting your money's worth out of a Crossfire setup due to hardware/driver issues on AMD's side. Your frame rate is artificially high because it counts dropped & partial frames that really don't add anything to the actual 'experienced' frame rate. Multi-card setups from AMD are a waste of money right now, until AMD gets drivers out that try to correct the issue. If you want a really in-depth explanation of what's going on from a technical standpoint, read this:
Frame Rating Dissected: Full Details on Capture-based Graphics Performance Testing | PC Perspective
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