With the 6950 the DVI, DVI-D and HDMI ports all share the same bandwidth, so you can only use two of them at a time, if you want to use a 3rd you need to use an active dp-dvi adaptor, which you can pickup for under £20, the best solution is to use both display ports as they are independent channels.
http://www.scan.co.uk/products/xfx-active-mini-dp-to-single-link-dvi-dongle-retail-boxed
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My Multi-Monitor Focused YouTube Channel:
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http://www.twitch.tv/SkidInc"Imagination is the only weapon in the war against reality."