You will need active display ports to get eyefinity working, I'm assuming the 6870 has the same limitations as the 6970, in which case you can only use two of the DVI and HDMI connections at a time, so you will need at least one active display port adaptor, that said you can pick up cheap ones for £20, like this one: http://www.scan.co.uk/products/xfx-active-mini-dp-to-single-link-dvi-dongle-retail-boxed
Typically the normal configuration is two DP to DVI, one DVI, then you can use the HDMI or second DVI to a 4th monitor or TV.
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