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I'd grab a couple of these - http://www.overclockers.co.uk/showproduct.php?prodid=GX-097-GI&groupid=701&catid=56&subcat=938
For the screens, if you want thin - http://www.overclockers.co.uk/showproduct.php?prodid=MO-165-SA&groupid=17&catid=1120&subcat=
or 6970 crossfire to save abit of money?
maybe twin frzor ii 6970's? or spend the extra £200 for another 10fps?
Yep, got a tax rebatenot sure about the 200+ for another 10fps tho :/ dose the 7970 have any advantages over the 6970 for eyefinity?
Yeah the vram will, especially with 3 27" monitors, whats the heat and noise like on the refrence 7970's? Will my mobo bottleneck the 7970's and i have a 750w psu, will i need to upfrade that aswell?

7970's can be had here for £300 on special, they can be up to 40% faster than a 6970 so 2 of them would be 80% faster. The 3gb of VRAM is a big help aswell.
Im using a 23" currently and sit close to it and wish for abit more, im also planning on buildingy own largecorner desk so all three monitors will fit together nice, whats the most common size for eyefinity?
If a 7970 was 40% faster than a 6970 then two 7970s would still only be 40% faster than two 6970s assuming the CrossFire scaling was the same.
You need a better wallpaper that goes across all three.

Yeah ill deffo have the room, will my mobo bottleneck the cards at x8 bandwidth? Using a single card it runs at x16 just halfs it
