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then i would go for the 2011... but please forget the 580. the 670 will be out soon and it will outperform the 580 by a margin if the 680 benches are anything to go by, and cost about 50 quid less if nvidia continue there price war with amd...
the advantages of the 2011 socket cpu are more memory bandwidth and the extra pci-e lanes that dont need to be split to run 2 cards...

if your only gonna have 1 gfx card then you may as well save some cash and get the 2600k. but if your going for a high end rendering system then the 2011 will show a slight advantage... is it worth the cost across the whole build? it depends. for gaming no. but productivity should see a performance gain from the newer socket and layout...
in the synthetics you will see both cpu's trade blows on each test. the 1155 besting on some while the 2011 besting on others...
but like i say there will be a bigger margin the more gfx cards you add.
 

CapperDom

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Feb 24, 2012
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I was thinking of adding two GTX 580's.