The Seasonic X-560 brings modular cabling to a lower power PSU, whereas we used to only see it on high powered PSUs.  At 560W it is probably a little on the low end for a GTX580 (or 480 for that matter) but for systems that are using mid-ranged GPUs it offers plenty of power.  It will set you back $130 to pick up one of these PSUs but as you can see from the review at [H]ard|OCP the quality provided makes that price a rather good deal.

“The first fully modular PSU we have seen from Seasonic aimed the low end in terms of enthusiast’s PCs. Seasonic does however move on with a very specialized DC to DC way of conversion that is not seen in other PSUs. Can it stand up to our punishment?”

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