The Pain
Discoverer
A good 650W PSU for 4k is a joke. Check this list for something good : http://www.techenclave.com/community/buyers-guide/best-power-supply-units/
Haswell compatibility is a new marketing gimmick. Practical reality discussed here.
Great Links Thanks . Hadnt seen them before.
Would still vouch for the Corsair VS650 though. Working flawlessly powering a Maximus V Gene, Core I7 2600K, 16GB of Gskill ram, Zotac GTX 680, 1 SSD, 1 TB, 1 500GB, DVD drive, Corsair H100i and a Asus Xonar Essence STX without any issues for over 10 months.