Seasonic has posted a list of Intel Haswell compatible PSUs



From KitGuru:

With Intel’s new Haswell platform just around the corner, many power supply companies have been rushing to get compatibility confirmed.

You may not know, but Intel’s Haswell C6/C7 power states require a minimum load of 0.05A on the 12V2 rail and many current power supplies will fail to provide that low a current. Many older power supply designs comply with ATX 12V V2.3 design guidelines meaning they only call for load of 0.5A on the CPU power rail. This will mean C6 and C7 power states will be disabled in the bios.

Although we have yet to test, there may be cases that the supplies will become unstable when the processors try to enter into these states. Additionally the problems get worse when we factor in that many power supply units do not report minimum currents supported by the 12V2 rail.

  Will your power supply work with Haswell? Seasonic announce compatible units