The Haswell launch gets just a little more complicated each day, with the latest wrinkle being that standard ATX power supplies that conform to the ATX 2.3 standard may not actually be capable of supporting Haswell's extremely low power sleep states. The result has been power supply manufacturers scrambling to see if their power supplies can handle Haswell's requested 0.05A on the 12V rail as opposed to the ATX 2.3 minimum's 0.5A.

Both Corsair and Sea Sonic have been rigorously testing their power supplies to determine which ones definitely can handle Haswell's C6/C7 states, and both have a list of power supplies which are certified to run Haswell, and in the case of Corsair and their substantial portfolio, which power supplies should be able to handle Haswell with no problems.

Starting with Sea Sonic, the following power supplies are certified Haswell ready:

Series Wattages
X Series 650, 750, 850, 1050, 1250
Platinum 660, 760, 860, 1000, 1200
Platinum Fanless 400, 460, 520
G Series 360, 450, 550, 650
M12 II Bronze EVO 750, 850

Corsair is a little bit more complicated. Certification testing is ongoing, but the following power supplies have been guaranteed to be fully compliant with Haswell:

Series Wattages
AXi 760, 860, 1200
AX 650, 750, 760, 850, 860, 1200
HX 650, 750, 850, 1000, 1050
TX-M 650, 750, 850
TX 650, 750, 850
GS (V2) 600, 700, 800
CX 750, 750M

Corsair's validation efforts continue on the following models (predominately legacy), which they say are "likely compatible" but are not confirmed yet:

Series Wattages
HX 520, 620
GS (V1) 500, 600, 700, 800
CX-M 430, 500, 600
CX 430, 500, 600
VX 450, 550
VS 350, 450, 550, 650

If you're looking to make the jump to Haswell next month, the best thing you can do is likely going to be to watch the homepage and support page of your vendor of choice. Haswell will still work just fine with most power supplies, but you may have to disable these lower power sleep states to maintain stability.

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  • cfaalm - Tuesday, May 14, 2013 - link

    How can you tell if your current PSU would be able to deliver Haswell's requested 0.05A on the 12V rail?
  • DanNeely - Tuesday, May 14, 2013 - link

    Starting with nothing connected to the PSU, connect something with a 0.05W load to the 12v rail of the PSU (for older split rail designs, the rail the 12V CPU plug is on), use the paperclip trick to jump the PSU on, and use a multi-meter to measure the 12V being given to your load. ATX spec is +-5% tolerance.

    paperclip trick:
  • cfaalm - Tuesday, May 14, 2013 - link

    Forget that. I just found a nice list that doesn't mention my current PSU.
  • bebimbap - Tuesday, May 14, 2013 - link

    Most companies probably will not test all of their PSUs that have ever been produced. These companies will do a cost/benefit analysis and see which PSUs are still profitable to test. Currently selling models and previous flagship models will probably make the list. Sometimes it's a good idea to pay for the best. Good luck everyone.
  • eBob - Tuesday, May 14, 2013 - link

    The way I would go about this is to use a variable resistor and at least one multimeter (ideally 2). Set up the variable resistor in series with a multimeter set for current between the 12V rail and common. Use a paper clip to turn jump the PSU on. Adjust the variable resistor until you measure 0.05 A (or 50 mA), then read the voltage between the 12V rail and common. If the voltage is above 12.6V (or below 11.4V), then your power supply is not capable of properly delivering the 0.05A. I would guess that most likely the voltage would read high rather than low.
  • xath - Tuesday, May 14, 2013 - link

    PSU manufacturer be quiet! is also confirming through their forum in that their Straight Power, Dark Power, and Pure Power L8 series are Haswell compatible.
  • cmatt85 - Tuesday, May 14, 2013 - link

    For many builders I imagine this will be a non issue. As long as your PSU is single rail, and you have A dedicated GPU, The GPU should pull plenty from the 12V rail to meet the old spec.

    In fact if I had to guess, I think just the motherboard, and a few system fans should raise easily the load to the old ATX spec.
  • cmatt85 - Tuesday, May 14, 2013 - link

    *easily raise
  • Egg - Tuesday, May 14, 2013 - link

    Isn't the whole point deep sleep states? When all those things would be powered down?
  • cmatt85 - Tuesday, May 14, 2013 - link

    No. We already had S1(sleep) The new states, are low power states for the CPU(S0) while the computer is on.

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