Most power supplies won't support Haswell's C6/C7 low-power states

[kemosabe]

It has been discovered that a number of power supplies currently on the market don’t support Haswell’s C6/C7 low-power states due to the fact they are unable to deliver less than 0.05 amps across the 12V2 rail according to a report from VR-Zone. Haswell’s C6/C7 states requires a minimum load of 0.05 amps on the 12V2 line. Power supplies that are older or budget models simply aren’t capable of delivering such a small amount of juice. As a result, users with incompatible power supplies may experience stability problems or worse, the system may shut down completely if the PSU’s under- or over-voltage protection kicks in.

 

http://www.techspot.com/news/52423-most-power-supplies-wont-support-haswells-c6-c7-low-power-states.html

[SRINI87]

Wtf

[Razpor]

This is messed up.but expected,with power requirements going lower and lower by day ,this was expected sooner than later.

[Zod]

WTF.....

[ALPHA17]

WTF.....

 

Alright further expanding on this, unless you don't put your PC into Sleep state often, it should function fine with current generation SMPS.

 

Also Haswell further delayed due to USB 3.0 bug, for more on topic, head here.

[ALPHA17]

Corsair and Seasonic take out list of SMPS's that support the Haswell's extreme power-saver sleep mode

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

 

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