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Thread: Report: Not all PSUs support Haswell's low-power states

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    I was referring to Pearce's comment as he tends to be pretty accurate on such things. It seems like something ASUS and GB would do anyway, ASUS' first UEFI board already has the option to explicitly disable C5/C6 states.

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    Enermax press release on Haswell:
    http://www.enermax.co.uk/news/?tx_tt...c4637fc86de0b4

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    Quote Originally Posted by Enermax
    All current high-end and mid-range models from Enermax are already prepared for the upcoming Intel® processors.
    Interesting.... so that would imply budget models, which are most likely will also be lower wattage models may not be compatible.

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    Thing is... even your group regulated PSU's can handle 0 or 0.05A load on the +12V. The issue is what the load is on the +3.3V and +5V. I've taken a CX600 and put as much as 5.6A on the +3.3V and 5.6A on the +5V while having no long on the +12V and had the voltages stay in spec. Any more than that and the voltage go out of spec.

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    Corsair released some more details: http://techreport.com/news/24797/cor...mpatible-units

    Looks like any PSU that uses DC-to-DC for the non-primary rails will automatically be fine. Only Corsair's budget CX and VS lines don't have this apparently, and are currently undergoing testing.

  6. #16
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    Corsair PSU-
    Question if I may jump in here.

    Will we be seeing re-designed PSU's for Haswell or possibly wiring redesigns for the Haswell mobo? The reason I ask is I am putting together and gathering Haswell components now. I think the Corsair AX860i would be a good fit and they have their sleeved cables at half price. Would I be safe to get this PSU for an ASUS Deluxe Haswell mobo?
    Dave

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    No, it will not work. As a matter of fact, no PSU will ever work with Haswell. Don't buy anything, and you'll be just fine!


    Jesus Fucking Christ, this Haswell panic is getting really old, really fast.
    Careful what you wish for... You just might get it.

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    So, lemme get this straight. The only PSUs that might theoretically have problems with C7 state are either:
    - group regulated designs that don't handle crossload properly;
    - equipped with no-load protection not working properly;
    And even then, the probability of such PSUs being incompatible with C7 is second to none?

    Seeing as Enermax and Corsair promptly announced that all of their current DC-DC PSUs are compatible with C7 state, I assume that this issue even in theory wouldn't affect DC-DC and indy regulated PSUs, yup?

    I'm not panicking, it's just that there's a grain of truth in everything :P
    Xeon X3440 @3,1GHz + GTX660 + 2x4GB @1650MHz CL9 + Corsair RM650

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    Quote Originally Posted by yojo2 View Post
    So, lemme get this straight. The only PSUs that might theoretically have problems with C7 state are either:
    - group regulated designs that don't handle crossload properly;
    - equipped with no-load protection not working properly;
    And even then, the probability of such PSUs being incompatible with C7 is second to none?

    Seeing as Enermax and Corsair promptly announced that all of their current DC-DC PSUs are compatible with C7 state, I assume that this issue even in theory wouldn't affect DC-DC and indy regulated PSUs, yup?

    I'm not panicking, it's just that there's a grain of truth in everything :P
    Get that grain under your tongue, and in a few years you have a pearl. ;-)
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    The only real possibility of an error stems from the very remote chance that a PSU doesn't have any minimum load resistors in it, and having an unloaded 12V rail makes it's regulation go bonkers, thus provoking a safety shutdown because of an overvoltage on 12V or undervoltage on 5V rail. I think you'd be really hard-pressed to find such a PSU, only to conclude that it's a < $20 bargain bin trash.

    Everyone please stop hyping up this non-issue, it is just so incredibly irrelevant!
    Careful what you wish for... You just might get it.

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