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

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    Quote Originally Posted by McSteel View Post
    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!
    Actually, a lot of group regulated units today don't have any kind of minimum load resistors in them because they drop the efficiency of the unit. I have a CX600 here, and if I put more than 5.4A on each of the +3.3V and +5V, the +12V jumps up to 12.61V. The greater the load on the +3.3V and +5V, the higher the +12V goes.

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    OVP won't trip below ~13.2V in most cases. Also, a 5+A load on the 5V rail is unlikely in a deep sleep. It's even less likely on the 3V3 rail.

    Non. Issue.
    Careful what you wish for... You just might get it.

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    OVP won't trip below ~13.2V in most cases.
    Not optimal for CPU life ?

    I don't think it is horrible to warn people to use a decent PSU for their new rig.

    It always amazes me the obsolete equipment people will carry over...

    "hey, my creative sounblaster card still works great..." Well, you know the MB has built in sound that is like 10x better than that..."I don't know, the sound on my 10 year old MB really sucked, you really need a discrete card, so I'll keep using this 10 year old model..."

    Over the years, I have seen the worst results in mismatched chip-sets and CPU.

    Sure your old MB will run the new CPU...just not very well...

    So, letting people know that to get the best results from their new cpu, they should have a moderately modern PSU makes sense to me.


    http://techreport.com/news/24797/cor...mpatible-units

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    The point of the statement you quoted wasn't that it's ok to have > 12.6V going to the MoBo VRM, it's that the PSU won't shut off as soon as it starts outputting 12.61V. And even if it did, that would mean going from a deep sleep (hibernation, for all intents and purposes) to full-off. For me personally, there is practically no distinction between the two.
    Careful what you wish for... You just might get it.

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    Well, as usual, you know a great deal more than I.

    But hey, we do want to sell more{quality} PSU...right?

    Edit: for those that don't know...I have no ties to the industry...Just an enthusiast that likes quality kit.

    Just saying, anything that convinces people not to buy $20 POS is alright in my book. (adopts the Clinton/Machiavellian values)
    Last edited by mdk777; 05-12-2013 at 02:04 PM.

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    Quote Originally Posted by McSteel View Post
    Also, a 5+A load on the 5V rail is unlikely in a deep sleep.
    Absolutely. VERY unlikely. And therefore any PSU should work. The problem is Intel's testing methodology for Haswell compatibility. They're putting 0.05A on the +12V and the maximum on the +3.3V and +5V.

    So it's not a problem for the educated consumer. The problem is going to be for those that look to Intel for an answer. Just like back in the day when people looked for an SLI logo on the box to determine if a PSU is what they should get for their SLI rig.

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    Only way I can think of is charging an awful lot of USB devices.

    It sounds like Intel wants everything to go DC-DC to me.

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    It'd be fine by me if Intel started pushing towards companies actually following the ATX spec.

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    Quote Originally Posted by Kougar View Post
    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.
    I've read something similar @ Anandtech and I have a question. The list there shows TX 650/750w, HX 750/850w, etc... By this do they mean the current ones? Discontinued and current ones? ...

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    Check the list at Corsair's site. Not Anandtech's site. Which one is going to be newer?

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