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S12II 520w power supply - Haswell

I had a S12II 520w that was only a few months old and figured I'd throw it in a new build for a family member.

ASRock H87M Pro4 LGA1150
GSKILL Ares series 2x4gb 240pin DDR3
Western Digital 500gb 7200rpm Black
Intel Pentium G3220

I purchased all the parts and was planning on using the power supply, however I have found out that Haswell has low power states that need a certified power supply. I have read on a few sites that this is not necessary and can be disabled in the bios and is default disabled on most motherboards.
I was wanting to find out if this is true and I'm safe to hook up this 520W Seasonic without fear of damage to these components?

Buying a new power supply will delay the build 5 days and I'd like to avoid buying a new one if possible, however I'd rather not lose components to power.
5 answers Last reply Best Answer
More about s12ii 520w power supply haswell
  1. without a gpu in the system you could put as low as a 300 watt psu in there without any worries.


    that being said, a typical 520watt seasonic will be able to power even some of the higher end video cards and has a great reputation for being a high quality psu. the low power state of a haswell certified psu might save you less than a dollar per year. you do not NEED a haswell power supply to run a haswell cpu, all the haswell rated psu would do is allow for those low power states to run, otherwise it will just run normally on any other psu
  2. Brantyn Gerik said:
    without a gpu in the system you could put as low as a 300 watt psu in there without any worries.


    that being said, a typical 520watt seasonic will be able to power even some of the higher end video cards and has a great reputation for being a high quality psu. the low power state of a haswell certified psu might save you less than a dollar per year. you do not NEED a haswell power supply to run a haswell cpu, all the haswell rated psu would do is allow for those low power states to run, otherwise it will just run normally on any other psu


    So there is no danger in running this system off a 520w seasonic? I have read articles about the computer cutting off when trying to enter those states with a non-certified PSU, and was worried about possible damage. I have no care in the world for the lower power state, and was just worried if it will cause a problem if the chip tries to enter that state with a non-certified PSU.

    His PC is for flash games, email, internet, youtube, word documents.... He is worried about April 8th and the discontinuation of XP.
  3. Best answer
    absolutely no problem with a non haswell certified psu whatsoever, and if there was a problem, it would be considered due to a faulty psu rather than an incompatibility

    as far as the discontinuation of xp, tell him to upgrade to windows 7 then
  4. VJTB said:
    So there is no danger in running this system off a 520w seasonic? I have read articles about the computer cutting off when trying to enter those states with a non-certified PSU, and was worried about possible damage. I have no care in the world for the lower power state, and was just worried if it will cause a problem if the chip tries to enter that state with a non-certified PSU.

    His PC is for flash games, email, internet, youtube, word documents.... He is worried about April 8th and the discontinuation of XP.


    If you're re-using the Seasonic S12II-520 Bronze just make sure that C6/C7 support in BIOS is disabled (i.e. don't assume that it's disabled by default. That may have been the default setting a year ago but not necessarily the case now.)

    The Seasonic S12II-520 Bronze is based on the old group regulated circuit design and can become unbalanced (i.e. one of the rail voltages will go out of spec) when the CPU enters C6 or C7 sleep state causing one of the PSU's protection circuits to kick in. The system won't wake up when this happens and you will then need to cycle the PSU's AC power switch to get the PSU to reset itself.
  5. Wish I could split the points, however it only allows one. I'll look up where to disable the bios power states and make sure it is off too. Thank you both.
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