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Need help with choosing new PSU

Hello, i want to upgrade to gtx770 and upgrade PSU with it, i got now 520W PSU (Seasonic M12II-520 Bronze), i want to get new, 600W+ because i want to upgrade to i7 K series in future. Is it worth to buy 750W now? Or i dont need 750W to i7 K + GTX770?? I will get only gtx770 with new PSU so i7 maybe next year, i got i5 3450, 8gb Corsair Vengeance 1600MHz.

I was thinking about Seasonic M12II-750 80Plus Bronze 750W and FSP Group RAIDER 750W

Thanks for answers and also sorry for my english. :)
8 answers Last reply Best Answer
More about choosing psu
  1. go with a seasonic or corsair and you dont need a 750watt
  2. rosewill and coolermaster are good too
  3. your current PSU is fine. As long as you don't add a second GPU. You will even be able to get some overclocking in with the current PSU.
  4. PsyKhiqZero said:
    your current PSU is fine. As long as you don't add a second GPU. You will even be able to get some overclocking in with the current PSU.


    Seconded. Your PSU probably gives about 600w. (Good PSU manufacturers underestimate the power output.)
  5. ZavProD said:
    Hello, i want to upgrade to gtx770 and upgrade PSU with it, i got now 520W PSU (Seasonic M12II-520 Bronze), i want to get new, 600W+ because i want to upgrade to i7 K series in future. Is it worth to buy 750W now? Or i dont need 750W to i7 K + GTX770?? I will get only gtx770 with new PSU so i7 maybe next year, i got i5 3450, 8gb Corsair Vengeance 1600MHz.

    I was thinking about Seasonic M12II-750 80Plus Bronze 750W and FSP Group RAIDER 750W

    Thanks for answers and also sorry for my english. :)


    Hi - actually your 520w unit is cutting it too close. 575 - 600w units are recommended for
    a system with a gtx 770. But, the real issue is the amps avail on the +12v rail(s), 42 +12v
    amps are recommended, and the S12 - 520 has 40. You most likely would OC
    as well. You need more +12v rail amps! than you have.

    You don't need a 750w unit, a quality 650 will give plenty of headroom.
  6. Best answer
    http://www.legitreviews.com/article/2201/12/

    Above is a chart showing the power consumption for a GTX 780. Now keep in mind that this is taken from the wall. Assuming 80 percent efficiency then the power draw is closer to 320 watts from the power supply. At least that how I understand it.

    The current I in amps (A) is equal to the power P in watts (W), divided by the voltage V in volts (V):
    I(A) = P(W) / V(V)

    So even if you use the power measurement from the wall he REALLY only needs 33 amps on the 12v. His PSU is more then enough.

    I think GPU manufactures really overestimate the power requirements to account for crappy PSUs and VERY loaded systems.
  7. Yep, 750 would probably be overkill, unless you start OCing. This would work really well.
    Seasonic S12II-620 620W ATX12V Standard Power Supply Unit - Bronze
    http://www.amazon.co.uk/dp/B003BIEOCI/?tag=pcp0f-21

    5 year warranty, very well made, plenty of power (48amps on 12V).
  8. PsyKhiqZero said:
    http://www.legitreviews.com/article/2201/12/

    Above is a chart showing the power consumption for a GTX 780. Now keep in mind that this is taken from the wall. Assuming 80 percent efficiency then the power draw is closer to 320 watts from the power supply. At least that how I understand it.

    The current I in amps (A) is equal to the power P in watts (W), divided by the voltage V in volts (V):
    I(A) = P(W) / V(V)

    So even if you use the power measurement from the wall he REALLY only needs 33 amps on the 12v. His PSU is more then enough.

    I think GPU manufactures really overestimate the power requirements to account for crappy PSUs and VERY loaded systems.


    nvidia recommends a 600w PSU - minimum

    This is realhardtechx expertise -
    http://www.realhardtechx.com/index_archivos/Page362.htm

    Please read the the comments before the #'s on this
    http://forum-en.msi.com/faq/article/power-requirements-for-graphics-cards
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