Do I need a higher wattage psu?

Discussion in 'General Hardware' started by ATR, Aug 27, 2011.

  1. ATR

    ATR Member Guru

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    Graphics Card::
    amd 7850 CF
    I am looking to get another amd 6870 so I can crossfire, and was just wondering if I needed a higher wattage psu.

    Current system:

    PSU: Corsair HX750
    Motherboard: Gigabyte x58A-UD3R
    CPU: Intel Core i7 930
    CPU Cooler: Coolermaster V8
    GFX Card: Reference amd 6870.
    Memory: 6GB (3x2GB) 1600MHz DDR3 Corsair Dominator 8,8,8,24
    HDD's: 3 - 1 SSD, 2xSATA2 HDDs
    Optical Drive's: 2 - 1 BD writer, 1 BD read
    PCIe Wireless card (PCIe x1 or x4 i don't know)

    I have tried using the extreme psu calculator, that spits out 600 which seems too low, I tried ASUS's and that spit out 1050 which is far too high, the guru review says 700, which seems closer to the figure. Anyone running 2 6870s? what psu do you use? anyone know if my 750 is enough?
     
  2. PhazeDelta1

    PhazeDelta1 Moderator Staff Member

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    EVGA 1080 FTW
    corsair tends to underrate the wattage on their psu's. so its a little higher than 750w. youll be fine with what you got
     
  3. Trolle

    Trolle Maha Guru

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    KFA2 1070 sniper
    indeed you'l be fine
     
  4. Brendruis

    Brendruis Maha Guru

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    Reference GTX 680 SLI
    its fine my quite similar hx850 run 580 sli no probs not even approaching efficiency threshold
     

  5. ATR

    ATR Member Guru

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    amd 7850 CF
    Thxs

    yeah, i just wanted to make sure because with my last PC, I bought the 5770 and I thought the 500W i was running at the time would be good enough, but within 3 hours of gaming the card screwed up(maybe it was just the card faulty i don't know). So i'm cautions not to put too much stress on the PSU - but that was a lower model antec psu, the Corsair is far superior and I have read that the corsair PSU's (well at least the HX and TX series have been able to pushed over the stated Wattage a bit.
     
  6. Anfield82

    Anfield82 Maha Guru

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    MSI 7970
    Corsair have a high price tag for a reason. It's time like this when you realize how important buying a decent PSU is. I had a crap one before (regret) but quickly changed it for Corsair when I wanted to go SLI. The crap one had a higher wattage but I knew it would probably destroy my system one day lol.

    Now I always buy a decent PSU. This time it's a Be Quiet! one.
     
  7. eclap

    eclap Banned

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    Palit GR 1080 2000/11000
    you'll be absolutely fine with that rig and that psu, even with 2x 6870.
     
  8. BarryB

    BarryB Maha Guru

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    Graphics Card::
    Palit SJS 780 in SLI
    If your case has room use 2 PSU's, one for the mobo, drives etc and one just for the GPU :)
     
  9. CoreyPL

    CoreyPL Master Guru

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    MSI Gaming GTX780 3GB
    He really doesn't need to do it. He doesn't run Quad CF or SLI or Dual CPU etc.
    One 750W is more than enough for 6870 in CF.
     
    Last edited: Aug 27, 2011
  10. Trolle

    Trolle Maha Guru

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    KFA2 1070 sniper
    and the point of that is?
     

  11. jaydeee

    jaydeee Active Member

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    My idea is "better be higher than shorter" :)
     
  12. raif

    raif Master Guru

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    MSI Twin Frozr GTX 980
    i can run dual 580's on my 850w psu, youll be fine with 2 6870's
     
  13. BarryB

    BarryB Maha Guru

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    Palit SJS 780 in SLI
    Split the load, one for your system and one for the GPU or GPUs, then if one blows up it either takes out your GPU's or just your mobo/drives :banana:
     
  14. lehtv

    lehtv Ancient Guru

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    If one blows up. Why not just buy insurance? Much cheaper than buying another PSU.
     
  15. ---TK---

    ---TK--- Ancient Guru

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    2x 980Ti Gaming 1430/7296
    no,no,no that psu is more than enough for 2 6870s
     

  16. Elysianarcane

    Elysianarcane Banned

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    Graphics Card::
    Radeon HD 6620G 512MB
    a 650W is fine for 6870 CFX.
     
  17. Jcazz

    Jcazz Master Guru

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    Graphics Card::
    Tri-fire 5870
    keep some watts available for longevity. 650 watts for crossfire is low. i would not go any less than 750watt psu. and check amps on the 12v rail as this is the more important story. Its always good to have a buffer...

    Is redlining your car good?
     
  18. maleficarus™

    maleficarus™ Banned

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    Graphics Card::
    ASUS GTX460 800/1600/4000
    Two different calculators would never give out a 400+ watt difference. You obviously typed in wrong information, that or different information for each calculator. Use the same info and it should be within 100 watts of eachother on both...
     
  19. maleficarus™

    maleficarus™ Banned

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    You can't be serious...

    Man the Popwer supply marketing teams really loves guys like you!!
     

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