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PSU requirement inquiry, can it handle the load?

Discussion in 'General Hardware' started by Sempron Guy, Jan 21, 2014.

  1. Sempron Guy

    Sempron Guy

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    I've been mining coins with my HD7950 lately, and I'm planning to add in two more R9-270s. My specs are as follows:

    Sempron 145 underclocked/undervolted @ 800mhz 1v
    Asus CHV
    Crucial M4
    2 fans
    generic 4GB DDR3 ram
    Corsair CS750M 80+ Gold

    I'm somewhat certain that it can accommodate two more R9-270s. But I just need a second opinion just to be sure. I calculated it quick using an online psu calculator and it totals just around 550w. Now my HD7950 is slightly overclocked to 975mhz from stock 800mhz with a .01 increment on voltage. I'm planning to oc the 270s to 270x speed. Is my psu sufficient? If it is, is it ok to run it at around 80-85% load all the time?
     
  2. Sasqui

    Sasqui

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  3. Sempron Guy

    Sempron Guy

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  4. Sasqui

    Sasqui

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    Ah... 270 peak at 138w here: http://www.techpowerup.com/reviews/ASUS/R9_270_Direct_Cu_II_OC/24.html

    Still, theoretical max at near 500w, not a lot of headroom. Keep your nose tuned into burning smell ;) I once used a 250w dell PSU for a bench build and it ran but man could you smell hot electronics :p
     
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  5. Sempron Guy

    Sempron Guy

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    what's the recommended load for psus? 50%? thanks for the heads up btw :D
     
  6. Blue-Knight

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    70-80%. Full load.

    Happy New Year!
     
  7. TRWOV

    TRWOV

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    50% load will give you the maximum efficiency

    [​IMG]
     
    Crunching for Team TPU
  8. Blue-Knight

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    That's because they didn't test 70%-80%.

    Not sure, just another stupid random opinion.
     
  9. ZetZet

    ZetZet

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