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Is my PSU powerful enough for a 290x Crossfire?

I currently have a Sapphire Vapor-X R9 290x 8G installed in my computer. I've been wanting to set up a crossfire for some time now and have finally found the same card, used, for a decent price. I am afraid, however that I don't have a strong enough PSU for the job.

Right now, I'm using a Corsair HX750 Gold to support an i7 4790 CPU, five cooling fans (including the generic CPU fan), two internal HDDs, a CD-ROM, and the GPU. If I try and add another Sapphire 290x, would I be overworking it?
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  1. Best answer
    750W is not enough for two R9 290Xs. You can get away with a quality 850W, but if you want to be on the best place on the efficiency curve you want a quality 1000W.
  2. CRA01 said:
    I currently have a Sapphire Vapor-X R9 290x 8G installed in my computer. I've been wanting to set up a crossfire for some time now and have finally found the same card, used, for a decent price. I am afraid, however that I don't have a strong enough PSU for the job.

    Right now, I'm using a Corsair HX750 Gold to support an i7 4790 CPU, five cooling fans (including the generic CPU fan), two internal HDDs, a CD-ROM, and the GPU. If I try and add another Sapphire 290x, would I be overworking it?


    you need minimum 850w if you are not going to overclock anything

    1000w or better is recommended
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