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