Would be Able to Power a Rig with 3 x Zotac GTX 1080 Extreme Amp Edition
I am having the issue where the PSU is Clicking and then after a while PC powers off.
I think it might be overloading, Is that Possible?
According to here, each one of those cards pulls 280W, so all three will pull 840W. With your 850W supply, I’d say you are definitely overloading it. Personally, I always give myself 100W of headway with any build (mining or otherwise.)
Edit: Don’t forget to factor in other power uses of the rig such as risers, fans, etc.