PSU failures frequently take out other components. I would much rather spend an extra $100 on a PSU that is bigger/better than necessary, than have to replace other more expensive components. The machine I am typing this on has a 7 year old Corsair AX850 in it (the rest of the components have been upgraded more than once). Currently it is running an 17-3820, 16GB, Zotac GTX1080 Amp Extreme. I will still be using that PSU when I install a new mobo/cpu/memory combo this summer.