I have a 530w Be Quiet L7 PSU which has provided the power to run my current computer and CPU ( Phenom 11 x4 955 BE @125W) flawlessly. I intend to add temporarily a GTX 1060 3Gb GPU (@120w) and would assume that the PSU will be able to cope without it being overloaded. I say temporarily as I intend to upgrade to a Ryzen based system in the coming weeks and will be replacing the PSU with a new good quality one and fitting the old PSU together with this mobo/CPU into a backup machine. I am of the opinion that the PSU is one of the most important parts in a computer and a cheapo PSU is false economy as it could cause serious damage if it fails. However it got me wondering ...is there an actual standard calculation for determining the minimum/ideal PSU wattage requirements needed to run both the CPU and GPU safely without overloading the PSU?