I have a minor rig with two video cards running. My power supply supports 750 Watt, and it is in the Gold category when it comes to being energy friendly. Out of curiosity I bought this tool to measure the amount of energy my rig actually uses (puts it into the connector, followed by the computer plug). According to this tool my rig uses a total of 170 Watt. Is that so? If I add two-three more video cards and this tool will say 650 Watt, is that safe then to use, and the power supply should be enough for that?
Ps: I use two poor graphic cards for mining, two pieces of Gigabyte GeForce GTX 1050 Ti OC 4G 4GB. Of course I want to add more cards to the rig, and that is why I am asking....
Or is there something about the power supply being energy friendly, and the graphic cards actually use a higher amount of watt, but the power supply somehow minimize it? I am totally new to this and that is why I am asking.