Literally what the title says you put in the stock TDP(for GPUs I recommend using W1zz's power draw numbers), stock voltage, OC voltage, stock frequency and OC frequency then you press calculate and you will get the parts total power draw and the current on the output side of the VRM(so you can check that you won't blow up the VRM). I checked the accuracy of the program using W1zz's gpu power draw and voltage tuning power draw figures and can say the program is not very accurate for GPUs because it under calculates GPU power draw figures because of VRM efficiency drops that GPUs suffer as they are over clocked(I plan to add a method for compensating). For CPUs however it is within a +/- 5% error margin. Here is the LINK. I would also appreciate if people tested the accuracy for me so I can tweak the algorithm. To test the accuracy take one of those outlet power draw meters and post the power at stock(use Cinebench for CPUs and Furmark for GPUs) and OCed power draw(use Cinebench for CPUs and Furmark for GPUs) here so I can compare if the differences line up if they don't I'll tweak the equation until it does. Also tell me your PSU efficiency as that has a small but significant effect.