When you open HWiNFO64 sensors, you'll be presented with a long list of items. Anything with a lightening bolt next to it is a power reading (might be volts, amps, watts). To see your CPU power usage, double click on "CPU Package Power" and to see GPU power usage double click on "GPU Core Power" and/or "GPU Chip Power" (you'll have to check to make sure one of these doesn't include the other) and "GPU VRM Power In"(again check to make sure this isn't already included in one/both of the previous GPU power readings I mentioned.