Your watts are just impossible with these voltages, if we are talking about ETH
That is more like 92 + 50 watts = 140w or around 170w or so, remember that many apps dont show the true used power. The 92w is just the core watts. The rx 580 uses a lot more than the rx 480 at same voltage, rx 480 around 68w - 75w at 900mv, rx 580 85w - 95w 900mv.
Strange. Same model for 480 and 580 ?
Talking about partial power has no sense. Just power at wall is a true value.