Even if it is an 80Plus Platinum certified unit, the efficiency of the Toughpower Grand Platinum is surprisingly high while the power supply operates at 50% capacity, reaching up to 93.5% when the source voltage is at 110VAC and goes further up by 0.6% if the source voltage goes up to 230VAC. Unfortunately, these figures diminish quickly if the load is either increased or decreased, yet the power supply always honors its 80Plus Platinum certification and the efficiency never drops below 90%.
The thermal performance of the Toughpower Grand Platinum 700W power supply appears strange at first but that is because the flower shaped fan did not start rotating before the load exceeded 30% of the power supply’s capacity. Once the fan starts, there is a temperature drop and then the temperature will start rising again as the load increases, reaching a delta of about 9°C under maximum load.
As the fan is not even rotating beneath 40% load, there were no sound volume recordings at all before that point. Once the fan starts and up to 80% load, the noise level is within the audible range but very well comfortable. That quickly changes if the load exceeds 80% of the unit’s power capacity, where the fan starts speeding up significantly and becomes much louder than before, reaching at maximum load a noise level that is about 8 times higher than that at 50% load.