The Thermaltake Toughpower GF A3 850W is the objective winner of this comparison, securing more individual specification victories than its competitor. While the be quiet! Pure Power 13 M 1000W holds a notable advantage in total power capacity, offering 18% more wattage, the Thermaltake Toughpower GF A3 850W provides a more significant lead in its primary area of strength. Specifically, the Thermaltake unit is 50% better in terms of its modular design capabilities.

Users prioritizing maximum power output for high-demand systems should select the be quiet! Pure Power 13 M 1000W to utilize its superior wattage capacity. Conversely, those who value cable management and system build flexibility should choose the Thermaltake Toughpower GF A3 850W, as its modular design offers a substantial advantage. The choice between these two power supplies depends entirely on whether your build requires the extra headroom of the higher wattage or the convenience of the modular configuration.