The Corsair SF850 is the objective winner of this comparison, securing more individual specification victories than its competitor. While the be quiet! Pure Power 13 M 1200W offers a significant advantage in total power capacity, providing 41% more wattage, the Corsair SF850 delivers the most impactful technical improvement. By offering 25% better efficiency, the Corsair unit demonstrates superior power management capabilities that define its overall lead in this head-to-head evaluation.

Choose the Corsair SF850 if your priority is high-efficiency power delivery for your system. Conversely, select the be quiet! Pure Power 13 M 1200W if your build requires the substantially higher wattage capacity provided by that unit. Each power supply serves a distinct need, with the former excelling in energy performance and the latter providing the necessary headroom for more demanding power requirements.