The Corsair SF850 is the objective winner of this comparison, securing more individual specification victories than its counterpart. While both units share several identical features, the Corsair SF850 holds a significant lead in power efficiency, outperforming the Corsair RM1200x SHIFT by 25 percent in that category. This efficiency advantage makes it the superior choice for users prioritizing energy optimization, whereas the Corsair RM1200x SHIFT offers a 41 percent advantage in total wattage capacity for more demanding hardware configurations.

Choose the Corsair SF850 if your primary goal is maximizing power efficiency within your system build. Conversely, select the Corsair RM1200x SHIFT if your hardware requirements necessitate the higher wattage capacity provided by that unit. By evaluating your specific needs for either raw power output or energy efficiency, you can determine which of these two components better aligns with your current PC build requirements based on these distinct performance advantages.