The Corsair RM1200x SHIFT is the objective winner of this comparison, securing more total specification victories than the Corsair RM850x. The most impactful advantage offered by the Corsair RM1200x SHIFT is the inclusion of a 12VHPWR connector, which represents a 100% improvement over the alternative. This specific hardware feature provides a significant functional edge for users requiring modern power delivery standards for their high-end components.

Users should select the Corsair RM1200x SHIFT if they prioritize the 12VHPWR connector for their system build. Conversely, the Corsair RM850x is the superior choice for budget-conscious consumers, as it holds a 46% advantage in MSRP. Choosing between these two power supplies depends entirely on whether your priority is the advanced connectivity provided by the former or the cost-efficiency offered by the latter.