The Corsair AX1600i and the Corsair RM1200x SHIFT represent a tie in this objective comparison, as each unit leads in three out of nine evaluated specifications. The primary advantage for the Corsair AX1600i is its efficiency, which is 50% better than its counterpart. Conversely, the Corsair RM1200x SHIFT offers a significant edge in connectivity, featuring a 12VHPWR connector that provides a 100% improvement in this specific category compared to the other model.

Users prioritizing maximum power efficiency should select the Corsair AX1600i for their build. This unit is best suited for those who value energy optimization above all else. Alternatively, the Corsair RM1200x SHIFT is the superior choice for builders who require the 12VHPWR connector for modern hardware compatibility. Choosing between these two power supplies depends entirely on whether your system configuration demands higher efficiency or the specific convenience of the included 12VHPWR interface.