The Corsair HX1200i and the Corsair RM1200x SHIFT are tied in this objective comparison, as each component secures one individual specification victory alongside five ties. The most impactful advantage for the Corsair HX1200i is its efficiency, which is 25% better than the alternative. Conversely, the Corsair RM1200x SHIFT holds a 3% advantage regarding its ATX version specification. These units offer comparable overall utility, with the primary distinction resting on these specific technical trade-offs.

Users prioritizing maximum power efficiency should select the Corsair HX1200i to leverage its 25% advantage in that category. Those who require the latest ATX version standard for their build configuration should opt for the Corsair RM1200x SHIFT, which provides a 3% improvement in that specific area. Because both power supplies are otherwise evenly matched across the remaining specifications, the decision depends entirely on whether your system requirements favor superior efficiency or the updated ATX version.