The be quiet! Pure Power 13 M 1200W and the Corsair RM1200x SHIFT are evenly matched, resulting in an objective tie across the majority of their specifications. While both units offer identical performance in five key areas, the be quiet! Pure Power 13 M 1200W holds a notable advantage in MSRP, which is 12% better than its competitor. Conversely, the Corsair RM1200x SHIFT provides a 3% advantage regarding its ATX version specification.

Users prioritizing cost-efficiency should select the be quiet! Pure Power 13 M 1200W, as it offers a superior MSRP. Those who place a higher value on the latest hardware standards should opt for the Corsair RM1200x SHIFT due to its improved ATX version. Because both power supplies share the same performance profile in most categories, the final decision rests solely on whether the buyer prefers the lower cost or the updated ATX standard.