The be quiet! Straight Power 12 850W and the Corsair RM1200x SHIFT are evenly matched, resulting in an objective tie across the evaluated specifications. While both units offer comparable performance, they each hold a distinct primary advantage. The be quiet! Straight Power 12 850W provides a 38% better MSRP, making it the more cost-effective option, whereas the Corsair RM1200x SHIFT offers a 41% higher wattage capacity for more demanding system configurations.

Choose the be quiet! Straight Power 12 850W if your priority is minimizing your initial investment, as its superior MSRP makes it the more economical choice. Conversely, select the Corsair RM1200x SHIFT if your build requires significant power overhead, as its higher wattage capacity is better suited for high-draw components. Both power supplies provide reliable options depending on whether your focus is on budget efficiency or maximum power delivery.