The be quiet! Pure Power 13 M 850W and the be quiet! Straight Power 12 850W are tied in this objective comparison, as each unit wins two out of seven measured specifications. The most impactful advantage for the Pure Power 13 M 850W is its MSRP, which is 19% better than its competitor. Conversely, the Straight Power 12 850W holds a significant edge in its modular design, which is 50% better than the alternative.

Users prioritizing budget efficiency should select the be quiet! Pure Power 13 M 850W to take advantage of its superior MSRP. Those who prioritize cable management and system build flexibility should choose the be quiet! Straight Power 12 850W for its significantly better modular design. Because both units offer identical performance across the remaining specifications, the final decision rests entirely on whether the user values lower initial costs or enhanced modularity for their specific build.