The be quiet! Pure Power 13 M 850W and the MSI MPG A850G PCIE5 are objectively tied in this comparison, as each unit leads in only one specification while matching in five others. The most impactful advantage for the be quiet! Pure Power 13 M 850W is its ATX version, which is 3% better than the alternative. Conversely, the MSI MPG A850G PCIE5 offers a significant lead in modularity, providing a 50% advantage in that specific category.

Users prioritizing the latest ATX version standards should select the be quiet! Pure Power 13 M 850W for their system build. Alternatively, those who place a higher value on modularity for easier cable management and installation should choose the MSI MPG A850G PCIE5. Since both power supplies share identical performance across the remaining five specifications, the final decision rests entirely on whether the user prefers the specific ATX version or the superior modular design.