The be quiet! Dark Rock Pro 4 is the objective winner of this comparison, securing two out of three spec victories. Its most significant advantage is a 14% higher TDP rating compared to the alternative. This superior thermal capacity makes it the more robust option for managing heat output in demanding systems. While the DeepCool AK400 falls short in thermal performance, it maintains a distinct advantage in affordability, boasting an MSRP that is 67% better than its competitor.

Users prioritizing maximum cooling efficiency and thermal headroom should select the be quiet! Dark Rock Pro 4 for their builds. Conversely, the DeepCool AK400 is the ideal choice for budget-conscious builders who require a functional cooling solution without the premium cost. By choosing based on these specific advantages, users can align their hardware selection with either the superior thermal specifications of the larger unit or the significant cost savings offered by the smaller model.