I'd have to respectfully disagree with 20salmon. Looking at the specs, the Aerocool DS is 81.5CFM @ 2.29 mm H2O & 23.1 dBA while the Bitfenix Spectre Pro is 56.2CFM @ 1.24 mm H2O & 18.9 dBA. If you're looking for performance with a radiator, you want higher static pressure. For a mild sacrifice on dBA, you get 25CFM more airflow at nearly double the static pressure. In my book, that makes the Aerocool the clear winner for this use case.