Active air-cooled heat sinks are among the most commonly used thermal management solutions in broad applications. Although reducing the thermal resistance of a heat sink is one of the main goals of developing an efficient heat sink, pressure drop across the heat sinks is another important parameter, as such high pressure drops may impede utilizing the heat sink regardless of its low thermal resistances. As a result, reporting thermal performance of a heat sink without pointing to its pressure drop would lead to confusion and uncertainty about the functionality of the heat sink in practical applications. In this study, the crucial role of pumping power in designing and selecting efficient heat sinks is demonstrated by performing experiments on perforated-finned heat sinks at five different porosities, and comparing the results with those of a heat sink without perforations. This study presents a practical insight about comparing the performances of different heat sinks, as well as a new family of efficient heat sinks.