ASRock went for a small internal CPU cooler and a thermal pad. How Zotac of them. Once again, an ultra low-power chip will most likely be able to throttle, or at least reach temperatures we're not confortable with.
It looks like the recent fanless mini PCs will do more harm than good to the fanless revolution. We're not impressed. For best results, go for a sizeable CPU cooler in a mesh / convection friendly chassis, or an actual heatsink case.