One propeller fan cools the AMD X570 chipset, blowing heat directly onto the heatsink while slightly cooling the entire structure. Another propeller fan sweeps across a small heatsink assembly, primarily cooling the frame. This heatsink removes heat from the chipset, transistor components, and inductor coils. The two 30mm ( 0.5 -inch) fans are model ASB0312HP-00. Normally, small fans fail quickly, but they've tried. He said these fans have "held on" for 60, 000 hours, and there haven't been similar models in the catalog for nearly seven years, but these propeller fans are called Super Propeller Fans; they are essentially improved sliding bearings with a 50, 000-hour lifespan.