The AMD-based mini PCs like this that’ve been showing up recently are cool, but I’m guessing that they all get pretty hot and noisy when under load (similar to a compact laptop).

I think it’d make for a compelling product if one of these extended their vertical footprint a bit, making for a more cube-like shape and adding space for a 2-4x more heatsink and a big slow fan (maybe even a 200mm fan if making footprint slightly larger is permissible). It’d be a bit larger but cooler and much more quiet.