I'm sure this is a dumb question on account of how obvious it seems to me, but has anybody tried simply putting real heatsinks on this thing? Not putting it in an Al case or something milquetoast like that, but actually putting a proper finned heatsink/radiator directly on the SoC with a bit of thermal grease between them. Like you would do for a real PC, except without the fan.
AFAIK, the peak power draw of these boards is substantially less than 10 watts, so regardless of how high the temperature of one small part of it becomes, we're still talking about a rather small amount of heat energy that needs to be pulled off the board. My gut says that a passive heatsink with a relatively large surface area to facilitate radiation and convection currents should be able to do the trick.
AFAIK, the peak power draw of these boards is substantially less than 10 watts, so regardless of how high the temperature of one small part of it becomes, we're still talking about a rather small amount of heat energy that needs to be pulled off the board. My gut says that a passive heatsink with a relatively large surface area to facilitate radiation and convection currents should be able to do the trick.