I've had a good experience with using a passive heatsink case on my Pi 4s. It's not lightweight, but there's a lot of thermal mass and plenty of surface area f

I've had a good experience with using a passive heatsink case on my Pi 4s. It's not lightweight, but there's a lot of thermal mass and plenty of surface area for cooling. https://thepihut.com/products/aluminium-armour-heatsink-case-for-raspberry-pi-4 https://thepihut.com/products/aluminium-armour-heatsink-case... I've got one sitting here driving some animations in chromium on a spare display, currently running with a load average of 1.1 (so not working flat out on all cores, but doing a moderate amount of work). CPU temp is 49C, and the case/heatsink is just pleasantly warm to the touch.