“On the plus side;
* The heatsink is a cost-effective way to keep the CPU at around 35°C to 40°C when the RPi4B is idleing, and 50°C to 55°C when active.
* It's unobtrusive, simple to apply, and it works.
On the negative side;
* The difference in height between the CPU and the system chips is such that the heatsink will contact only the CPU, so it can't be used to cool all of them. In practice, that's not a problem.
* The heatsink partly overhangs the WiFi chip, so it may interfere with the Wifi signal. Not a problem unless you're using the WiFi, of course.
* The adhesive remains slightly liquid when hot, so I'm not sure the heatsink would remain attached over the long term if the RPi were positioned vertically.
Overall, worth the money for a simple practical unobtrusive way to keep a RPi4 cool under routine operation. If you intend to hammer the CPU, though, you should look at heavier-duty alternatives.”
