I bought a raspberry pi 4 case, and it came with these heat sinks you see in the picture + a fan. From the sizes, I guess the flat heat sink is for the CPU. I kind of find it hard to believe that this works at all, and I'm more inclined to use one big heat sink with spikes for the CPU rather than this flat heat sink. From my understanding of physics, the reason why the heat sink with spikes cools is because of the high conductivity of aluminum + the increased surface area.
Anyone tested this flat heat sink? Does it really work?