If you've used the new Raspberry Pi 4 [https://shop.pimoroni.com/products/raspberry-pi-4?variant=29157087445075], or read much about it, then you'll know that it can run pretty hot under high CPU load. Let's take a very quick look at it's thermal performance, and how a couple of different cooling options perform, in particular our new Fan SHIM [https://shop.pimoroni.com/products/fan-shim]. With each generation, the Raspberry Pi packs greater performance into a same-sized package, and the Rasp