From a visual comparison, the walls of the Pi4 Flirc look noticeably thinner than the Pi3 Flirc, but I have no idea if that makes any difference. It's harder to tell on the Pi4, because it's WiFi performance seems to be lower, and more variable than my Pi3 models (things have improved with updates, so I assume the software is still being optimised).
Do note that the Flic is plastic on the bottom and part of the side near the wireless antenna (unlike some other cases which enclose the Pi in a metal box). On my Pi 3B(+) models, if there is any effect, it's negligible (I have not noticed a significant loss in signal or performance after moving both a 3B and 3B+ into Flirc cases). I've got to wonder how much these metal cases affect WiFi and Bluetooth performance?
#Flirc raspberry pi 2 install
It is louder than the Noctua 40 x 10mm fans I have on other systems, but you can install Pimoroni's software to toggle the fan on and off as needed (Buster required). It's pretty quiet, but definitely not silent. It has an addressable switch and RGB LED which you could use for other things (default is manual fan control and temperature indicator). On the other hand, the Fan Shim is a pretty cool little gadget (pun intended). In the end the goal is to keep the Pi cool enough to maintain maximum performance and prevent heat damage, and temps below 80C do that, so does a few C difference here or there really matter? The Flirc makes no noise, does not require any additional power, and will not pull dust into your system (like a fan). However, if both solutions keep the Pi4 below the 80C throttling temperature, then I would prefer the Flirc. In my experience, a fan alone works better than a heatsink alone.
I don't have a graph, but if I was a betting man, I'd put my money on the fan. I would really like to see graph of Flirc Case vs Fan Shim.
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