Why use a small heat sink when the entire chassis itself can be one instead? This bulky industrial PC may be fanless, but it sacrifices performance in the process.
https://www.notebookcheck.net/Impact-Display-Solutions-IMP-3713-V2-16-500-Fanless-PC-Review.536488.0.html
We were so busy wondering if we could that we never stopped and asked ourselves, "is this a complete piece of s***?".