"I based this build on the the first version of the Streacom FC5 fanless case. The case was released in 2011 and I previously used it with a Sandy Bridge CPU. I managed to adopt it to fit AM4 (not officially supported in this version, though the newer FC5 versions support it with the universal CPU mount). The case currently houses passively cooled Ryzen 5600G on Gigabyte Aorus B550 ITX board . The other cooling fin takes care of the Plex GAN 500W PSU. The GPU is RTX 5070 Founders Edition. The case sits in my AV rack under the TV and it's completely silent with normal use like Youtube or playing movies. The GPU fan only kicks in when I use it for gaming. FC5 wasn't designed for the modern GPUs use. I modified it to fit the 5070 and allow more air movement. The top lid was mostly cut out and replaced with mesh grille. There's also a mesh grille underneath the GPU, to allow the air in. The non-gaming temperatures sit around 40C for CPU/GPU. The gaming will take them much higher - 80-85C CPU and 60-70C GPU (with undervolt)"
Source: reddit
