Off-topic but somehow related: I found it hard to find a mini/micro server chassis/cases of good quality.
This one seems to be one of the better ones.
(It might make sense to open a separate thread for this.)
The problem with small server chassis is that they usually contain compact power supplies with small fans, often 6 cm, sometimes even 4 cm. And these are usually loud and/or have a nasty high-pitched sound. Might be okay if you put them in a server room, but definitely not okay for the living room, home office or similar.
For the server in my home office I opted to use a mini tower with standard ATX power supply (with a silent 14 cm fan), but put a mini-ITX mainboard
(*) in it with low power consumption. Thankfully, mini-ITX, micro-ATX and similar SFF boards are upwards-compatible to standard ATX boards.
If you want to go even smaller, Raspbery-Pi and similar comes to mind. Of course it depends on what actual tasks the machine is going to perform – For example, if you need high I/O bandwidth, a Raspberry-Pi is
not going to make you happy, unfortunately.
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(*) It’s a Gigabyte H77N-WiFi. Nice little board with dual GbE network, and one PCIe slot if you need 10 GbE, additional SATA ports or whatever. I’ve put 16 GB RAM and an Intel i3-3225 on it that uses very low power when idle, but delivers sufficient performance when under load.