BlendMaster pointed me to this site of a home brewed render farm made from small IKEA filing cabinet. It has an insane 24 cores, running at 2.4 Ghz each with 48 GB of ram. Pretty ingenious method. It's a Linux system using Dr Queue for render distribution.
"The most amazing is that this machine just cost as a better standard PC, but has 24 cores that run each at 2.4 Ghz, a total of 48GB ram, and just need 400W of power!! This means that it hardly gets warm, and make less noise then my desktop pc."
I also noticed on Janne's main website that he uses Blender in his work flow.