I have a couple of IBM X366 servers. They are quad-Xeon with 8GB of RAM each. They require two power supplies to be plugged in or otherwise will keep fans turned on full power constantly.
They are inefficient for daily use, but great for lab work. I spin them up, run whatever distributed task I need on 8 cores with 15K SAS drives, usually distributed Sony Vegas renderer, and shut them down. They also make a great lab for virtual machine work, so that does mean bringing the cloud in-house. :)
The X366 is a serious piece of hardware that later got renamed to 3850. Their current incarnation is http://shop.lenovo.com/us/en/systems/servers/mission-critica...