I've added these three Dell C1100 server blades to the Pixie Hollow network. They each have two X5675 Xeon processors (HyperThreaded hex core @ 3.06GHz) and 48GB RAM. $325 each. I added an OEM Win7Pro license and a 256GB SSD to each. They are (top to bottom) Polyhymnia, Miranda, and Cassiopeia.