One of my block crates...

http://www.youtube.com/watch?v=wrJVzvJO7EE


six 5870s
two PSUs
hard drive removed, running on 16GB USB flash*
4GB Ram DDR3 (going to downgrade to 2GB RAM so I can put all this extra ram in my personal server)*
$18.50 AM3 CPU*

*  Because I am all about building cheap.