I haven't tuned the software on these rigs for minimum overhead and I haven't overclocked the video cards yet either. Currently the farm is running at ~6GH/s or ~500MH/s for each 7970. I built it as fast as I could to get the mining started so they are currently running Ubuntu desktop. Ultimately I plan to create a Gentoo USB install that automatically tunes and mines each rig.

Link to imgur album

[]http://i.imgur.com/JqqAthG.jpg

[]http://i.imgur.com/piuEC1u.jpg[/]

[img]http://i.imgur.com/biOdilD.jpg[/]

[img]http://i.imgur.com/epLHvGy.jpg[/]

[img]http://i.imgur.com/i4RXSWC.jpg[/]

[]http://i.imgur.com/nmCdY4n.jpg[/]