5x MSI R9 290 Twin Frozr IV
4x Sapphire R9 290 Tri-X OC
http://i.imgur.com/gphtB7b.jpg

Total stable hashrate: 8.25MH/s
Temperatures (in a small den with almost no airflow): 70-79 for the Sapphires, 76-85 for the MSIs.