Wild(In)vest: 
4 Miner-Rigs, á MSI 890FXA-GD70, Sempron 140, 2 GB Ram, PSU 1250 W, 3 x HD 6990 OC @ 915 = overall 9.5 GH/s
running diskless, booting via networkboot into heavily customized LinuxCoin, incl. Software-Watchdog and external Watchdog with Remote-Powerswitch (hardreset)
I dare you to buy 4 more and run 4 to a board.4 Miner-Rigs, á MSI 890FXA-GD70, Sempron 140, 2 GB Ram, PSU 1250 W, 3 x HD 6990 OC @ 915 = overall 9.5 GH/s
running diskless, booting via networkboot into heavily customized LinuxCoin, incl. Software-Watchdog and external Watchdog with Remote-Powerswitch (hardreset)