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I have a 2 x 7970 (Gigabyte) rig running right now on Ubuntu 12.10 running the ATI 13.3 Beta drivers. I tried the stable release but the cards wouldn't pull more than 650 MH/s combined and the fan speeds were reading inaccurately. Once I updated the driver to the beta release they both started getting somewhere between 650-680 MH/s each so I am getting about 1.35 GH/s right now. They are over clocked at 1100,1050 (GPU 0,1) 1375 Mem clock. Intensity 9, Powertune 20. Set the fan speeds to keep the cards around 78.0C consistently. I think you would have to liquid cool them to push them any harder but I could be wrong. I added another chassis fan that pulls heat from the cards outside the box as well.
ASUS Sabertooth 990FX Motherboard
AMD 8-Core AM3+ processor (3.4Ghz)
8GB DDR3 RAM
2 x 7970 Gigabyte Radeon cards
850W Modular PSU
Happy Mining.
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