I manage 2xHD 6970's with MSI Afterburner
My system is similar. I manage CrossfireX'd HD 6970's with MSI Afterburner set at:
Core Voltage: 1200mV
Power Limit: +10
Core clock: 950MHz (As high as it will go)
Memory Clock: 1450 (As high as it will go)
Adjust Settings\Fan page: Enable user defined auto control so that 50C provides 20% and 80C provides 100%. My Temps do not exceed 70C with these settings on my all air-cooled machine. The fans get noisy, but consider it as sound effects when flying a WW2 fighter. I don't even notice it.
Performance is stellar!
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Fidget
ASUS Rampage III Formula, I7-950 O/C to 4.2GHz, 12 GB Corsair 1603MHz RAM, SanDisk 240GB SSD, EVGA GTX 780, X-Fi Titanium Sound, 1KW PSU, 30" Dell U3011 monitor, TrackIR5, modified Saitek X-52 & Combat Rudder Pedals, Buttkicker Seat Feel, Win 7 Pro, EVGA Precision X, VAC System voice control.
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