A few noob questions that could resume common issues...:-)

[redxfred]

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!