Man, push this QX6850. 8*400 is too low for this beast. And use ATI tool 0.27b3 to rise Vcore voltages. As I see you are on water, you can flash your card with Vmod bios 1.35v without problems. I use 1.35v Vmod bios and the temps are 53-55*C under load with 1007 GPU. Your sistem have big potential for performance.
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