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7990 crossfire?

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Do 7990's in crossfire overheat on air (I have HAF932 case)?
I know some have reported this but not sure what the reality is.
 
I have very good case airflow (4x120mm fans blowing from side and 3x120mm top extract plus 1x200 front extract ) as I currently have two overclocked 6990's but I did read about one of the 7990 GPU's getting very hot on Toms Hardware when two cards ran in crossfire. Also I'm still on Gigabyte UD5 EX58 so the spacing between cards is only the two slot minimum. I will be doing a CPU upgrade very soon (4770k at 4.6ghz which will provide more spacing).
 
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