R600 is hot and it is even hotter than anyone wants to admit. Last time I heard 175W number and G80 should be around 135W but R600 is hitting even more.
Our sources confirmed that the numbers are even higher than anyone expected as it dissapates 200W. The 9.5 inch cooler involves heat pipes, dual slot and the fan blows the air out.
The 12.5 inch R600 probably branded as Radeon X2900XTX is for the OEMs only, can probably last longer, and passes all the tests. 200W is almost two times of the Quad core or Athlon FX heat dissipation.