7680 vs 5680

5680 seems to be a better design. 7680 appears to have heat issues.

I have read everything online on this - and there are many people talking about heat issues.

Their are of course significant feature advantages in 7680 (More ports, CAMM memory). 

Is the 5680 as a cooling environment and chassis vastly superior design to 7680?

The 5680 was designed "ground up"