Yeah your going to have to put some thicker pads on them man.

Here my 5970 on air
GPU 1 and 2 5970
GPU 3 285GTX

Max temp on core with extreme burning mode was 80.5 C
Max temp on Vram was 99C extreme burning mode can do upto 120 before it effects anything.


Heres the screen shots.



link to higher quality screen