My laptop came with 3 fans underneath. While folding it would get up to 95c, I modded a 4th fan to fit and that helped by about 5c. getting a zalman 1500 notebook cooler helped by another 10c, then switching to the new zalman 3000 cooler (big giant 220mm fan) droped another 10c. So now I can fold at 70c. Keep in mind this is a desktop cpu.
So I'd say the most important is to keep it elevated above a smooth hard surface, a cooler is very handy if you're not too mobile with it and tend to use it in the same place all the time.
edit: I also carry around a small 8" desk fan to make sure I dont have any heat build up on the desk behind the laptop.
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