Use Onyx or terminal to disable the dashboard widgets....
It dropped my normal usage temp almost 8C.....
I had asked this question in a previous thread that 200 people couldn't reply to! 🙂
Also seems to have made folder opening a bit snappier...
MacRumorUser said:I find sitting in a refrigerator gives me a much bigger temp difference 😉
Disabling dashboard didn't make much difference to my temperature at all.