After downloading Lion the noise level of the fans increased. A noise which did not exist with Snow Leopard. Any ideas how to reduce noise?

After downloading Lion the noise level of (what I believe to be ) the fans increased. A humming noise which did not exist with Snow Leopard. Any ideas how to reduce this noise?

I have seen this mentioned a dozen times, here, on Lion,and MacRumors.
Nope. Usual suspects.
And whether you tried a clean install instead (backup and erase) and then use MA to import

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