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@hippy
Higher CPU usage causes more heat which causes the fan to spin up to compensate. Sounds normal to me.
I know for the Crapintosh laptops you can get some software that controls the fan speed manually.
Crapple in their infinite wisdom turn down the fans to have a quieter machine. The guys at work with crapples have some 3rd party app that allows them to increase fan speed to stop their machines over-heating.
I'll ask one of them what it's called..
Also, check that the fan is clean and nothing is obscuring any of your computer vents - the cooler you can run your machine the less the fans will be needed. I know my laptop sounds like it's working harder when I let dust build up in the fan vent area.
smcFanController is the application they use to control their mac laptop fan speed.