I have put the the option in the bios to disabeled and now it's pretty bearable. The fan is not always running, just comming up every once in a while, but switching off in between. The other option from Z3tor in this post seems to be pretty viable, but you have to manipulate quite a bit - for me, the situation as is is sufficient - so I didn't follow up. I've changed the Disk to a SSD, so maybe my fan comes on less than with the regular HD.
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