IMac Retina fans are loud direct after starting – is that normal?

My machine:
iMac Retina 5k i7
32 GB RAM
Yosemite 10.10.1
AMD Radeon M295X
FusionDrive
External monitor DELL 3214Q running at 3008 x 1692 Resolution (60Hz)
Monitor is official supported running on Display Port 1.2
After starting up my iMac and without doing anything the fan(s) raising speed after just about 10 seconds ...
I´m wondering if this is normal ???
Thanks!
Markus

Reset SMC. http://support.apple.com/kb/HT3964
Choose the appropriate method.
Best.

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If you haven't tried it, reset the SMC. http://support.apple.com/kb/HT1806
Reset the PRAM and NVRAM. http://support.apple.com/kb/HT1379
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IMac Retina fans are loud direct after starting – is that normal?

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