Testing the FAN of a new 27-inch 5K iMac

I am using a new 27-inch 5K iMac and want to test the fan to see how loud the fan noise will get.

What’s the best way to push the iMac fan to its limits?

How can I turn on all the programs at one time?

Just apply some heavy effects to an hour timeline, and start a render, then also have have FCPX transcode a bunch of footage for you during the render. That fan will kick in pretty soon as the temp increases.

it is defiantly noticeable, but I don't find it that distracting.

Thanks Fern. I'm new to FCP X and just learning the program.

Do I have to transcode the footage at the same time?

have you tried
www.crystalidea.com/macs-fan-control

...

Thanks Karsten. No, I haven't but will check into this app.

Does the Mac OS have a basic fan control built-in to the system?

hcraig wrote: … Does the Mac OS have a basic fan control built-in to the system?

In best Apple tradition, for sure not, why molesting the user with 'controls' the Mac can do better alone?

What for anyhow???

hcraig wrote: I am using a new 27-inch 5K iMac and want to test the fan to see how loud the fan noise will get...What’s the best way to push the iMac fan to its limits?

IMO the iMac 27 fan is not that loud and doesn't ramp up that quickly. By contrast my 2015 MacBook Pro's fan ramps up at the slightest action.

The easiest way to stress test a Mac's CPU is using the "Terminal" command line according to this article: www.tekrevue.com/tip/how-to-stress-test-mac-cpu/

You can also download and run the Mac version of the Prime95 CPU stress program: www.mersenne.org/download/

And you can stress the GPU by running this test which includes Furmark, commonly used on Windows: www.geeks3d.com/20140304/gputest-0-7-0-o...online-gpu-database/

Even though a well-engineered factory-built computer should be able to run these without any damage, I probably would not leave them running overnight or unattended for many hours.