Solved Can Someone Confirm The Fan Is Much Louder After Upgrading The Cpu Imac 27 2017

Chosen Solution

Can someone confirm, that the fan is much louder after upgrading the 2017 5k 27” i5/3.4GHz to a i7/4.2GHz (with i7 7700K)? I nearly never heard the fan before, but now when using the full power of the processor (e.g. rendering in blender with 8 threads at 100%) the fan is very loud. I’m not sure if this is ok or if I did something wrong with the termal paste application or when installing the cooling system.

So, it seems to be normal, I also checked the temperature and speed with Intel Power Log 3.7, it seems that 4.2GHz is only available for a few seconds, the processor is throttled down to approximately 4.0 GHz when running all cores at 100%. Temperature is about 96°C, Fan Speed about 2700 rpm, what is the maximum speed. So I think when upgrading a iMac 5K 2017, the 4.0 GHz i7 will be enough because the cooling system is not good enough to handle the i7 7700K at 4.2 GHz for more than a few seconds.

Yeah same here, after upgrading from 3.8 i5 to 4.2 i7 7700k fan is definitely more noticeable and every so often it will ramp up what’s quite annoying