5K iMac Fan Noise Unbearable.

Thanks for your reply. I should have mentioned I did reset the SMC prior. First thing I did. This is brand new and I have now found more threads on Apple Support Communites with the same issue. Well I don’t think it’s an issue but more expected. It’s not a hardware noise like a broken fan but a fan running at high speed to cool the iMac. I work mostly at night in a quiet room so the noise is loud enough I need to close the door. I’ll have to use the 14 day return. Thanks again.

Thanks for your suggestion. My scenario is a bit different. I can power on the iMac and check emails etc okay with fan speed at 1200rpm but as soon as I open multiple apps that use energy, the fan speed goes to max 2700rpm and is unbearable. If I quit one or more of these apps it reverts to normal 1200rpm. In a quiet room at night when I work it’s too much. It may be within spec due to the configuration but I can’t do it. Too noisy.

The specs I have are as follows:

iMac 5K 2017, 4.2GHz i7, Radeon Pro 580 w/ 8GB video memory, 8GB DDR4 and a 2TB Fusion Drive. I’ll run EtreCheck when I get home. I don’t think I have and hardware failures based on what I’m experiencing however due to the fan noise I did originally believe so.

I guess with the higher spec the fan needs to make sure the iMac is cool and therefore hits 2700rpm as soon as it starts doing anything heavy. It’s just so loud that I feel it could do with 2 fans like the new iMac Pro design. I’ll still run EtreCheck and go from there.