2017 iMac: i7-7700K hot & loud, i5-7600 cool & quiet

Started Jul 5, 2017 | Discussions thread
mrmut Contributing Member • Posts: 610
UPDATE: CPU vs GPU fan behaviour

An update regarding fan noise in relation to GPU utilization:

iMac is silent whatever you do with 3.4 or 3.5 GHz CPU. I edited video, played games and processed stuff in DxO and fan was mostly rock stolid at 1200.

GPU tends to cause ramping up the fan to about 1400 with the graphic intensive stuff.

However; it will do the same idling if you have external monitor connected, regardless of resolution. Few days ago I forgot to unplug my projector from the mac after the movie, and the next day I noticed that fan is @ 1300-1400 RPM.

Unplug screen and it is all fine. Resolution of the projector is common HD.

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