Which could irreversibly damage your computer. This tool will allow you to write values to the SMC From here on you must read the following first: Warning Its called smc and is also available separately on GitHub. What you need is a utility that is included in the smcFanControl tool. Luckily I found a way around that and reduced the minimum to 1000rpm, which is considerable less noisy! It makes all the difference to me. I downloaded Macs Fan Control, but you can’t reduce rpm below the minimum 1200 (but you can go up to 2700). So the default 1200rpm can be seen as a static value: it doesn’t go above or below that no matter what you do to the system. It seems that on my low spec iMac, the regular (Apple auto-controlled) rpms never get regulated above those 1200rpm, even when running Unreal 3D benchmarks. But then, you hear the fan “idling” at 1200rpm resulting in quite a strong airflow and distracting noise no matter what your system load is. Unbearable in a quiet environment.Īfter installing the SSD, the speed and noise improvement are tremendous. However, apart from the HD being way to slow, it is also very noisy: there is a hiss type of sound and rumble from the rotational mass.
Not an easy decision since you need to cut the Mac open. I finally replaced my hard drive in my 2015 iMac 5k with a Samsung 860 SSD. NOTE: This guide apparently only works up to Catalina and does not work on Big Sur.
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