Use it to safely set the minimum speed of the left and right fans individually. I especially liked three customizable presets for when my computer is connected to AC power, running off its battery or charging, which allow smcFanControl to set different speeds for each fan automatically, as soon as the power source changes. With smcFanControl, you have total control of the computer’s fans, all the time. The said, I’ve always wanted some control over my Mac’s fan speed but I understand why Apple is reluctant to provide such an option as it could easily lead to CPU failures every time someone who doesn’t know what they’re doing reduces the fan speed below the minimum. Worse, I’ve even had cases when the fans in my MacBook Pro would intermittently start spinning like crazy, without any app running whatsoever, due to some old process stuck from prior updates. Your Mac may also suffer from overheating when running heavy apps and GPU-intensive games, or due to background processes such as Spotlight and Photos indexing. macOS will also lower the clock frequency to give the processor a chance to run slower and cool off. In order to protect the internal components, the built-in fans kick into overdrive to bring the overall temperature of the CPU/GPU/HDD down. I blog from the beaches during the summer so my notebook quickly becomes unbearably hot due to the heat from direct sunlight. A free macOS app called smcFanControl lets you individually control the fans built into every Mac desktop or notebook in order to make your computer run cooler.
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