If you set the temperatures too low, your drive will be nice and cool, but your fan will drive you crazy. At temperatures somewhere between 45C and 70C, your fan will spin at some speed between 1100 RPM and 5500 RPM. If the temperature is at or above 70 degrees Celsius, then your fan will spin very fast (and loud) at 5500 RPM. At that speed it's difficult to even hear the fan. If the temperature reported by your drive's SMART data is at or below 45 degrees Celsius, the fan will spin nice and slow at 1100 RPM. In your case with values of 1100 RPM 45C and 5500 RPM 70C, the fan will behave as follows: To answer your question about what 1100 RPM 45C means, it's easier to just explain how the values the lower and upper bounds work.
(As I'm sure you've already noticed, setting SSD Fan Control to SMART, followed by a reboot, will also solve this) Now just set the lower temperature bound back to 45 and it will settle down to 1100 RPM again. To fix this and get it back to normal, make sure SMART is selected, then tweak the lower temperature bound to a value lower than your ambient temperature of 38 (for example set it to 30), and wait for the fan to speed up.
#Why will the optimum app not work for mac manual#
In your case, I'm willing to bet that you have experimented with setting the Manual speed to 1500 RPM at some point in the past. Rather than settling on the 1100 RPM set in the low temperature bound, mine is now stuck on 1300 RPM. In my case, where I had experimented with setting the Manual speed to 1300 in the past, I can reproduce this bug by simply switching from SMART to Auto and back to SMART again. If you play around with the Auto, Manual, and SMART buttons, the app will get "stuck" at the incorrect fan speed (as you show in your screenshot). Unfortunately, you've also gotten a lot of useless answers from our fellow forum users. Great app, but I see you've stumbled across the same bug as me.
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