Finally, you need to live with this thing - if the fan is too loud, it's not going to be very pleasant to sit near it. You also don't want to run the fan too fast for extended periods of time, or you risk wearing out the fan's bearings (probably not very likely, but something to consider).
You don't want to run the drive so hot that it cooks itself to death after just a year or two. Whether your values of 45C and 70C are good for you depends on several factors, the most important being the manufacturer's recommended operating temperature for your particular SSD (or hard drive).
If you set the temperatures too high, your fan will be nice and quiet, but you run the risk of cooking your drive to death. 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.
#FAN CONTROL FOR MAC SIERRA 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. Does anyone has a suggestion what I could do, or even better, a solution? This all happens like a minute after turning on so the fans do not immediately blow at maximum speed.Great app, but I see you've stumbled across the same bug as me.
#FAN CONTROL FOR MAC SIERRA INSTALL#
Now i wiped my ssd and did a fresh install of high sierra, installed all updates and installed ssd fan control. I uninstalled the app and reinstalled it, I also tried smcfancontrol, all with no succes. I tried fixing it with the ssd fan control program but with no luck. However since, i guess 3 days, 1 minute after turning the computer on, the fans again were blowing at maximum speed. After installing I had no problems anymore for around 6 months. They told me I needed to install a program called SSD Fan Control. I called my local computer store here in Holland and they told me this was happening because the new installed SSD has no thermal sensor, so the fans would just blow at maximum speed.
After successfully installing it, the fans from the iMac were blowing at maximum speed. A while back I replaced my HDD for a new Samsung evo ssd for my mid 2010 iMac.
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