![]() No fan noise and the new SSD was much more responsive. Finally I updated to macOS High Sierra (can’t go any higher on the mid-2011), and the machine ran like a clock. ![]() I bent the Display Port Cable initially and had to order another one from ebay. Display Port Cable (not too difficult to disconnect but quite difficult to reattach).Now you have the four cables to disconnect: So, off comes the glass (you really don’t need suction cups), and after eight screws out comes the screen. I did not want to pay the $39.00 but I wanted to do the upgrade the right way and I knew that a hardware solution to the fan problem was the right way to go. I did not want to control the fans via a software solution so I “bit the bullet” and bought the $39.00 OWC In-Line Digital Thermal Sensor Cable. I also had to be constantly adjusting the smcFanControl settings.Ībout two months ago I decided to go with an SSD drive and I chose the Crucial MX500 SSD. I choose smcFanControl and I was fairly satisfied but I did notice that the back of the iMac still got very hot to the touch. I certainly didn’t want to open the thing back up so I went with a software solution. It therefore ran the fan speed at 100% all the time. My new drive had no temperature sensor on it, so my iMac motherboard didn’t know what the HD temperature was. The Hard Drive that Apple uses from the factory has a proprietary controller on it for reporting the drive temperatures to the motherboard. When I booted up the new install, the iMac fans went crazy. ![]() A few years ago I installed a new 1TB Hard Drive (spinning SATA). Thus providing the maximum cooling it can, this should be below the maximum operating temperature for your drive.I have a wonderful 27″ mid-2011 iMac. This is the temperature that the fan will have reached its maximum speed of 6000rpm. This is the HDD Temperature that the HDD Fan will start increasing its speed from, reaching maximum speed at value specified with “Temperature that Fan Speed is at maximum”. Temperature that Fan Speed will start to increase from You may want to increase this to provide extra constant cooling to your drive, but note this will increase the fan noise. ![]() The fan has a hardware low limit of 1000rpm, and cannot go slower than this, for most users this should be the setting you use. What you are generally trying to achieve is to reach the max fan speed of 6000rpm, about 5C below the max operating temperature for your drive.įor when the fan starts to increase we would recommend setting this about 5-10C above normal idle HDD temperature. This shows the higher the temperature, the faster the fan. The graph on the preference pane shows the fan speed to temperature relationship, temperature along the bottom axis, fan speed up the side. We would only recommend changing settings if you have a drive for which they are not suitable, or you wish to have the fan running more, or less than the defaults provide. So for most users you should leave the defaults in place. We have done lots of testing to find the best defaults to suit most drives and situations, and will continue to improve the defaults in updates if necessary. ‘HDD Fan Control Preference Pane’ Default Settings
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