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). This most recent version adds support for every current MacBook, MacBook Pro, MacBook Air, and Mini.I have a wonderful 27″ mid-2011 iMac.

As with any settings-tinkering software, you'll want to use smcFanControl judiciously-but fortunately this application always keeps fans in automatic mode (so speed will increase along with CPU load) and never lets you set the fan speed below the Apple-recommended minimum. SmcFanControl lets you monitor the current temperature (in Celsius or Fahrenheit), assign different minimum speeds for each fan using sliders, and even apply different settings when your power source changes (for example, going back to default fan speed when using battery power). This free, GPL-licensed utility has a single purpose: letting you increase the minimum speed of built-in fans, so your Intel computer will run cooler. If you've got burnt thighs from an old MacBook Pro or you notice that your computer is always overheating and crashing from using CPU-intensive apps (like playing PC games in a virtual Windows environment), you might want to check out smcFanControl. SmcFanControl lets the user set the minimum speed of the build-in fans.

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