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I just replaced my Macbook Pro's Mid 2012 HDD with a Samsung 850 EVO SSD. The performance is great and I am very happy, but I noticed that the fan seems to run faster. It is not a drastic change, but it is noticeable. I have downloaded iStat Menus, the Exhaust of the fan is 2000 rpm and the Temperature is a bit over 50°. Is that normal and is there any chance I did something wrong while replacing the HDD? I am running Yosemite and I did a SMC reset.

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Have a look at Controlling the fan speed in Mac models after an SSD upgrade. Extracted from that article:

  1. Download the app “smcFanControl
  2. Install smcFanControl into your Applications folder
  3. Open Automator
  4. Create “New Application”
  5. Go to Utilities > “Run Shell Script” and delete the word “Cat”
  6. Copy the following code into the Shell Script:
  7. /applications/smcfancontrol.app/Contents/resources/smc -k F1Mx -w 1770
  8. Test the Shell Script by clicking on “Run” and your fan should stop running at full speed
  9. Save the application to your SSD as “maxfanadjustment”
  10. Open System Preferences, go to Users & Groups, the tab for Login Items
  11. Click the “+” to add a new application and navigate to the Automator file you just created and add it.
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    Thanks! After some extended research I found out statements that 2000 rpm is actually normal for MBP 2012 – Georgi Apr 2 '15 at 14:31
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    @Georgi if you found references solving your question feel free to use full answer with link to references to help others with similar question. – Ruskes Apr 2 '15 at 17:27
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Don't download smcFanControl, infection "PUA.OSX.InstallCore" found in the .dmg file.

  • Can someone confirm if this is true? if so the answer above should be removed or modified. – Deesbek Nov 29 '16 at 20:08
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    What URL did you find the problem? It's common that some side sites get messed up / malicious downloads. Good information if we can narrow down what source to avoid. I edited the answer above since MacUpdate might not be the best place to get smcFanControl. – bmike Nov 29 '16 at 20:09

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