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Fixing 'Cannot Use External GPU on macOS'

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Solving the 'Cannot Use External GPU on macOS' Dilemma

Hello, fellow Mac enthusiasts! Have you ever experienced the frustration of connecting an external GPU (eGPU) to your macOS device, only to be greeted with the disheartening 'Cannot Use External GPU' message? If so, you're not alone. This issue can be a major roadblock for those looking to boost their Mac's graphics performance. But fear not! In this article, we'll guide you through some straightforward steps to overcome this hurdle and get your eGPU up and running smoothly with your macOS device.

Understanding the Issue

Before diving into solutions, let's briefly understand why this issue occurs. macOS is known for its robustness and seamless user experience, but it can sometimes be finicky about hardware compatibility, especially when it comes to external devices like eGPUs. This might happen due to various reasons such as software updates, compatibility issues, or incorrect settings.

Step 1: Check Compatibility

First things first, ensure that your eGPU is compatible with macOS. Apple has a list of supported eGPUs, but it's also wise to check the manufacturer's website for the latest compatibility information. If your eGPU is supposed to be compatible and you're still facing issues, move on to the next steps.

Step 2: Update macOS

Running an outdated version of macOS might be the root of your eGPU woes. To check for updates:

  1. Click on the Apple icon at the top left corner of your screen.
  2. Select "System Preferences" and then "Software Update".
  3. If an update is available, follow the prompts to install it.

Keeping your macOS up to date ensures that you have the latest drivers and patches, which might resolve your eGPU issue.

Step 3: Connect Properly

This might sound obvious, but ensuring the eGPU is properly connected can solve a multitude of problems. Make sure the eGPU is plugged into the right port, and the power supply is sufficiently supporting it. Sometimes, simply disconnecting and reconnecting the eGPU can work magic.

Step 4: Check the Peripheral Connections

If your eGPU houses additional peripherals (like USB devices or monitors), try disconnecting them and connect only the eGPU to your Mac. Some devices connected to the eGPU might cause conflicts, preventing it from being recognized by macOS.

Step 5: Reset the SMC (System Management Controller)

Resetting the SMC can help resolve issues related to power management and hardware recognition, including eGPU issues. Here's how to do it for different Mac models:

  • For MacBooks with a T2 Security Chip or Intel-based MacBooks (2018 models and later):

    1. Shut down your MacBook.
    2. Press and hold the Control (left side) + Option (left side) + Shift (right side) keys for 7 seconds.
    3. While still holding those keys, press and hold the power button for another 7 seconds.
    4. Release all the keys, wait a few seconds, then turn on your MacBook by pressing the power button.

  • For iMac, Mac mini, Mac Pro:

    1. Turn off your Mac.
    2. Unplug the power cord.
    3. Wait 15 seconds, then plug the power cord back in.
    4. Wait 5 seconds, then turn on your Mac.

Step 6: Use Activity Monitor

Sometimes, software running in the background might be causing the issue. You can use the Activity Monitor to quit any processes that might be interfering with the eGPU:

  1. Go to Applications > Utilities > Activity Monitor.
  2. Look for any suspicious or unnecessary processes that might be causing a conflict.
  3. Select the process and click the "X" button on the top left to quit the process.

Step 7: Reach out for Support

If none of the above steps work, it might be time to seek professional help. Contact Apple Support or your eGPU's manufacturer for further assistance. They might have more specific solutions for your model.

Conclusion

While encountering the 'Cannot Use External GPU' message can be disheartening, remember that most issues have solutions. By methodically working through these troubleshooting steps, you're well on your way to unleashing the full potential of your Mac with an external GPU. Whether it's for gaming, graphic design, or video editing, an eGPU can significantly enhance your macOS experience – once it decides to cooperate, that is!

Remember, patience is key. Take each step one at a time, and with a bit of luck, you'll have your eGPU enhancing your Mac's performance in no time. Happy computing!

Footnote

Always ensure that you back up your data before performing operations such as SMC resets, as a precaution against unexpected issues.