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Can you upgrade a 27-inch iMac 5K?

Replacing the Fusion Drive with both a SSD and an harddisk

July 30, 2020 -

This month I did an attempt to upgrade my 27-inch iMac 5K. I wanted to replace the fusion drive with a SSD and a large hardisk. In addition I decided this was a good time to upgrade the RAM memory as well, maxing it out at 64GB. I was on a mission to create the ultimate iMac, but things didn't go to plan!

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Today's iMac (in two sizes)
Today's iMac (in two sizes)
YES, it works! The new logic board accepted keyboard input and allowed me to proceed with macOS installation
YES, it works! The new logic board accepted keyboard input and allowed me to proceed with macOS installation
Removing the antenna cables, remember their order using a piece of tape
Removing the antenna cables, remember their order using a piece of tape
After installing the new RAM, I powered on my iMac to see if the new modules worked - they did!
After installing the new RAM, I powered on my iMac to see if the new modules worked - they did!
The SSD drive installed correctly, note how the connector is much deeper in its socket
The SSD drive installed correctly, note how the connector is much deeper in its socket
Oops: the newly installed SSD drive is not correctly fitted in the PCIe slot! An expensive mistake!
Oops: the newly installed SSD drive is not correctly fitted in the PCIe slot! An expensive mistake!

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