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Use this video guide to upgrade CPU Core i5 to Core i7 on your iMac 27" Retina 5K Display (Late 2014 & 2015).
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To reassemble your device, follow these instructions.
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To reassemble your device, follow these instructions.
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The method you use to remove the screen is very dangerous but the guide is helpful.
PJVCC - crwdns2934203:0crwdne2934203:0
Good tutorial also useful to replace the SSD blade.
I would not change the processor and leave the creepy fusion drive, but
save the data, split the fusion drive, replace the SSD blade with a decent NVMe SSD (e.g. 512GB) to hold the OS and programs.
You may keep the HDD for your mass data or replace it with a SSD too.
The NVMe blade is however ways faster...
Laszlo Lebrun - crwdns2934203:0crwdne2934203:0