Chosen Solution
I have a 2014 5K iMac, and while it’s working fine, I’m out of SSD space, so looking to upgrade it. While in there, I was thinking of going to a faster logic board - the 2017 uses faster RAM, has faster CPU, and has 4 PCIe lanes so can run the SSD at 4x (over 2GB/s) vs. mine which is maxed out just over 500MB/sec. Will a 2017 (or 2015) logic board fit and drive the display?
Wow! A lot of change and cost for the slight improvement you would get. The cheaper direction would be to buy a new system (new or even used). Don’t forget the 2017 model boards and faster x4 blade SSD’s are being sold at a premium! You won’t get the brighter (NITS) display the newer model has or TrueTone either. Frankly, I don’t even know if the older display would even work with the newer logic board or if all of the connections & mounts are the same.
