Some things of note from the teardown are as follows:
The iMac Pro features a massive dual fan cooler to help keep the CPU and GPU cool. Notably, the iMac Pro is remarkably quiet, even when performing intense operations that would normally cause the 5K iMac to sound like a jet preparing ready for takeoff.
As previously noted, the iMac Pro uses standard 288-pin RAM sticks, which can technically be user-replaced, but are much more difficult to access. Apple says that you can upgrade the RAM but it’ll need to be done by authorized repair personnel. We were able to perform the RAM upgrade itself, maxing out the machine with four 32GB sticks of RAM for a total of 128GB.
After continuing the teardown : the GPU is soldered down to the logic board, meaning that it’s non-upgradable for adventurous iMac Pro owners. The good news is that the CPU is not soldered down, meaning that it may be able to be upgraded. We noted that the CPU appears to be custom silicon provided by Intel, instead of an off-the-shelf Intel Xeon W class chip.
The teardown also confirms that the display is the same 5K display found in the 2017 5K iMac. That means there are no screen enhancements for the iMac Pro, which may be a bit disappointing for users looking for something brighter than the 500 nit-rated LG manufactured unit.
Unsurprisingly, the iMac Pro gets a low repairability score of 3. That said, it’s still possible to upgrade the RAM, and it may even be possible to upgrade the CPU and SSDs in the future. Unfortunately the GPU is soldered into place, but with Thunderbolt 3-enabled GPUs, that becomes less of an issue.