I said upgradable, not slotted. And no, having to remove the display and void the warranty isn't "upgradable" for a mainstream user. And this model (which is 5k, not 4k) has a memory door on the back and Apple lists the model as user accessible. That's my whole point, when the "consumer" 5k 27 inch has a memory door, why not do the same on the "pro" model? https://support.apple.com/en-us/HT201191#install1 --- Post Merged, Jun 13, 2017 --- That's not the iMac pro (which doesn't ship for months), that's the 2017 21 inch iMac.