The iMac Pro's CPU is upgradable, but documentation on this seems scarce. I found out that the top end 18-core CPU is a Xeon W-2195. Which other CPUs are supported? I could try to find which Xeon-W CPUs fit the Specs given by Apple, but I'd rather be certain. Is there a list, or can someone who has an iMac Pro at least tell me the model number of their CPU?
Update: A slightly modified Xeon W-2145 known as "2140B" seems to be the 8-core base model which has recently been canceled.