https://motherboard.vice.com/en_us/article/9kpj83/imac-pro-upgrade-ram-now-costs-15927

Apple recently updated the upgrade options for the iMac Pro, and getting the very best will cost you. A baseline model will cost you just under $5,000, and maxing out the hardware to absurd heights runs a whopping $15,927.

The most expensive possible upgrade is a $5,200 charge for upgrading the RAM from 32GB to a startling 256GB. Other addons include an additional $700 for a 16GB Radeon video card and $2,400 for a 2.3 Ghz Intel processor with 18 cores.