Recently, word went around that the only way to get 256GB of RAM in an iMac Pro was at the factory. OWC paid no attention to that, and is now offering to upgrade this powerful desktop to the maximum amount. Even better, its 256GB of RAM modules go for 52 percent less than the cost to have the same upgrade done by Apple.
Upgrading this desktop to 128GB of RAM with OWC DDR4 Kits is also significantly cheaper.