Apple has updated the iMac Pro build-to-order options. You can add a Radeon Pro Vega 64X graphics and a 256GB RAM option. The 256GB RAM memory option costs $5200. And that’s on top of the $5000 starting price of the pro all-in-one. However, the Radeon Pro Vega 64X graphics card is less pricey. It’s “only” a $700 upgrade, and comes with 16GB dedicated video memory.