Apple iMac with Retina 4K display - All-in-one - Core i5 3 GHz - RAM 8 GB - HDD 1 TB - Radeon Pro 555 - GigE - WLAN: 802.11a/b/g/n/ac, Bluetooth 4.2 -
Amazon.com: AMD Radeon PRO WX 3200 4GB : Electronics
AMD Radeon PRO on Twitter: "Ideal for #VR content creation, the Radeon Pro 570, 575 and 580 will power the new iMac Retina 5K. #WWDC2017 https://t.co/O87aYT3MLu" / Twitter
A1419 iMac 27" Mid 2017 Model 3.4 GHz I5-7500 Logic Board Radeon Pro 570 4GB | eBay
iMac 2017 5k 27 inch Logic Board 3.4GHz 4-Core i5 Radeon Pro 570 4GB | eBay
Apple Genuine 661-03378 Logic Board 3.4GHz i5 Radeon Pro 570 4GB for iMac 27 inch Retina 5K Mid 2017