Here I bring the Apple iMac 27 inches "4K, The internal power of the iMac is transformed into incredible images Thanks to the powerful Radeon Pro 500 series graphics processor, every work day is a show.
This is the link of the page; https://www.apple.com/la/imac/.
The 27-inch iMac with Retina 5K display has up to 8 GB of dedicated VRAM, and the 21.5-inch iMac with Retina 4K display brings up to 4 GB. With both you will enjoy visual effects and stunning 3D graphics. In addition, you can perform advanced video editing tasks, such as working on Final Cut Pro X Multicam projects with up to five 4K video sequences of maximum resolution.
Besides these models are faster than ever with: the 27-inch model reaches speeds of up to 4.2 GHz, and the model of 21.5 inches, up to 3.6 GHz, The ability to be fast and smart.
Storage is a matter of space, but also of speed. And Fusion Drive offers you the best of both worlds. In addition, Fusion Drive now comes in all 27-inch models and in the superior configuration of the 21.5-inch model. It also has, with 1,000 million colors and 500 nits of brightness, the graphics have an extraordinary definition.