I started testing several games on the new Retina iMac right away. I will be using it for work, but maybe I want to use it for gaming too! And I want to see if the games can hang at 5k. So I should test it! I love testing computers anyway. I made one video using my iPhone, but I an actually screen captured some games at 5K and it doesn’t hurt the FPS too much.
World of Warcraft, DOTA 2 (Defenders of the Ancients), Minecraft using iPhone
Minecraft in 5K
Starcraft II in 5k iMac
Retina iMac 5k and Diablo 3
World of Warcraft fly through Jade Forest in several resolutions on 2014 Retina iMac
Eve Online Gaming in 5k and more on the new iMac
In the end the iMac 5k is a very formidable gaming machine that can edit and encode videos like lightning. This one does have the i7 processor and the Radeon m295x video card. It also has 16GB Ram. Those probably help.