"World War Z is an AMD optimized title that makes use of the Vulkan API, which has borrowed many components from the company’s late great Mantle API. All of this means that it makes no surprise to see AMD’s Radeon graphics cards show stellar performance in World War Z. What is genuinely surprising however, is how that impressive performance translates to astonishing leads over the competition." Source Love me some Vulcan goodness! But is the game worth a shit or not?