That chart is complete rubbish.
It's a comparative chart; stressing the cards to show differences between them with most settings turned up to 11. Why is it rubbish?
Edit: "For our benchmarks, we have selected a very challenging scene, we ride our horse roach in tight gallop through a meandering forest path. Here the now elaborate lighting and shading of vegetation as well as their level of detail proposed by particularly strong. Two of us fleeing deer herds provide additional load, also is short a pond with tessellierter water surface in the image. But it is not specifically a worst-case benchmark."
http://www.pcgameshardware.de/The-Witcher-3-PC-237266/Specials/Grafikkarten-Benchmarks-1159196/