Watch Dogs 2, Prey, Dirt 4
Watch Dogs 2 is a heavy CPU user and here the 7800X is able to roughly match the 7700K, not something we have seen in all CPU intensive games.
Like a lot of the games tested Prey isn't too demanding on the CPU, this one will play perfectly smooth on the Pentium G4560 for example. So no surprise the 7800X keeps pace with the 7700K here.
Finally we have Dirt 4 and this isn't a title I expected the 7800X to fall behind in but once again it has. Here the 7700K was 15% faster out of the box and we see another example where overclocking the 7800X doesn't really improve performance.