Forza Motorsport 7 is the newest addition to the Forza series, available exclusively on Windows 10, in DirectX 12 mode. Because only one API is supported, there is no excuse for poor optimizations due to possible half implementations of DX12. Fortunately, this is not the case with Forza 7. The game runs fine on most hardware, is properly scalable depending on your hardware and above all else is playable by just about anyone thanks to its automatic graphics settings and dynamic resolution. In the results we presented each of the resolutions separately: Full HD (1080p), WQHD (1440p) and Ultra HD (2160p).
Nvidia has higher results at lower settings in the FullHD resolution while AMD comes at the top in the higher settings. Namely, the Vega 64 beats the GTX 1080 Ti at this relatively low resolution. Also at other resolutions we see similar results where Nvidia is better at lower settings and AMD utilises its calculating power better at higher.
The reason AMD is behind on the lower settings seems to be the limitations of the processor. However, with the overclock on the Core i9 7900X, the performance does not improve considerably. Then the problem lies with the driver overhead. This is remarkable given the added value that DirectX 12 could offer. Drawing conclusions from this is difficult due to the small number of DX12 titles at the time of writing to compare to. It is also not unlikely that updates for both Forza 7 and the drivers of AMD and Nvidia will re-shuffle these results in the future.
As we see in many other games, Forza Motorsport 7 does not benefit from a larger number of processor cores. Ten cores with 20 threads do nothing to improve the results, as the game appears to run better even on four cores with Hyperthreading. At the same time, it is encouraging to see that Forza 7 does benefit from 8 threads compared to 4. If that continues to be the trend for the coming years, more than four cores for such games may be of added value. A different trend that we are less happy with, but which we unfortunately see in this game, is the decreasing support for SLI and Crossfire.