So my specs are a i7-6700k CPU, 32GB of memory, and 2 980 Ti's running on Windows 10. I ran the benchmark multiple times with different settings and here are the results. The DirectX 12 tests are with SLI turned off and using the multi-GPU option in the game settings and the DirectX 11 tested are with SLI turned on. All tests were done with Shadowplay and the Steam overlay turned off.
DirectX 12 - Fullscreen - 1 GPU - High Settings - 32.7 fps average.
DirectX 12 - Fullscreen - 2 GPUs - High Settings - 33.1 fps average.
DirectX 12 - Borderless Windowed - 1 GPU - High Settings - 52.1 fps average.
DirectX 12 - Borderless Windowed - 2 GPUs - High Settings - 52.0 fps average.
DirectX 11 - Fullscreen - 1 GPU - High Settings - 68.7 fps average.
DirectX 11 - Fullscreen - 2 GPUs(SLI) - High Settings - 70.1 fps average.
DirectX 11 - Borderless Windowed - 1 GPU - High Settings - 68.0 fps average.
DirectX 11 - Borderless Windowed - 2 GPU(SLI) - High Settings - Crashed