My time (Normal Settings):
CPU: Intel i7-4790 3.6Ghz
GPU: Nvidia GTX 960
OS: Windows 10 64bit
Time: 2 min 32 seconds (GPU - CUDA)
Time: 3 min 47 seconds (CPU)
CPU
My Time (8 tiles)
Time: 3 min 32 seconds (CPU)
GPU - CUDA)
My Time (540 tiles)
Time: 2 min 1 second