Cycles Time (GTX790)

Surprisingly, I’ve got the best time (1:18) when the image was split to 16 tiles 480x270 (1920/4, 1080/4)

Complete info:

CPU: Intel i7 3.4Ghz
GPU: Nvidia GTX 790
OS: Windows 10 64bit

Time: 1:51 GPU - CUDA, Tiles 128x128, 1920x1080 px, 50%
Time: 1:25 GPU - CUDA, Tiles 256x256, 1920x1080 px, 50%
Time: 1:21 GPU - CUDA, Tiles 512x512, 1920x1080 px, 50%
Time: 1:32 GPU - CUDA, Tiles 1920x1080, 1920x1080 px, 50%
Time: 1:18 GPU - CUDA, Tiles 480x270, 1920x1080 px, 50%
Time: 1:23 GPU - CUDA, Auto Tiles 240x180, 1920x1080 px, 50%
Time: 1:32 GPU - CUDA, Auto Tiles 960x540, 1920x1080 px, 50%

Time: 4:57 CPU, Tiles 480x270, 1920x1080 px, 50%
Time: 3:04 CPU, Tiles 64x64, 1920x1080 px, 50%
Time: 2:58 CPU, Auto Tiles (32x32), 1920x1080 px, 50%

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