My GPU did better than the CPU
GPU: Nvidia GTX 980M
best time: 1 min 33 sec
tiles: 512 x 512
CPU: Intel i7 2.7 Ghz
best time: 4 min 29 sec
tiles: 32 x 32
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My GPU was better as well, CPU couldn’t keep up at all 
GPU: GTX 980Ti
Time 1 min 7.23 sec
tiles: 480x540
CPU i5 3.2 Ghz
bet time: 2 min+ (ended render after 2 min)