Hello,
So, I run a MSI 6QD dominator GT72, and a GTX 970m; my rendering times for for cycles are the following:
GPU for a 50% res (128x128 tiles): 3’20"
GPU for a 50% res (514x514 tiles): 2’54"
CPU for a 50% res (514x514 tiles): 19’43"
I didn’t run a second on CPU because I felt it was going for a long run 