Cycles compute device for rendering is GPU but actually CPU get's used I'm trying to render with gpu in cycles render but, even tho looking at the settings it seems like everything should be fine , actually looking at cpu and gpu usage i noticed that the one actually being used for rendering was still the cpu.



my cpu model is Intel(R) Core(TM) i5-3550 CPU @ 3.30GHz

my gpu model is GeForce GTX 1080

my CUDA version is 8.0.61

can someone help me figure out why is this happening? 
thank you :)
solved it.. in the end looks like there were some leftovers from older versions of the nvidia drivers that were causing conflict because i wiped clean the pc and reinstalled the drivers and now gpu rendering works as it should.