GPU x CPU, why should I use GPU render on cycles?

Support Lighting and Rendering
1

I´m playing with my options here, I have in one corner an i7 3820 lga 2011 and on the other corner a GTX 660 ti, fight!

The results I had by trying to render the same scene on both of them is weird, I´m having quicker renderizations on CPU render than GPU render, wich is weird, I use Octane and I have ultra fast renderizations with it, far more fast than CPU rendering, so, this is it? Cycles GPU rendering is slower than CPU rendering?

2

Have you confirmed you are actually using the gpu for rendering ?
Latest drivers ?
blender version ?
What is your test scene

3

Yes, its enabled on user settings and on the render panel.

I have the latest driver of my graphic card and Im using blender 2.66.

I m rendering a project and it´s not a test scene, actually is a very big scene 3 000 000 polygons, but I m having slowr times with GPU.

4

Ok, thanks guys, Im probably wrong about it, maybe something happened when I was rendering with the GPU.

Anyway, thanks for your time and for your help!