@sheila5 I was looking info on the internet on your video card because I remembered Pablo saying some video cards are having problems in Blender, but I think it had to do with 2.8. But I assume you are rendering in 2.79b?
But 1 hour of render time with a CPU for one of those scenes is quite good. That’s what my laptop hits with the CPU, with the GPU it was down to 25 minutes. Kent super Linux Luke computer was doing 45 minutes on the CPU and 6 minutes on the GPU I think it was, if I remember correctly.
Neither the Toyota scene or this black car one would do 15 minutes on the CPU I guess, that’s some GPU power there.
The Center rendering thing makes no difference at all, that just decides the direction of the render buckets.
The only mistery remaning is why your GPU is grayed out. Do you have any other version of Blender installed? like 2.78 or something and see if that one recognizes your video card?
