Is there a render engine with complete GPU support and Blender integration Is there any rendering engine for Blender that only uses the GPU?

I know that Cycles and Luxrender can do this but not all materials work
In gpu mode. So what I am asking is are there any rendering engines which are able to render exclusively on the gpu.
Octane Render is the world’s first GPU based, un-biased, physically based renderer. Octane Render runs exclusively on Nvidia's CUDA technology.

You can check on Wikipedia:

https://en.wikipedia.org/wiki/Octane_Render