Cycles render on combination of AMD & Nvidia GPUs in one system System Spec:


Intel i5-3470 
AMD R9 290
Nvidia GTX 460


Blender 2.76 (and tested on 2.77 RC2) does not support smoke &amp; fire rendering on AMD GPU. Rendering the animation on my CPU takes too much time. 

My proposed solution is to install an existing Nvidia GTX 460, then hack both GPUs with Hybrid Physx. 

Does anyone tried this method or would it work?
What are your feedback and suggestions? 

I am not be able to upgrade my PC in the near future.
Blend file: 2.7x Cycles benchmark (Updated BMW)

Forum post




Testing Methodology:


Load up the .blend file.
Set the "Compute Device" to "OpenCL".
Render twice on AMD R9 290. Record the lowest value.
Set the "Compute Device" to "CUDA".
Render twice on NVidia GTX 460. Record the lowest value.




Results:


AMD R9 290 (OpenCL): 1:43:57
NVidia GTX 460 (CUDA): 3:33:95


Blender cannot use both OpenCL and CUDA simultaneously.