Blender 2.79 experimental has combined CPU and GPU render!
The experimental build of Blender now supports combined CPU and GPU render! This is so cool... Its enabled in User Prefs -System. Just click the CPU and GPU boxes and save. Just stared using it and have noticed that you will need to reduce the tile size to accommodate the slower CPU cores, otherwise what happens is the CPU gets stuck on rendering tiles and the GPU's are waiting idle. So i have tried some different tile sizes and got these results on the BMW test from the Blender site. CPU is a i7 4790 GPU 980GTX + 970GTX First how my two gpu's went: GPU's 512 x 256 Tile Size - 1m23s Now combine the cpu and gpu's and reduce tile size: CPU + GPU's 16x16 Tile size - 1m12s Over 10 sec faster.. Nice performance boost! I found the 16x16 tile size to be fastest. Rest of the results after the break