CUDA Devices not showing up in "Render" tab (v. 2.78) I've gone into user settings > system and enabled both of my SLI GPUs for compute devices, however, as per the instructions, there is no "Device" drop-down to select a device in the render tab. 

I have the newest version of CUDA as well as up-to-date GPU drivers. Do I need to install/configure blender for specific GPU support to enable this?
Switch to the cycles render engine:

On the info window



Select Cycles Render



and enable GPU Compute Device: