I'm using Blender 2.72 and I want to enable the experimental feature set, which supports OpenCL for my AMD/ATI graphics card (I know what the risks are of doing this). Googling it, I found a Blender Wiki page of 2.6x which said I have to change the feature set to experimental, in the render menu, right under the display options (this is what I'm talking about). However, in my Blender 2.72 I don't have this option:

Could anyone help me to still get the experimental feature set to work?
