blender cant find gpu for cycles

im running a amd a-series cpu gpu combo and im trying to run blender through the gpu. when i look in user prefrences it dosent show up. is it running it allready? how can i tell the cycles renders prety fast but im not sure if thats just the cpu doing it.

You would need a NVidia card for gpu rendering as they are the only ones to support CUDA

yes thats true but there is also openCL for AMD/ATI

I don’t think Blender has support for that yet only CUDA

Read here for OpenCL status http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles/OpenCL

OpenCL support for AMD/NVidia GPU rendering is currently on hold.