ATI Radeon HD 7770 no GPU rendering? So I don't have an option to turn on GPU rendering in settings. I only have the option for CPU rendering.
Here's my specs:


ATI Radeon HD 7770 1GB  GDDR5 1GH
AMD Phenom II 4x 960T 3GHz
4Gb DDR3 1600MHz RAM


My GPU driver is version 13.9.
I see people running fine with this GPU, but for some reason I don't have an option to turn it on.

I need to deliver my design tomorrow so I need this fast and CPU just can't render it that fast.

I'm running Blender 2.69 on Windows 8.1.
OpenCL isn't fully supported yet (which is what AMD/ATI cards use to render):


  Cycles has two GPU rendering modes: through CUDA, which is the
  preferred method for NVidia graphics cards; and OpenCL, which is
  intended to support rendering on AMD/ATI graphics cards. The
  implementation of OpenCL is only in an experimental stage and disabled
  in official builds. (source)


You could try to find a build on GraphicAll, but there is no guarantee it'll work.

I would recommend just rendering it on CPU. If you are really pressed for time, there are a few things you can do to speed things up:


Set the size of the tiles lower (Render Tab > Performance). The CPU renders faster if the tiles are smaller (GPU renders faster on bigger tiles).
Set the threads to fixed and set them as high as possible (Render Tab > Performance). This will make Blender use more threads which will speed up the render.
Turn the samples down. It's fairly easy to remove a few fireflies later on in compositing, and will speed up your render time a lot.