This video is from AMD and was posted on the OcUK forums:
http://www.youtube.com/watch?v=mdPi4...layer_embedded
The AMD system used the HD6620M IGP. Considering that the desktop HD6670 uses 480 stream processors this probably indicates the quad core Llano CPU uses 480 shaders too. The mobile HD6570M uses 400 stream processors.
Edit!!
The details of the test system are at 2 minutes and 31 seconds into the video.