it should be noted that Blender on the X1000 is running with software rendering as full hardware acceleration is currently not available under Debian PPC so the numbers in the graphs will only get better :-)
It should be noted that Blender does not use graphics hardware for any kind of rendering in this test, except to blit the updated graphics to the screen while the rendering progresses.
Blender does have support for OpenCL GPU rendering though, and such results should indeed be significantly better. It wouldn't really help in comparing the CPUs however.