You missed out on the last conversation about this. What prevents the GMA X 3100 or X4500 from taking advantage of this?"OpenCL
Another powerful Snow Leopard technology, OpenCL (Open Computing Language), makes it possible for developers to efficiently tap the vast gigaflops of computing power currently locked up in the graphics processing unit (GPU). With GPUs approaching processing speeds of a trillion operations per second, they’re capable of considerably more than just drawing pictures. OpenCL takes that power and redirects it for general-purpose computing."
http://www.apple.com/macosx/snowleopard/