RealWorldTech discusses AMD's Llano, you can read it over here.
At Hot Chips, AMD gave a presentation that delved into Llano, the first
mainstream Fusion product. There were new details and results for their
power management system, that were much more comprehensive than the
information at product launch.
Previous disclosures painted a poor picture of the power management, which
is far from the truth. Given the older CPU and GPU designs and
time-to-market pressure, the results are quite good. Llano's power
management focuses on the most important aspects - sharing the power and
thermal headroom between the GPU and CPU, and overcomes several significant
challenges. The result is modest performance gains for Llano and a solid
foundation for future generations that will be much more power aware and
optimized, and thus yield greater benefits.