Bristol Ridge or Stoney Ridge, respectively, is the code name for the 7th generation of A-series APUs and the successor to the Carrizo and Carrizo-L APUs. Even though nothing changed in terms of transistors, there is significant progress thanks to numerous activated features, optimizations as well as an adjusted manufacturing process.
http://www.notebookcheck.net/AMD-s-Bristol-Ridge-and-Stoney-Ridge-Architecture.169746.0.html