While the naming might indicate that this is a Bulld0zer-based chip, AMD's FX-4130 is apparently based on Piledriver and comes from the Vishera family. Compared to the FX-4100, it boasts a 200MHz boost in stock clocks and will Turbo boost all cores to 3.9GHz when under load, should you leave that option on. It does have half the cache of the FX-4100, but does ship with a better stock cooler, the same one found shipped with the FX-8350. AMD has sent out a skewed graph together with their press release and it promises performance improvements in the range of 3-9%.