AMD Athlon 64 3500+ 1GHz FSB Model #: ADA3500CGBOX
The CG at the end of the model # is what gives the E4 stepping away. This was originally reported by Anandtech. Someone from the Xtreme Systems forum reported that his was a dud. So it’s hit or miss and more than like what you need in order to get a good overclock is a specific stepping which would be the CABxx stepping.