^^
which is what I thought too, but it doesn't mean to say that the OP's not going to want to add more or get something more overclockable in the future.
I will always praise AMD for having backwardly-compatible processors as it does save some cash in upgrading systems, but in some case I think you should just go for a whole new build.
If the OP already had a AM2+ motherboard and was just looking for a CPU upgrade then that's fine. In this case though the OP is buying a new board in order to use the new CPU, so to intentionally buy into an obsolete socket that won't allow the processor to run at full performance just to save $50 on RAM seems a little silly.
Just my opinion.