Aren't they AM3+? From what I've heard, the AM3+ boards should allow AM2+ processors, however the AM3+ processors shouldn't be friendly with the AM2+ boards. Could be the other way around. I'll take a look.
edit: It is as you've stated Cabbs. AM3+ will be able to take advantage of AM2+ motherboards. However, AM2+ processors will not be able to do the same to AM3+ motherboards because the lack the DDR3 support.