I couldn't find an explicit statement in the BKDG but almost everything I read was consistent with address bits 0-2 corresponding to bytes within a 64-bit chunk going out on the memory bus.
That said, there was one statement about interleaving even and odd bits in section 2.9.6 (DRAM Data Burst Mapping) which I didn't fully understand (it talks about even/odd bits but also about mapping them to 64-bit quadwords) that might be an exception but not sure.
http://support.amd.com/TechDocs/49125_15h_Models_30h-3Fh_BKDG.pdf
JB
