Massman, at first I thought there was something wrong with this score as well as I have seen many bugged scores getting posted, but since it's only hitting 5ns lower latency then normal I don't think it's bugged, but of course it could be some new kind of bug.
Maybe it's due to the NV chipset?
I can only comment on Intel chipsets but they are hitting lower latencies as well, check Vendetta's DDR2 score for example.
However, I did not expect the chipset on AMD to create such a big difference in MaxxMem.