Hi there,
if you have any concerns over such things as NB temps then the best advice would be to RMA the board, epsecially as you have just got hold of it. said
Without knowing your full system spec's it's hard to say though, if this is a major problem or just the usual bedding down process. When I first took delivery of my GA-990FXA-UD5 I noticed some odd smells, that like you I couldn't quite describe, but they soon passed and everything has been running fine since. I guess the heat from actually running the board was just burning off some of the residue chemicals.