@violentlyhappy91 and Leaps-from-Shadows: I should've been more specific in the OP. It is running in A2,B2 (blue slots) which is what the RTFM recommends.
I also grabbed another tool (AIDA64, which used to be Everest) and it lists the clock and effective clock (which is double, and I take it to mean "dual channel").
@joytech22: No, I don't benchmark (except for idle curiosity). I just want it to be as stable and fast as I can make it ("as I can afford to make it"
). I wasn't sure I was getting all that the RAM could give me, and as there are other choices with higher clocks and XMP profiles, I wanted to be sure.