Apparently my card(s) doesn't support it I have never been able to use it although I have checked the box to unlock it. Unless someone with the same card can correct me on that. I might check out trixx. I really like that Afb will put a GPU temp reading in the systray as I can see the temp at a glance by remoting into the machine without having to interact with the desktop.
I have found that trixx is much more reliable then afterburner but I feel the same way about the temp monitoring. My solution was to overclock with trixx monitor my temps with afterburner.