ATITrayTools - found under the Hardware Tab. You can set it to monitor all sorts of things from your AMD/ATI GPU ......... I love the flexiblity of the graphs. As you can see by my examples - you can control X axis (time) and Y axis (measurement value) independently - which allows you see all sorts of interactions.
Anyway, here's a link to guru3d
http://www.guru3d.com/article/ati-tray-tools-/
Oh yes, another benie.... it's free
S!
Gunny