I run SLI and all I do is run two instances of the Gadget and set one to each card....
47c would be good temp for idle, but if thats showing for load temp then yes its wrong.
It might be because of it being a mobile card, I'm not sure as I do not have one....
You could try this one....GPU Observer Gadget | Windows 7 Gadgets:
Ok these are NOT Gadgets but might work...You could look them up and try them
Ati Tray Tools
I also do NOT know if they work with Mobile GPU's
Good Luck and sorry I could not be much help.