Those temps looks fine to me
There's nothing to worry:)
80c at full load is quite decent for a 8800Ultra!! (They were meant to run hot!!)
In case you wanna compare temps then my 9800GT goes upto 88C while gaming(modern warfare 2 for now
and My E7300 goes upto 55c ...
But even that's fine dude
You need to worry when CPU goes 65+ and GPU over 95c