The X2s do run comparitvely warm. The temperatures of around 80'C that you are experiencing is quite normal, depending on what case you have?
Thing is the X2 cooler tends only to get to about 33% duty even at those temperatures. You could use something like RivaTuner to increase the fan duty - if you
put these things to 100% your temperatures will plummit, as will your ability to hear anything else.