have u done 12v fan modd + air duct tunnel by rbjtech?? if not yet, do that...it will bring a lot of difference....x-clamp only improve heat transfer from cpu to heatsink...
without proper air ventilation, sooner or later will get 3rod again.

i've done mine today....the result is unbelieveble.....before modd i measure the temperature at the lower case directly under gpu,
it was 46 celcius...after modded 29 celcius...hard to believe. but maybe it was due to the room temperature, i set my room a-cond(in office)
to the max and the temperature sensor i used read 19 degree celcius.