Arashflash44 :
benjii :
They come with thermal paste already applied.
huh???it come with thermal paste already...but how often to change it
All graphics cards come with thermal paste already applied. For a card like that, there's no need to change it at all. In saying that though, after 2 or 3 years you might see slightly better performance if its replaced.
If it's overheating, have you checked that there's good airflow and that it's dust free?