Hey hey.
Read your query on the shoutbox.
Easy there with the card.
no. 1 suggestion, do not use it before you replace the thermal paste.
First off, which card is it?
Secondly, buy 125 wali Cooler Master ki thermal paste. Great paste in a great price.
Apply it very very little. Tiny amount, less than pea size. Secondly, make sure you take off all the old goo and paste using alcohol based solvents. Nailpolish removers and perfumes will do just fine.
Make sure you dont over apply.
Make sure you clean your heatsink using a blower and cloth to remove unwanted dust.
Enjoy