tiny voices said:
Honestly, it will not help. The paste on your card is fine. I promise.
I don't think so.. using a good Arctic Silver 5 or something that's a good thermal paste will actually improve temps..
maybe this thread here will help..http://www.tomshardware.com/forum/307418-28-best-thermal-compound
However, I suggest against it as it might void your warranty and the results may not be what you think it is in real world as very few people did it and it might be dangerous also..
Anyways, if you are doing it, make sure you use a isopropyl alcohol and use a cotton swab to clean the thermal paste off the surface.. you can try using the 'pea' method as it will leave little or no air gaps.. air is not a good conductor of heat..
Do post your results.. it will help someone i'm sure..