I have a question that I need some help on. I cannot seem to find a straight answer anywhere. Hopefully someone here can help me out. If you remove the heat sink from the cpu for any reason, do you have to reapply the thermal paste every time you reassemble the heat sink back? Lets suppose a fresh thermal paste is applied and the heat sink is installed. After 4-5 months, if for some reason you need to remove the heat sink, do you have to clean the old thermal paste and apply a new one? Does separating the heat sink from the cpu, cause the existing paste to not perform as well as before?