I purchased a retail Athlon64 FX-53 939. I had to remove it from the motherboard and I will have to put it on another motherboard. I pulled the heatsink off and then the processor per the instructions. I have some Arctic Silver left over. Am I supposed to scrape off that thermal pad put in the arctic silver and do it that way or am I supposed to just reattach the heatsink over the processor with the thermal pad that is already there? Thanks