So, I recently swapped motherboards, and when I put everything back together, I just used the same thermal grease that was already present on the heatsink (I have a stock AMD heatsink). Do you think this is ok, or do you think I should put some more on? And if I do put more on, should I scrape the old stuff off first? It seemed to me that most of the surface area of the processor would still be covered, but there may have been a few spotty places around the edges. As long as my temp readings look to be in the right range am I ok?
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Just watch your temps. If they seem to be running too high then clean off and reapply the thermal grease.