Should I still apply Thermal compound to a CPU that i'm using again?
I'm going to be putting the same CPU and the same fan onto a new motherboard. Is there any need to clean the existing thermal paste off? or could I just keep it on?
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Clean it off and re-apply.... If you take the fan off then put it back on while leaving the same paste you will get a lot of air bubbles and your temps will increase a fair amount... Just clean it off and put new thermal compound on it.
it would be best to clean the old stuff on and put on a new layer, if only to make sure there's no air bubbles / air pockets when you stick the heat sink onto the processor.
thermal goop is like $5, a processor is well over $100. spend the fiver.