Replacing a thermal paste on your CPU is a process that should be carried out whenever you feel the cooling system isn’t functioning as it should be, while you don’t see any kind of mechanical defect or delinquency in the cooler itself.
In this case, the main culprit is the old dried thermal paste, and it’s the time to remove and apply a new fresh one instead.
This video explains to you how to remove it and make your CPU and heatsink absolutely clean for a new thermal paste application.
Make sure to pick the right thermal paste that your processor deserves. If you have a high-end processor that often undergoes heavy workloads that require huge heat emission during processing time, then you have to consider opting for a high-end thermal paste that performs so well in this situation.