I've noticed that after awhile the thermal grease on my CPU and GPU migrate away from the center of the chip and harden into large clumps on the outside of the chip, causing me to constantly clean it up and reapply grease, given it does take a few weeks to do this but I don't feel like I should be reapplying Arctic Silver 5 Thermal Compound every few weeks, just seems like a waste of money and thermal grease.