"There is a strong correlation between thermal performance and the amount of pressure holding the heatsink to the CPU. The most efficient thermal grease available will perform poorly if the bond line interface (the thickness of the thermal grease between the heatsink and CPU) is too thick."
"As a continuation of work to better understand the dynamics impacting thermal grease performance, tests were conducted by users in four different forums using contact pressure sensor from Sensor Products to evaluate why some users saw marked improvements in heatsink performance..."
FULL STORY @
OVERCLOCKERS (http://www.overclockers.com/heatsink-mounting-pressure-vs-performance/)
