How to Apply Thermal Paste to CPU? The Correct Way
Importance and Function of Thermal Grease
As the main processing component of a computer, the CPU produces significant heat that must be managed efficiently. Thermal grease allows this heat to be transferred quickly from the CPU to the heat sink. Without proper cooling, overheating can cause system instability, data loss, or permanent damage. Therefore, applying thermal grease between the CPU and GPU is essential during cooling fan installation.
Thermal grease fills microscopic surface imperfections and improves physical contact between the CPU and heat sink. Its adhesive nature also helps maintain stable contact even when mounting pressure decreases over time.
Relationship Between Grease Thickness and Cooling Efficiency
A thinner thermal grease layer provides better thermal performance, provided it fills all surface gaps. Excessive thickness increases thermal resistance and reduces heat dissipation efficiency.
Thermal Grease Application Techniques
Although no universal standard exists, proper application requires even coverage, minimal thickness, and a clean, bubble-free surface. One technique uses a central dot of grease spread naturally by heat sink pressure, suitable for smaller chips. Another technique manually spreads the grease, which is better for larger CPUs or GPUs but requires careful handling.
Learning how to apply thermal paste to cpu properly ensures consistent heat transfer and system reliability.
Step-by-Step SOP
- Clean the CPU and heat sink base using acetone and a lint-free cloth. Avoid finger contact. Alcohol may be used if acetone is unavailable.
- Apply a small amount of thermal grease to the center of the heat sink contact area.
- Use a plastic-covered finger to spread the grease evenly across the base.
- Remove excess grease and confirm even surface coverage.
- Place a small amount of grease at one corner of the CPU core using a clean tool.
- Spread the grease evenly across the entire CPU core to a paper-thin layer.
- Gently install the heat sink without shifting or twisting.
Thermal Grease Lifespan
Thermal grease is stable and non-volatile. Under normal conditions, it does not require replacement for two to three years unless the heat sink becomes loose.
