Applying thermal paste is a crucial step when building a PC. It ensures efficient heat transfer between the CPU and the cooler, preventing overheating and maintaining optimal performance. However, applying too much or too little can lead to cooling inefficiencies.
In this guide, we’ll cover the correct way to apply thermal paste, the different application methods, and common mistakes to avoid.
1. Why Thermal Paste is Important
Thermal paste fills microscopic gaps between the CPU and the cooler’s base, allowing for better heat dissipation. Without it, air pockets can form, reducing cooling efficiency and potentially causing thermal throttling or system crashes.
2. Types of Thermal Paste
There are three main types of thermal paste:
Metal-Based – Offers excellent conductivity but can be electrically conductive, requiring careful application.
Ceramic-Based – Non-conductive and safe to use, though slightly less effective than metal-based pastes.
Carbon-Based – A balanced option that provides good thermal conductivity while being non-conductive.
3. Preparing for Application
To ensure proper application, follow these steps:
Clean the CPU and cooler surface with isopropyl alcohol (at least 90%) and a lint-free cloth.
Ensure the CPU is properly installed on the motherboard.
Check if your cooler already has pre-applied thermal paste (if so, no need to apply extra).
4. Best Thermal Paste Application Methods
There are several ways to apply thermal paste, but these three methods are the most effective:
Pea-Sized Dot (Recommended)
Apply a small pea-sized drop of paste at the center of the CPU. When the cooler is installed, the paste spreads evenly due to pressure.
Line Method
Draw a thin line of paste along the center of the CPU. This works well for elongated CPUs, such as those from Intel’s Alder Lake series.
X-Shaped Method
Draw an X shape across the CPU’s surface. This method ensures good coverage but may result in excess paste.
5. How to Install the Cooler Properly
Once the paste is applied:
Carefully place the cooler onto the CPU without sliding it.
Press down evenly and secure the mounting screws in a diagonal pattern to distribute pressure evenly.
Avoid removing the cooler after installation unless necessary, as this can create air bubbles in the paste.
6. Common Mistakes to Avoid
Applying Too Much Paste – Excess paste can spill over and cause insulation issues.
Applying Too Little Paste – Insufficient paste leads to poor heat transfer and high temperatures.
Reusing Old Thermal Paste – Always clean off old paste before applying new.
Not Tightening the Cooler Evenly – Uneven pressure can result in poor contact.
7. Checking the Results
To ensure proper thermal performance:
Use HWMonitor or Core Temp to check CPU temperatures.
Run a stress test (e.g., Cinebench, Prime95) and monitor temperature stability.
If temperatures are too high, consider reapplying the paste.
With the thermal paste correctly applied, your CPU will stay cool and perform optimally. Next, we’ll cover how to install a graphics card step by step.