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PCs, How to Apply Thermal Paste Correctly

Thermal paste is essential for transferring heat between your CPU and cooler. Applying it correctly ensures efficient cooling and prevents overheating. In this guide, you’ll learn how to apply thermal paste properly during a new build or when replacing a cooler.

Step 1: What Is Thermal Paste?

Thermal paste (or thermal compound) fills microscopic gaps between the CPU and cooler surface, improving heat transfer. It's applied only on the top of the CPU heat spreader (IHS).

Step 2: When to Apply Thermal Paste

  • Installing a new CPU cooler
  • Reapplying after cleaning or upgrading
  • Replacing a pre-applied thermal pad

Step 3: What You Need

  • Thermal paste (non-conductive is safest for beginners)
  • Paper towels or microfiber cloth
  • Isopropyl alcohol (90%+ recommended)
  • Plastic card or applicator (optional)

Step 4: Clean the Surfaces

Before applying new paste:

  • Clean old thermal paste from the CPU and cooler using isopropyl alcohol.
  • Wipe gently with a lint-free cloth until both surfaces are shiny and residue-free.

Step 5: Apply the Thermal Paste

Most common method: A small pea-sized dot (about 4–5mm wide) in the center of the CPU.

  • Other valid methods: X-shape, line, or spread (only if using a card).
  • Don't use too much — it can spill over and reduce effectiveness.

Step 6: Mount the Cooler

  • Carefully lower the cooler straight onto the CPU.
  • Apply even pressure and secure it with screws or clips.
  • Do NOT lift and reseat after applying paste — this can introduce air bubbles.

Step 7: Test Temperatures

  • Boot into BIOS or OS.
  • Use tools like HWMonitor, Core Temp, or Ryzen Master to check idle and load temps.
  • Reapply paste only if temps are unusually high (e.g., >90°C under load).

Tips and Mistakes to Avoid

  • Don’t spread the paste with your finger — it introduces contaminants.
  • Don’t use metal-based paste if you're new (can short circuits if spilled).
  • Reapply paste every 1–2 years for optimal performance.

Next Steps

With thermal paste applied correctly, your CPU can now run cool and stable — especially under heavy loads or during overclocking. Enjoy a quieter and more efficient system!