Half the thermal paste content online is people arguing over patterns: pea, X, line, spiral, ten dots. The truth is most patterns work, the differences are tiny, and the things that actually matter — surface cleanliness, paste amount, and cooler mounting pressure — are what separate good results from bad. Here’s the practical guide.

When you need to apply paste

  • Building a new PC with a fresh CPU and cooler.
  • Replacing your CPU cooler.
  • Repasting an aging system that’s running warmer than it used to.
  • After any time you remove and reseat the cooler.

You don’t need to repaste on a yearly schedule. Most quality pastes last 3-5 years before drying out enough to matter.

What you need

  • A syringe of thermal paste (the small tube that came with your cooler is usually fine).
  • 90%+ isopropyl alcohol.
  • Lint-free cloth or coffee filters (paper towels leave fibers).
  • Patience for 5 minutes of careful work.

If you’re repasting: clean off the old stuff first

This is the most overlooked step. New paste over old paste is worse than fresh paste alone.

  1. Power down the PC, unplug it, wait a minute for capacitors.
  2. Remove the CPU cooler. Twist gently if it sticks — old paste can be tacky.
  3. Look at the CPU and the cooler base. Both will have old paste smeared on them.
  4. Wipe most of the paste off both surfaces with the lint-free cloth.
  5. Apply a small amount of isopropyl alcohol to a clean part of the cloth.
  6. Wipe the CPU and cooler base until they’re clean and shiny.
  7. Let both dry completely (alcohol evaporates in 30 seconds).

Don’t pour alcohol directly on the CPU. Don’t let it run into the socket. Apply to the cloth first.

The pea method (works for almost everyone)

This is the default for a reason: it’s easy, repeatable, and works with virtually every CPU + cooler combination.

  1. Hold the paste tube vertically over the center of the CPU.
  2. Squeeze out a blob about the size of a small green pea, or a grain of rice. Half-pea is fine for smaller CPUs.
  3. That’s it. Don’t spread it.
  4. Mount the cooler straight down — no twisting — and apply screw pressure evenly in a cross pattern.

The cooler’s pressure spreads the paste outward across the CPU. As long as the blob is roughly centered and the cooler mounts evenly, you’ll get good coverage.

The X / cross method

Some people prefer this on larger CPUs (like Intel’s flagship parts or AMD Threadripper):

  1. Apply two thin lines forming an X across the center of the CPU.
  2. Each arm of the X should reach about 80% of the way to the corners.
  3. Mount the cooler.

This gives more reliable corner coverage on rectangular CPUs.

The spread method (advanced)

If you want to verify the pattern visually before mounting:

  1. Apply a small dot in the center.
  2. Use a plastic spreader (often included with paste) or an old credit card.
  3. Spread the paste in a thin, even layer over the CPU surface, covering everything edge to edge.
  4. Aim for a coat thin enough that you can almost see the metal through it.
  5. Mount the cooler.

This is more time-consuming but produces predictable results. Useful with paste that’s too thick to spread under cooler pressure alone.