Thermal paste application

Thermal paste application: technical guide for heat dissipation in processors.

About this subject

Thermal paste is a thermally conductive compound designed to fill microscopic imperfections between the processor (CPU/GPU) and the heatsink. Without it, air gaps act as thermal insulators, dangerously raising temperatures. Most pastes use ceramic, liquid metal, or silicone bases, with thermal conductivity measured in W/mK (watts per meter-Kelvin). Products like Arctic MX-6 or Thermal Grizzly Kryonaut achieve values between 8 and 14 W/mK.

Correct application requires prior surface cleaning with isopropyl alcohol (70% or higher) to remove old paste residues. Common techniques include the rice grain method (a small dot in the center) or uniform spreading with a spatula. The pressure from mounting the cooler naturally spreads the compound, avoiding excess that could leak onto the motherboard.

Periodic reapplication is recommended every 1, 3 years, depending on paste quality and computer usage. Liquid metal pastes offer better conductivity but are electrically conductive, requiring extreme care to avoid short circuits. Ceramic pastes are safer for beginners.

For overclocking enthusiasts, the choice of thermal paste can reduce temperatures by up to 10°C, directly impacting processor stability and lifespan. Brands like Noctua, Cooler Master, and Corsair have extensively tested models. The protective sticker on the heatsink must be removed before installation, a common mistake among beginners.

Frequently Asked Questions

What is the ideal amount of thermal paste to apply?

A grain of rice (about 0.5 to 1 gram) in the center of the processor is sufficient. The cooler's pressure spreads it naturally. Excess can cause leakage or reduce efficiency.

Does expired or dried thermal paste still work?

No. Expired pastes lose conductivity and may even act as insulators. Always check the expiration date and replace dried paste.

Is it safe to use liquid metal thermal paste on CPUs?

Yes, but with caution. Liquid metal is electrically conductive; leaks can damage the motherboard. Only experienced users should use it, sealing nearby contacts with insulating tape.