How to Replace Thermal Paste on Your Computer

Published 2026-10-16 · LuxuriousComputers Repair

Your computer is running hotter than it used to. The CPU temperature hits 90 or 95 degrees Celsius under load, the fans run at full speed constantly, the system throttles performance to reduce heat, or it shuts down from overheating. If the CPU cooler is clean (no dust buildup in the heatsink fins) and the cooler fan is spinning normally, the most likely cause is dried-out thermal paste between the CPU and the cooler.

What thermal paste does

Thermal paste (also called thermal compound, thermal grease, or TIM — thermal interface material) fills the microscopic gaps between the CPU's metal heat spreader and the cooler's contact surface. Both surfaces look smooth to the eye, but at a microscopic level they have peaks and valleys. Without thermal paste, only the peaks make contact — the valleys are filled with air, and air is a poor conductor of heat. Thermal paste fills those valleys with a thermally conductive material (typically silicone mixed with metal oxides, ceramic particles, or in high-performance pastes, liquid metal) that transfers heat far more efficiently than air.

Fresh thermal paste is soft and pliable, conforming to both surfaces. Over time — typically 3 to 5 years — the paste dries out, hardens, and cracks. Dried paste loses its ability to fill the microscopic gaps, thermal transfer degrades, and temperatures rise. Replacing the paste restores the thermal connection and drops temperatures, often by 10 to 25 degrees Celsius.

What you need

• Thermal paste: A fresh tube of quality thermal paste. Common reliable options include Noctua NT-H1, Arctic MX-6, and Thermal Grizzly Kryonaut. A single tube contains enough paste for multiple applications. Avoid extremely cheap pastes — they dry out faster and provide less thermal conductivity. Do not use liquid metal paste unless you know what you are doing — liquid metal is electrically conductive and can short circuit components if it spills outside the CPU heat spreader
• Isopropyl alcohol (90 percent or higher): For cleaning the old paste off the CPU and cooler. 70 percent works but leaves more moisture residue. Higher concentration evaporates faster and cleaner
• Lint-free wipes or coffee filters: For wiping off the old paste. Paper towels work but can leave fibers. Microfiber cloths also work well. Do not use tissue paper — it disintegrates and leaves fibers on the surface
• Screwdriver: To remove the CPU cooler. The specific type depends on your cooler's mounting system (Phillips head for most stock coolers, a variety of sizes for aftermarket coolers)

Desktop CPU — step by step

1. Shut down and unplug: Turn off the computer, unplug the power cord, and press the power button once to discharge residual power. Leave unplugged throughout the procedure
2. Remove the CPU cooler: The cooler is held to the motherboard by one of several mounting systems:
   • Intel stock cooler (push-pin): Four push-pins at the corners of the cooler. Turn each pin 90 degrees counterclockwise, then pull straight up. All four pins must release for the cooler to come off
   • AMD stock cooler (clip or screw): AMD Wraith coolers use either a clip that hooks onto a bracket around the CPU socket, or four screws through the bracket. Release the clip lever or unscrew in a diagonal pattern (loosen each screw a few turns, alternating diagonally, to release pressure evenly)
   • Aftermarket tower coolers: Typically use a backplate behind the motherboard with screws or spring-loaded mounting hardware. The specific removal varies by cooler model — check the cooler's manual if unsure
3. Twist before lifting: Before pulling the cooler straight up, gently twist it 15 to 20 degrees clockwise and counterclockwise. Old dried paste can bond the cooler to the CPU heat spreader. Pulling straight up without twisting can pull the CPU out of the socket (especially on AMD AM4/AM5 where the CPU is held by a latch, not a cover). Twisting breaks the bond safely
4. Clean the old paste off the CPU: Apply a small amount of isopropyl alcohol to a lint-free wipe and gently wipe the top of the CPU heat spreader. The old paste will dissolve and wipe away. Clean until the metal surface is shiny and free of residue. If the paste is extremely dried and hard, let the alcohol soak on it for 30 seconds before wiping
5. Clean the cooler's contact surface: Do the same to the flat bottom of the cooler (the copper or aluminum surface that contacts the CPU). Clean until it is smooth and residue-free
6. Apply new thermal paste: Apply a small amount of paste to the center of the CPU heat spreader. The most common and reliable method is a single dot about the size of a pea (roughly 3 to 4 millimeters in diameter). Do not spread the paste manually — the pressure of the cooler mounting will spread it evenly. Too much paste is better than too little — excess paste squeezes out the sides harmlessly (unless using liquid metal, which must not overflow). Too little paste leaves gaps that run hot
7. Remount the cooler: Place the cooler back on the CPU, aligning it with the mounting points. Apply pressure evenly and secure the mounting hardware in a diagonal pattern (tighten opposite corners alternately). This ensures even pressure across the CPU surface, which spreads the paste uniformly. Do not over-tighten — snug is sufficient. Over-tightening can crack the CPU die on chips without a metal heat spreader (this mainly applies to older designs)
8. Reconnect the fan: Plug the cooler's fan cable back into the CPU_FAN header on the motherboard. Forgetting this step means the cooler has no airflow and the CPU will overheat within minutes of booting

Laptop thermal paste replacement

Laptop CPUs and GPUs also use thermal paste, and the paste dries out the same way. However, replacing laptop thermal paste requires partial disassembly of the laptop:

• The process varies significantly by laptop model. Generally: remove the bottom cover (screws, often hidden under rubber feet or stickers), locate the copper heat pipe assembly that covers the CPU and GPU, unscrew the heat pipe (typically 4 to 8 screws with numbered order — follow the numbers when removing and reinstalling), clean and repaste both the CPU and GPU die surfaces, and reassemble in reverse order
• Laptop CPUs and GPUs often have exposed silicon dies (no metal heat spreader like desktop CPUs). Be extremely careful not to chip the die edges or scratch the die surface. Apply paste gently and do not use liquid metal on bare dies unless you have experience — liquid metal reacts with aluminum heat pipes and can destroy them
• After repasting a laptop, temperatures typically drop 10 to 20 degrees Celsius and the fans run noticeably quieter because they no longer need to spin at maximum speed to maintain safe temperatures

Expected results

After replacing thermal paste on a system where the old paste was dried out:

• Idle temperatures: Should be 30 to 45 degrees Celsius (down from 50 to 65 with dried paste)
• Load temperatures: Should be 65 to 85 degrees Celsius depending on the CPU, cooler, and workload (down from 90 to 100+ with dried paste)
• Fan noise: Reduced because the fans do not need to spin as fast to maintain the same temperature
• Throttling: Should stop — the CPU stays below the thermal throttle threshold and maintains its full boost frequency

If temperatures do not improve after repasting, the cooler itself may be the issue — a fan with a failing bearing, a heat pipe that has lost its working fluid, or a cooler that is insufficient for the CPU's power output.

Thermal paste replacement in Columbus

Luxurious Computers replaces thermal paste on desktops and laptops — cleaning the old compound, applying fresh paste with the correct method, and verifying temperature improvement with before-and-after measurements.