Laptop Thermal Paste Replacement Guide (2026) — When & How to Repaste CPU/GPU

Is your laptop running hot? Thermal paste degrades over time, losing its ability to transfer heat from your CPU and GPU to the cooling system. After 3–5 years, even premium thermal paste begins to pump out and dry up, causing your laptop to throttle performance and run uncomfortably warm. This guide covers everything you need to know about replacing thermal paste, why it matters, and how to do it safely.

Why Thermal Paste Degrades Over Time

The Pump-Out Effect

Thermal paste isn’t a permanent solution—it’s a temporary bridge between your CPU and heatsink. Over months and years, repeated heating and cooling cycles cause the paste to break down and ooze out around the chip (called “pump-out”). The silicon compounds in the paste separate from the liquid carrier, leaving a dried, crusty residue with poor thermal conductivity. This is completely normal and affects all laptops eventually.

Laptop-Specific Challenges

Laptops are tougher on thermal paste than desktops because:

• Constant thermal cycling: Laptops heat up quickly under load, cool down rapidly when idle, and repeat this dozens of times per day.
• Compact design: Close component spacing means less paste is used to begin with, so pump-out accelerates relative to thicker desktop applications.
• Poor airflow retention: Many laptops aren’t repasted from the factory with high-quality paste—manufacturers often use cheap thermal interface material to cut costs.
• Dust accumulation: Combined with degrading paste, dust in heatsink fins compounds thermal problems.

Signs Your Laptop Needs Thermal Paste Replacement

Temperature Red Flags

Use a tool like CPU-Z or HWiNFO to monitor your CPU temperature. If you’re seeing:

• Idle temps above 50°C: Your laptop is struggling to shed basic system heat. Normal idle should be 30–45°C.
• Full-load temps exceeding 95°C: Throttling is likely happening, and performance is tanking.
• Rapid temperature spikes: Paste degradation causes inconsistent heat transfer, leading to dramatic temp swings.

Performance and Noise Clues

Beyond temperature readings, watch for:

• Unexpected performance drops: Games that used to run smoothly now stutter. Video rendering takes twice as long. Fans spin up hard even with light tasks.
• Constant loud fans: If your laptop’s fans sound like a jet engine all day, bad thermal paste is usually the culprit.
• Laptop shuts down under load: Thermal throttling maxed out, and the system powers off as a safety measure.

Age-Based Replacement

As a preventive measure, repaste every 3–5 years regardless of symptoms. Gamers and professionals running sustained high loads should consider a 2–3 year interval. If your laptop is showing any of the above signs and it’s been more than 2 years since manufacture, repasting is likely the first thing to try before paying for professional repair.

How Much Temperature Improvement Can You Expect?

Real-world temperature improvements after repasting vary, but here’s what to expect:

• Moving from factory paste (bad condition) to Arctic MX-6: 10–20°C drop under sustained load.
• From degraded paste to premium paste like Kryonaut: 15–25°C improvement, especially if idle temps were already high.
• Repasting alone (no other changes): Usually brings idle temps down by 5–15°C and full-load temps by 10–20°C.
• Combined with fan cleaning: Additional 3–8°C improvement.
• Combined with undervolting: Additional 5–15°C without sacrificing performance (see our undervolting guide).

Reality check: If your laptop is reaching 100°C under load even with new paste, there’s likely a deeper issue—clogged heatsink fins, broken heatpipe, or a design flaw. Repasting alone won’t fix those.

What Thermal Paste Should You Buy?

Best Budget Option: Arctic MX-6

Arctic MX-6 is the go-to for most laptop owners. It offers excellent thermal conductivity (4.0 W/mK), doesn’t pump out excessively, and costs only £5–7 per tube. It’s also non-conductive, so accidental spillage won’t short your motherboard.

Premium Performance: Thermal Grizzly Kryonaut

For gaming or workstation laptops where you want maximum cooling, Thermal Grizzly Kryonaut (6.0 W/mK) delivers noticeable improvements over Arctic. Expect to pay £12–18 per tube, but the performance gain can be 2–5°C better under load.

Longevity Leader: Noctua NT-H2

Noctua NT-H2 (4.0 W/mK) is engineered for ultra-long service life. It won’t pump out like cheaper pastes and comes with cleaning wipes. At £10–13, it’s a solid mid-range choice for laptops where you won’t be opening them again for years.

Don’t overspend on exotic pastes. Anything above 6.0 W/mK shows minimal real-world benefit in laptops, and some premium pastes (like certain liquid metal options) are too conductive for close-quarters laptop motherboards.

Do You Need to Open Your Laptop?

Warranty Implications

Opening your laptop to repaste will void any remaining manufacturer warranty. If your laptop is still under guarantee and running hot, contact the manufacturer first. Most will repaste under warranty if thermals are out of spec.

For out-of-warranty machines (typically 2+ years old), DIY repasting is safe and saves £80–150 versus professional repair costs.

Tools You’ll Need

Repasting requires:

• Precision screwdriver set (Phillips #0 and #1 tips)
• Isopropyl alcohol 90%+ concentration
• Lint-free cloth or coffee filters
• Thermal paste (Arctic MX-6 recommended)
• Plastic spudger or old credit card to pry open the case safely
• ESD wrist strap (optional but recommended)

Total cost for supplies: £15–30. Much cheaper than professional service.

Step-by-Step Repasting Process

Before You Start

Safety first:

• Power off the laptop completely and unplug it.
• Wait 10 minutes for components to cool.
• Remove the battery (if removable) or disconnect it internally.
• Ground yourself with an ESD strap or touch a metal case corner periodically.

Step 1: Access the Heatsink

Most gaming and workstation laptops have a bottom panel that unscrews to access the CPU/GPU heatsink. Consult your laptop’s service manual (search “[Model] disassembly guide” online) to locate:

• The bottom panel screws (note different screw lengths—they usually vary).
• The heatsink assembly bolts.
• Any ribbon cables that might interfere.

Take photos as you disassemble. Reassembly is much easier when you have visual reference.

Step 2: Remove the Heatsink

Heatsinks are usually held down by 2–4 bolts in an X or cross pattern. Loosen them gradually in a star pattern, not all the way on one side first. This prevents warping the heatsink or CPU lid. Once loose, gently lift the heatsink away—it may stick slightly to the thermal paste, so wiggle gently.

Step 3: Clean Off Old Paste

This is where patience pays off:

• Dampen your lint-free cloth with isopropyl alcohol (not dripping wet, just damp).
• Gently wipe away the old, dried paste from the CPU and GPU dies.
• For stubborn residue, use a plastic spudger to gently scrape while dampening with alcohol.
• Never use metal tools—you’ll scratch the die surface and reduce thermal contact.
• Repeat with a fresh cloth until the surface is completely clean and shiny.
• Allow 5 minutes for isopropyl alcohol to evaporate completely.

Step 4: Apply New Thermal Paste

Less is more with thermal paste:

• Pea-grain method: Apply a small dot (pea-sized) of paste in the center of the CPU die.
• For GPU: Apply a similar dot to any separate GPU die if your laptop has a discrete graphics chip.
• Don’t spread it manually. The heatsink pressure will distribute it evenly when clamped down.

Common mistake: Using too much paste. Excess paste can squeeze out onto nearby components and reduce cooling efficiency.

Step 5: Reinstall and Tighten

Place the heatsink back carefully and align the mounting bolts. Tighten in a star pattern (if X-mounted, go opposite corners alternately) to ensure even pressure. Tighten snugly, not with full force—you’ll feel resistance as the paste compresses. Over-tightening can damage the CPU lid.

Step 6: Reassemble and Test

Once the heatsink is secure, reassemble the bottom panel and reconnect the battery. Boot up your laptop and monitor temperatures using HWiNFO or CPU-Z. You should see an immediate drop in idle and load temperatures.

Common Repasting Mistakes to Avoid

• Using too much paste: More paste ≠ better cooling. The excess just gets squeezed onto nearby components.
• Not cleaning the heatsink base: Old paste on the heatsink’s bottom plate must also be cleaned off with alcohol. Reusing dirty heatsinks defeats the purpose.
• Forgetting to remove protective film: Some thermal paste tubes come with a plastic film over the nozzle tip. Remove it before applying.
• Mixing pastes: Don’t apply new paste over old paste. Always clean completely with isopropyl alcohol first.
• Tightening bolts unevenly: This causes warping and poor thermal contact. Use a star pattern.
• Using conductive paste carelessly: Most laptop pastes are non-conductive, but if you use conductive thermal paste, one small spill can short your motherboard. Arctic MX-6 is non-conductive—safer choice for beginners.

How Often Should You Repaste?

As a general guide:

• Gaming laptops under heavy daily load: Every 2–3 years.
• Business/office laptops with light use: Every 4–5 years.
• Premium paste (Kryonaut, NT-H2): Extend intervals by 1–2 years due to better pump-out resistance.
• If temperatures stabilize and remain low after repasting: You don’t need to repaste again until thermals start climbing or 3–4 years pass, whichever comes first.

Keep temperature logs. If you notice idle temps creeping up by 5–10°C over 6 months, it’s a sign paste degradation is happening again.

Alternatives to Repasting

Cleaning Your Fans

Before you open up the CPU, try cleaning your laptop fans and heatsink fins first. Dust buildup is a massive thermal culprit and requires no paste replacement. Learn more in our complete fan cleaning guide.

Using a Cooling Pad

External cooling pads provide 5–8°C of ambient temperature reduction without opening your laptop. They’re cheap (£20–50) and non-invasive. See our cooling pad vs. repasting comparison for details.

Undervolting

Undervolting reduces CPU voltage, lowering heat generation by 5–15°C without losing performance. It’s software-only and reversible. Check our undervolting guide to see if your CPU supports it.

Frequently Asked Questions

Is it safe to repaste my laptop myself?

Yes, repasting is one of the safest laptop modifications. You’re not flashing BIOS or replacing critical components—just swapping thermal paste. The main risks are dropping screws (use a magnetic mat) and accidentally touching the CPU die. As long as you work carefully and ground yourself against static, you’ll be fine. Millions of laptop owners have done this successfully.

Will repasting damage my warranty?

Yes, opening your laptop voids the manufacturer’s warranty immediately. However, most laptop warranties are 1 year, and thermal paste degradation typically shows up after 2–3 years, so this rarely matters. Out-of-warranty machines are fair game for DIY repasting.

How long does the repasting process take?

If you’re careful and methodical, 30–60 minutes for most laptops. Experienced users can do it in 20 minutes. Don’t rush—speed isn’t worth reassembling things incorrectly.

What’s the difference between thermal paste and thermal pads?

Thermal paste is liquid-based and used for CPUs and GPUs. Thermal pads are solid silicone layers used on RAM, VRM (voltage regulator modules), and other components. Never confuse the two. Use paste for your CPU/GPU, and avoid touching thermal pads on other components unless you’re replacing them.

Can I use liquid metal thermal paste in my laptop?

Not recommended. Liquid metal (like Conductonaut) is conductive and can short nearby components in a laptop’s compact layout. Stick with non-conductive pastes like Arctic MX-6. Even pros rarely use liquid metal in laptops due to the risk.

Should I repaste my MacBook?

Yes, but MacBooks require special tools (pentalobe screwdrivers) and are trickier to disassemble. Apple also uses custom thermal paste. For a detailed MacBook repasting guide, see our MacBook repasting article.

How do I know if my repasting was successful?

Monitor temperatures immediately after reassembly using HWiNFO or similar tools. Successful repasting typically drops idle temps by 5–15°C and load temps by 10–20°C. If you see no improvement, the heatsink may not be making full contact—reseat it and try again.

What if my laptop is still hot after repasting?

Repasting works best when the original problem is degraded paste. If you repaste and see little improvement, investigate these:

• Clogged heatsink fins: Dust blocking airflow. Clean with compressed air.
• Broken fan: Heatsink design flaw or failing bearing. May need professional service.
• Design limitation: Some thin gaming laptops have inherently poor thermal design. Consider external cooling pad or undervolting.

Recommended Products

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