Replacing the thermal paste in a laptop is a procedure that can extend the life of the device by years. But one of the most common questions asked by both newbies and experienced users is: How much thermal paste should be applied?so as not to overdo it and save where it is critical. The answer depends on many factors: laptop model, processor type, cooling system design, and even the brand of thermal interface.
In this article we will look at exact norms for applying thermal paste for different scenarios, we'll explain why "more is better" is a dangerous myth, and show how to avoid common mistakes. You will also learn what tools you will need for the job, how to properly remove old paste and what alternative thermal interfaces (eg liquid metal) can be used in extreme cases.
Why is the amount of thermal paste critical for a laptop?
Thermal paste is not just a “lubricant” between the processor and the heatsink. It performs two key functions:
- 🔹 Filling microgaps between the CPU/GPU crystal and the surface of the heatsink (even perfectly polished metals have irregularities at the micro level).
- 🔹 Increased thermal conductivity - the air that remains in these gaps conducts heat into 100–1000 times worsethan high-quality thermal paste.
If there is too little paste, air pockets form and the processor begins to overheat already at 50–60% load (especially important for thin laptops with weak cooling systems). If there is too much paste, it can:
- 🔸 Leak over the edges of the crystal and contaminate the contacts on the motherboard.
- 🔸 Create an insulating layer that, contrary to expectations, will worsen heat dissipation.
- 🔸 Cause a short circuit if the paste is conductive (for example, based on liquid metal).
⚠️ Attention: In laptops with integrated graphics (For example, Intel Iris Xe or AMD Radeon Vega) thermal paste is often applied to both the chipset and the GPU. An insufficient amount on any of them will lead to throttling (automatic reduction in frequencies) after 10–15 minutes of playing or rendering.
How much thermal paste is needed for different types of processors
General rule: There should be enough thermal paste to cover the processor die with a thin layer, but not so much that it leaks over the edges under radiator pressure. Below are the approximate standards for different types of CPU/GPU in laptops.
| Processor type | Crystal Size (approx.) | Recommended amount of paste | Examples of laptop models |
|---|---|---|---|
| Mobile Intel Core (U-series) | ~15×15 mm | 0.05–0.1 g (pea 3–4 mm) | Dell XPS 13, HP Spectre x360, Lenovo ThinkPad T14 |
| Intel Core (H-series, 45–65 W) | ~20×20 mm | 0.1–0.15 g (pea 4–5 mm) | ASUS ROG Zephyrus G14, MSI GE76 Raider |
| AMD Ryzen (U-series, 15 W) | ~12×12 mm | 0.03–0.05 g (pea 2–3 mm) | Acer Swift 3, Lenovo IdeaPad 5 |
| AMD Ryzen (H-series, 45–65 W) | ~25×15 mm | 0.15–0.2 g (5×20 mm strip) | ASUS TUF Gaming A15, Legion 5 Pro |
| Discrete graphics (NVIDIA/AMD) | ~30×20 mm | 0.2–0.3 g (strip or cross) | Alienware m15, Razer Blade 15 |
For an accurate calculation, you can use the formula:
Paste volume (mm³) ≈ Crystal area (mm²) × 0.05–0.1 mm (layer thickness)
For example, for a processor Intel Core i7-12700H with crystal 20×20 mm:
20 × 20 × 0.05 = 20 mm³ ≈ 0.02 g (but in practice they apply a little more, since the paste is not distributed perfectly).
- Arctic MX-6
- Noctua NT-H2
- Thermal Grizzly Kryonaut
- Coollaboratory Liquid Ultra
- Other
How to apply thermal paste: step-by-step instructions
Before applying new paste, you must completely remove the old one. For this you will need:
- 🧴 Isopropyl alcohol (90% or higher) or a specialized cleaner (e.g. Arctic ArctiClean).
- 🧻 Lint-free wipes or coffee filters (they don't leave lint).
- 🪛 Plastic spatula or old bank card (to remove dried paste).
Application process:
- Surface cleaning. Moisten a cloth with alcohol and carefully remove any remaining old paste from the processor and heatsink. Do not use cotton wool - it may leave fibers!
- Preparing the paste. If the thermal paste is thick (for example, Thermal Grizzly Kryonaut), it can be slightly warmed in your hands to make application easier.
- Application. For most processors, the optimal method is “pea” (for small chips) or “strip” (for large ones, like AMD Ryzen 9).
- Radiator installation. Secure the radiator evenly, without distortions. Tighten the screws criss-crossto avoid uneven pressure.
☑️ Checklist before replacing thermal paste
⚠️ Attention: If you are using liquid metal (For example, Coollaboratory Liquid Ultra), it cannot be applied to aluminum radiators - this will lead to corrosion. Such pastes are only suitable for copper surfaces and require electrical insulation protection (for example, tapes Kapton) around the crystal.
Typical mistakes when replacing thermal paste
Even experienced users sometimes make mistakes that ruin all their efforts. Here are the most common:
- 🔴 Too thick layer. The paste should not be visible around the edges after tightening the radiator. If it "comes out" - you have gone too far.
- 🔴 Uneven distribution. If you apply the paste to only part of the crystal, the remaining areas will overheat. This is true for processors with uneven heat release (For example, Apple M1/M2).
- 🔴 Using expired toothpaste. Silicone based thermal interfaces (e.g. Arctic MX-4) lose their properties after 2–3 years even in a closed tube.
- 🔴 Ignoring thermal pads. Some laptops (eg. MSI GS66) in addition to the paste, gaskets are used for the VRM and chipset. They also need to be replaced.
Another common problem is retightening radiator screws. This may lead to:
- 🔸 Deformation of the printed circuit board (especially in thin laptops).
- 🔸 Cracks in the processor crystal (extremely rare, but possible under strong pressure).
- 🔸 Deterioration of heat dissipation due to too tight a fit (the paste is squeezed out completely).
If you are not sure about the amount of paste, apply a little less than necessary and then check the temperatures under load. If necessary, disassemble the laptop and add more. It's safer than overdoing it.
How to check if thermal paste is applied correctly
The only reliable way to evaluate the quality of application is temperature monitoring under load. To do this:
- Install the stress test program: Prime95 (for CPU), FurMark (for GPU) or OCCT (complex test).
- Run the test for 15–20 minutes and monitor the temperatures through HWMonitor, Core Temp or MSI Afterburner.
- Compare the results with the reference values for your model (see table below).
| Processor type | Normal idle temperature | Maximum temperature under load | Critical temperature (throttling) |
|---|---|---|---|
| Intel Core i3/i5/i7 (U-series, 15 W) | 35–45°C | 70–85°C | 90–95°C |
| Intel Core i7/i9 (H-series, 45–65 W) | 40–50°C | 85–95°C | 100°C |
| AMD Ryzen 5/7 (U-series, 15 W) | 40–50°C | 75–85°C | 95°C |
| AMD Ryzen 9 (H-series, 45–65 W) | 45–55°C | 90–100°C | 105°C |
If temperatures exceed normal by 10–15°C, this is a sign:
- 🔹 Not enough pasta.
- 🔹 Uneven application.
- 🔹 Poor contact between the radiator and the processor (the screws may be unevenly tightened).
What to do if the temperatures do not drop after changing the paste?
1. Check if the cooling system is clogged with dust (especially in laptops older than 3 years).
2. Make sure that the cooler is running at full speed (sometimes reinstalling the fan control drivers helps).
3. If liquid metal is used, check whether the contacts have oxidized.
4. In extreme cases, you may need to replace thermal pads or even the radiator (in older laptops they get tired and dissipate heat worse).
Thermal Paste Alternatives: When to Consider Other Options
Classic silicone or metal-based thermal paste is not the only option. In some cases it is advisable to use:
- 💎 Liquid metal (For example, Thermal Grizzly Conductonaut or Coollaboratory Liquid Ultra):
✅ Advantages: thermal conductivity is 3-5 times higher than that of the best pastes (up to 73 W/m K).
❌ Disadvantages: conducts electricity, requires carefulness, is not compatible with aluminum.
- 🧊 Thermal pads (For example, Fujipoly Extreme):
✅ Advantages: do not leak, suitable for chipset and VRM.
❌ Disadvantages: they dissipate heat worse than paste (thermal conductivity ~6–12 W/m K).
- 🔥 Phase transition materials (For example, Arctic MX-6 with microcapsules):
✅ Advantages: durability (up to 8 years), high stability.
❌ Disadvantages: more expensive than regular pastes, require “break-in” (maximum efficiency after 200 hours of operation).
Liquid metal is justified in:
- 🔸 Extreme overclocking (for example, in ASUS ROG Strix with Intel Core i9-13900HX).
- 🔸 Laptops with poor cooling system (For example, MacBook Pro 2018–2020 with throttling problems).
- 🔸 Devices where the paste dries out too quickly (for example, in servers or mining farms).
⚠️ Attention: If you decide to use liquid metal, be sure to insulate the contacts around the crystal Kapton tape or nail polish (yes, it works!). Even one drop on the motherboard can damage your laptop.
For 90% of users, the optimal choice is high-quality silicone paste (for example, Noctua NT-H2 or Arctic MX-6). Liquid metal and gaskets are needed only in specific cases.
FAQ: Frequently asked questions about thermal paste in laptops
Can I use thermal paste from a PC for a laptop?
Yes, but with reservations. PC pastes (for example, Cooler Master MasterGel) often have a higher viscosity, which can make it difficult to apply to small laptop crystals. The best option is pastes with low turnover (For example, Thermal Grizzly Kryonaut or Noctua NT-H1).
How often should you change the thermal paste in your laptop?
Depends on the type of paste and operating conditions:
- 🔹 Silicone pastes (For example, Arctic MX-4): once every 2–3 years.
- 🔹 Metal-containing (For example, Thermal Grizzly Kryonaut): once every 1–2 years (they dry out faster).
- 🔹 Liquid metal: every 5+ years (but requires checking for oxidation).
If the laptop is used in dusty conditions or frequently overheats, the interval will be reduced.
What happens if you don't change the thermal paste at all?
The consequences depend on the laptop model:
- 🔸 Decreased performance due to throttling (for example, Intel Core i7 may lose up to 40% power).
- 🔸 Accelerated wear of components (high temperatures shorten the life of capacitors and transistors).
- 🔸 Sudden shutdowns when a critical temperature is reached (especially in games or rendering).
- 🔸 Hull deformation (In extreme cases, the plastic around the keyboard may melt).
In laptops with soldered graphics (For example, NVIDIA Max-Q) overheating can lead to detachment of the chip from the board - this non-repairable defect.
Is it possible to apply thermal paste to the chipset and VRM?
Yes, but it's not always necessary. Chipset (eg. Intel HM570 or AMD B550) are usually covered with a thermal pad rather than a paste because:
- 🔹 It produces little heat (3-7 W versus 45-125 W for CPU/GPU).
- 🔹 The gasket is easier to install and does not require precise dosing.
VRMs (power supply modules) are also more often covered with spacers, but in some laptops (e.g. Gigabyte Aero 15) paste is used for them.
Which thermal paste is best for a gaming laptop?
For gaming laptops (eg. ASUS ROG Strix, Lenovo Legion) is critical long-term stability And high thermal conductivity. Best options:
- Thermal Grizzly Kryonaut (12.5 W/m·K) - ideal for extreme loads, but requires replacement every 1–2 years.
- Noctua NT-H2 (8.5 W/m·K) - more durable (up to 5 years), does not conduct current.
- Coollaboratory Liquid Ultra (38 W/mK) - for experienced users who are willing to take risks for maximum cooling.
Suitable for budget options Arctic MX-6 (11 W/m·K) - it is cheaper, but almost as efficient.