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For most desktop CPUs, apply a small 3–4 mm dot in the center of the heat spreader and let the cooler’s pressure spread it. For larger heat spreaders—especially Intel LGA1700/LGA1851 and AMD AM5—a five-dot pattern is a conservative, coverage-focused option: four dots about 2 mm wide near the corners, plus one 3–4 mm dot in the center. Large workstation CPUs need a manufacturer-specific multi-dot pattern; laptops and bare-die processors do not follow the usual desktop rule.
There is no single amount that is optimal for every CPU and paste. The goal is a thin, continuous layer across the contact area—not a thick mound. Follow the thermal paste maker’s instructions if they specify a different method.
Quick guide: choose a pattern for your CPU
| CPU or package | Starting pattern |
|---|---|
| Smaller conventional desktop heat spreader, such as Intel LGA115x or LGA1200 | One central dot, about 3–4 mm wide |
| AMD AM4 | One central 3–4 mm dot is a reasonable default; follow the paste maker’s directions if they differ |
| Intel LGA1700 or LGA1851 | Four approximately 2 mm dots near the corners and one 3–4 mm center dot is a coverage-focused choice |
| AMD AM5 | One 3–4 mm center dot is a simple option; five dots are a conservative choice for broader coverage |
| Threadripper, Xeon workstation, or another large package | Use the paste maker’s multi-dot pattern for that package size |
| Laptop, bare die, or direct-die cooler | Follow the device or cooler instructions; do not assume the desktop pattern applies |
“Pea-sized” is only a visual shorthand, not a precise measurement. A literal pea may be too much for a small heat spreader, while a tiny grain of rice may be too little for a larger one.
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The CPU’s metal heat spreader and the cooler’s cold plate look smooth, but their surfaces have microscopic imperfections. Thermal paste fills those gaps so heat can pass from the CPU to the cooler more effectively. It should replace air in the uneven spots, not sit as a thick insulating layer between the two surfaces.
#1 Best Overall
- CONSISTENT QUALITY: Our thermal paste packaging design has evolved over time, but the formula has remained the same, ensuring reliable performance.
- EXCELLENT PERFORMANCE: ARCTIC MX-4 thermal paste is made of carbon microparticles, guaranteeing extremely high thermal conductivity. This ensures that heat from the CPU/GPU is dissipated quickly & efficiently
- SAFE APPLICATION: The MX-4 is metal-free and non-electrical conductive which eliminates any risks of causing short circuit, adding more protection to the CPU and VGA cards
- HIGH DURABILITY: In contrast to metal and silicon thermal compound, the MX-4 does not compromise over time. Once applied, you do not need to apply it again as it will last at least for 8 years
- EASY TO APPLY: With an ideal consistency, the MX-4 is very easy to use, even for beginners
- Too little: It may leave gaps or areas without adequate contact.
- Too much: Mounting pressure usually pushes some excess outward, but an unnecessarily thick layer can reduce thermal effectiveness and make a mess. Intel cautions against excess paste and overflow onto the motherboard in its thermal-paste application guide.
- A suitable amount: Enough to form a thin, continuous layer across the contact area once the cooler is mounted, without a large bead spilling far beyond the heat spreader.
Paste is only one part of the cooling system. Cooler capacity, mounting pressure, case airflow, fan or pump operation, ambient temperature, CPU power limits, and the paste itself all affect temperatures. Adding paste will not fix a loose mount, a forgotten protective film, or poor airflow.
Center dot, five dots, line, or X?
One central dot
This is a straightforward default for smaller, conventional desktop heat spreaders. Intel’s general advice is to place a rice-grain-to-pea-sized amount in the center and let the cooler spread it. Noctua specifies a 3–4 mm center dot for smaller CPUs in its NT-H1 application manual.
Use a center dot when the paste maker recommends it or you want a simple installation with fewer opportunities to apply paste unevenly.
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For medium-sized CPUs, Noctua’s guide recommends four dots of about 2 mm near the corners, plus a 3–4 mm dot in the center. That pattern is a conservative option for Intel LGA1700/LGA1851 and AMD AM5 when broader coverage is the priority. It is guidance for a particular paste and package category—not a universal rule that every CPU must use five dots.
Rank #2
- WELL PROVEN QUALITY: The design of our thermal paste packagings has changed several times, the formula of the composition has remained unchanged, so our MX pastes have stood for high quality
- EXCELLENT PERFORMANCE: ARCTIC MX-4 thermal paste is made of carbon microparticles, guaranteeing extremely high thermal conductivity. This ensures that heat from the CPU/GPU is dissipated quickly & efficiently
- SAFE APPLICATION: The MX-4 is metal-free and non-electrical conductive which eliminates any risks of causing short circuit, adding more protection to the CPU and VGA cards
- 100 % ORIGINAL THROUGH AUTHENTICITY CHECK: Through our Authenticity Check, it is possible to verify the authenticity of every single product
- EASY TO APPLY: With an ideal consistency, the MX-4 is very easy to use, even for beginners, Spatula incl.
AM5 illustrates why recommendations can differ: Noctua recommends five dots for its paste, while Tom’s Hardware’s guide describes a single 3–4 mm center dot for Ryzen 7000, 8000, and 9000 processors. Both are legitimate approaches. Use the instructions for your compound, or choose five dots if you want a coverage-focused starting pattern.
Lines, X patterns, and manual spreading
A line, X, or manually spread layer is not automatically better than a dot pattern. The right approach depends on the CPU’s shape, cooler contact plate, and paste viscosity. Some paste makers publish CPU-specific amounts or spreading steps—for example, Arctic Silver’s AMD instructions and Intel instructions vary by application.
Unless your paste or cooler instructions say to spread it, place the recommended amount and let the mounting pressure do the work. Intel warns that manual spreading done incorrectly can introduce air bubbles; Noctua likewise generally advises allowing its paste to spread beneath the cooler. If you do spread by hand because the product instructions call for it, use the method those instructions specify.
Platform-specific notes
Intel LGA115x and LGA1200
For a typical cooler and paste combination, one central dot about 3–4 mm wide is a suitable starting point. These are in Noctua’s smaller-CPU category.
Rank #3
- SAFETY APPLICATION: BSFF is metal-free and non-conductive, which eliminates any risk of short circuit and adds more protection to the CPU and VGA card.
- BETTER THAN LIQUID METAL: It is made of carbon microparticles, guaranteeing extremely high thermal conductivity. This ensures that heat from the CPU/GPU is dissipated quickly & efficiently.
- HIGH DURABILITY: BSFF thermal paste Edition formula has excellent component heat dissipation performance and has the stability to push the system to the limit.
- EXCELLENT PERFORMANCE: In contrast to metal and silicon thermal conductive adhesives, BSFF thermal paste will not compromise over time. After applying, you do not need to apply again because it will last at least 5 years.
- EASY TO APPLY: BSFF thermal paste has ideal consistency and is very easy to use even for beginners
Intel LGA1700 and LGA1851
These larger heat spreaders benefit from deliberate coverage. Noctua recommends four approximately 2 mm corner dots plus a 3–4 mm center dot; Tom’s Hardware describes the same general five-dot approach for Intel 12th–14th generation and Core Ultra desktop processors. Intel’s broader support guidance still calls for a center amount between a grain of rice and a pea. Treat five dots as a paste-specific or coverage-focused option, not a mandatory Intel rule.
AMD AM4 and AM5
For AM4, a center dot is usually a reasonable default, subject to the compound’s instructions. On AM5, choose a center dot for simplicity or five dots for more deliberate coverage. The AM5 heat spreader has side cut-outs where excess compound can collect. An AM5 paste guard, such as Noctua’s NT-H2 AM5 Edition or the separate NA-STPG1 guard, can help keep paste out of those cut-outs when installed as directed.
Threadripper and workstation processors
Do not use a single desktop-sized pea of paste on a very large package. For its “big” CPU category, which includes AMD TR4/sWRX8 and Intel LGA4677, Noctua specifies nine approximately 2 mm dots plus four 3–4 mm dots. Use the particular paste maker’s pattern for your processor and cooler rather than transferring that layout blindly to a different product.
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Laptops, bare dies, and direct-die cooling
Laptop coolers can have different contact areas and mounting pressure from desktop coolers. A delidded processor, bare die, or direct-die cooler also lacks the desktop heat spreader assumed by ordinary dot advice. Follow the laptop, CPU, cooler, or paste manufacturer’s instructions for the specific hardware.
Rank #4
- NEXT-LEVEL THERMAL PERFORMANCE: MX-7 features a performance-optimized, dense, and highly viscous consistency. Its high filler content ensures exceptional heat transfer
- LONG-TERM STABILITY: High cohesion prevents pump-out, dry-out, or bleeding even under repeated thermal cycles, ensuring long-lasting and consistent performance without the need for frequent reapplication
- PERFECT APPLICATION: MX-7 cannot be spread manually by design. Its low adhesion allows the paste to distribute naturally under cooler pressure, forming a thin bond line without trapping air bubbles
- SAFE FOR ALL DEVICES: MX-7 is electrically non-conductive and non-capacitive, making it completely safe for CPUs, GPUs, laptops, consoles, and other, no risk of short circuits or electrical discharge
- INCLUDES MX CLEANER: Thoroughly removes old thermal paste and prepares contact surfaces for optimal performance before applying new thermal compound.
How to apply thermal paste
- Shut down and unplug the computer. Let it cool before working inside the case.
- Remove the cooler carefully. If it seems stuck to the CPU, gently twist it to loosen the paste rather than pulling hard straight upward.
- Clean both contact surfaces. Remove old paste from the CPU heat spreader and cooler plate with a lint-free cloth or tissue. Suitable isopropyl alcohol can help; Noctua notes that it is not strictly necessary for removing its own paste. Allow cleaned surfaces to dry fully.
- Inspect the cooler and mounting hardware. Check that no protective film remains on the cold plate and that the bracket is correct for your socket.
- Apply fresh paste to the CPU. Use the pattern for your CPU size and the paste maker’s directions. Do not add paste on top of old paste or onto a cooler that already has factory-applied paste.
- Lower the cooler onto the CPU. Keep it level and avoid sliding it around, which can shift paste unevenly.
- Tighten it evenly. If the mount has multiple screws, tighten them progressively in a cross pattern unless the cooler’s manual gives a different sequence. Follow specified mounting instructions.
- Do not lift the cooler to check the spread. If you remove it after mounting, clean both surfaces and apply fresh paste before reinstalling. Intel advises a fresh application after cooler removal because a disturbed layer can trap air.
- Reconnect the CPU fan or pump. Confirm it is connected to the correct motherboard header and operating.
How to tell whether the application worked
Do not judge paste application from idle temperature alone. Modern CPUs change voltage, frequency, and fan speed quickly, so idle readings can vary even when the cooler is installed correctly.
- Confirm the CPU fan or liquid-cooling pump is running.
- Check that the cooler is firmly mounted and does not rock.
- Run a known workload and watch for immediate thermal throttling or unexpectedly high temperatures.
- Compare readings under similar workloads, ambient temperature, fan curves, and CPU power settings.
- Consider unusually large differences between core temperatures, but do not treat one reading by itself as proof of bad paste.
A thin layer visible at the edge after mounting is not a failure; the aim is not to leave a thick mound on the CPU. A small temperature change after repasting also does not prove that a particular pattern was optimal. Mounting and test conditions matter.
Troubleshooting common problems
Temperatures are still high
Check the likely causes before adding more paste:
- Make sure the cooler’s protective film was removed.
- Confirm the cooler is mounted evenly, with the correct socket bracket and screw sequence.
- Verify the CPU fan or pump is connected and running.
- Check case airflow and dust buildup.
- Review CPU power limits and fan curves.
- Account for ambient temperature and compare against a similar workload.
- Only then consider whether the paste is old, poorly applied, or unsuitable for the application.
The cooler was removed after mounting
Clean the paste off both surfaces and apply a fresh amount. Do not reinstall the cooler over a layer that has been lifted or disturbed.
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Paste spilled into AM5 heat-spreader cut-outs
Clean carefully with a suitable method and avoid scraping the CPU with a sharp metal tool. A guard can help prevent future buildup; follow the guard maker’s installation directions. Do not let cleaning liquid or debris enter the socket, and let surfaces dry before powering on.
Best Value
- NEXT-LEVEL THERMAL PERFORMANCE: MX-7 features a performance-optimized, dense, and highly viscous consistency. Its high filler content ensures exceptional heat transfer
- LONG-TERM STABILITY: High cohesion prevents pump-out, dry-out, or bleeding even under repeated thermal cycles, ensuring long-lasting and consistent performance without the need for frequent reapplication
- PERFECT APPLICATION: MX-7 cannot be spread manually by design. Its low adhesion allows the paste to distribute naturally under cooler pressure, forming a thin bond line without trapping air bubbles
- SAFE FOR ALL DEVICES: MX-7 is electrically non-conductive and non-capacitive, making it completely safe for CPUs, GPUs, laptops, consoles, and other, no risk of short circuits or electrical discharge
- EFFORTLESS CLEANING WITH MX CLEANER: Removes old thermal paste thoroughly, preparing contact surfaces for optimal performance. Also available as a convenient bundle with MX-7
Paste reached the motherboard
Many conventional pastes are non-conductive, so a small spill is generally more a cleanup issue than an immediate electrical hazard. Still, clean it carefully, avoid pushing material into sockets or connectors, and do not power the system while cleaning products are wet. This caution does not apply to all compounds: electrically conductive liquid metal requires different handling and should not be treated like ordinary thermal paste.
The tube has been open for a long time
Check the storage and shelf-life instructions for that specific product. Thermal compounds do not all have the same usable life. Noctua describes NT-H1 and NT-H2 as having long-term stability, but that claim should not be generalized to other pastes.
Do you need to buy new paste?
If your cooler came with fresh factory-applied paste, use that layer as supplied; do not add more on top. If you are repasting and have no suitable compound, a mainstream syringe is enough for many ordinary builds. Cleaning wipes are convenient, but a lint-free cloth and suitable isopropyl alcohol work for many users. An AM5 guard may be useful if avoiding cleanup in the heat-spreader cut-outs matters to you.
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Quick Recap
Before you power on
- Did you choose a pattern suited to the CPU package and paste?
- Did you use fresh paste on clean surfaces?
- Is the cooler free of protective film and mounted evenly?
- Is the fan or pump connected and running?
- Will you check temperatures under a comparable workload rather than relying only on idle readings?
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