The 8 Best Thermal Paste

The BSFF BS-139 thermal paste represents a solid middle-ground solution for PC builders seeking reliable thermal management without the complications of liquid metal or conductive compounds. Its carbon microparticle composition achieves a respectable 13.9W/m.k thermal conductivity rating, which translates to efficient heat transfer from CPUs and GPUs under normal operating conditions and moderate overclocking scenarios. The non-conductive, metal-free formula eliminates the primary concern with premium thermal compounds: accidental contact with electrical pins or components that could cause short circuits or component damage.

Installation and usability stand out as key strengths of this product. The included application toolkit removes guesswork for first-time users, while the paste's ideal consistency allows for easy spreading without requiring specialized techniques. Once applied, the compound maintains its thermal properties for approximately five years, meaning users won't need to reapply or replace it frequently. This durability translates to genuine value over the product's lifespan, especially for builds that remain stable and don't require regular maintenance.

The primary limitation worth noting is the modest 1.8g quantity, which covers roughly one to two processor applications depending on application technique. Users planning multiple installations or maintaining a spare tube may want to consider the larger 5.5g option. Additionally, while this compound performs admirably for standard cooling and moderate overclocking, enthusiasts pushing extreme overclocking boundaries may find liquid metal alternatives offer marginal performance advantages, though at significantly higher risk of component damage.

Preparation

Ensure your CPU or GPU is clean and free of old thermal paste. Use isopropyl alcohol and a lint-free cloth to gently remove residue from the processor heat spreader. Allow the surface to dry completely before application.

Application Steps

1. Dispense: Apply a small amount (roughly the size of a grain of rice to a small pea) directly onto the center of the CPU heat spreader. The included toolkit helps with precise application.

2. Spread: Using the application tool provided, gently spread the paste in a thin, even layer across the entire heat spreader surface. Avoid excessive pressure.

3. Install Cooler: Mount your CPU cooler according to manufacturer instructions, applying even pressure to ensure proper contact between the cooler base plate and the thermal paste layer.

Best Practices

• Less is more: A thin, even layer outperforms a thick application
• Avoid air bubbles by spreading carefully and mounting the cooler smoothly
• Allow 24 hours for the paste to settle before stress testing or overclocking
• Check temperatures after one week of use to ensure optimal contact

The BSFF BS-139 balances performance, safety, and durability effectively for most users, with the primary trade-off being slightly lower peak thermal conductivity compared to liquid metal solutions.

The HY-510 thermal paste addresses a fundamental need in PC building and maintenance: efficient heat transfer between processors and cooling solutions. With a thermal conductivity rating of 1.93 W/m-k and a nano-particle structure incorporating micronized aluminum and zinc oxide, this compound is engineered to fill microscopic surface irregularities between your CPU or GPU and heatsink. The formula's ability to maintain consistent performance across a wide temperature range from -30°C to 280°C makes it suitable for both standard cooling setups and overclocking scenarios where thermal demands are elevated.

What sets this product apart is its non-conductive composition, which eliminates the risk of short circuits that can damage sensitive electronics. This safety feature is particularly valuable for users working inside computer cases with limited clearance or those new to thermal paste application. The paste maintains a stable, non-drying consistency at high temperatures, meaning you won't experience the hardening or separation that can reduce cooling effectiveness over time. The inclusion of four 25g packets provides flexibility for multiple CPU applications or system upgrades without waste.

The practical design considers user experience from application to performance. The paste's ideal consistency makes it accessible even for beginners, though experienced builders will appreciate its reliability. For budget-conscious PC enthusiasts, overclockers, and anyone performing routine thermal maintenance on gaming rigs or workstations, this product delivers functional thermal management at a reasonable price point. The main consideration is that actual performance will depend on proper application technique and your specific cooling hardware configuration.

Surface Preparation

Before applying thermal paste, ensure both the CPU/GPU surface and heatsink base are clean and dry. Use isopropyl alcohol and a lint-free cloth to remove any old paste, dust, or debris. Allow surfaces to dry completely before proceeding.

Application Methods

For optimal coverage, apply a small amount (rice grain to pea-sized) directly to the center of the processor. The pressure from mounting your cooler will spread the paste across the entire surface. Alternatively, you can apply thin lines in an X pattern for larger processors. Avoid over-application, as excess paste can overflow and potentially contact surrounding components.

Mounting and Pressure

Mount your heatsink or water block according to manufacturer specifications, applying even pressure across all mounting points. The paste's ideal consistency will distribute evenly under proper mounting pressure. Ensure all mounting hardware is secure to maintain consistent contact between surfaces.

Curing Time

Allow the system to run for 30-60 minutes after initial application. The paste reaches optimal thermal conductivity as it settles. Monitor temperatures during this period to confirm the cooler is functioning properly.

Who Should Buy This Product

The HY-510 is ideal for PC builders replacing thermal paste during cooler maintenance, overclockers seeking cost-effective thermal solutions, and anyone upgrading their cooling system. It's particularly suitable for users prioritizing safety and non-conductive formulas.

When to Replace Thermal Paste

Thermal paste typically requires replacement every 3-5 years during normal use, or sooner if you notice elevated CPU/GPU temperatures. Overclocked systems may benefit from more frequent reapplication. The four 25g packets provide enough material for multiple applications.

Compatibility Considerations

This paste works with all standard heatsink types including air coolers, AIO liquid coolers, and custom loop systems. It's compatible with Intel and AMD processors, NVIDIA and AMD graphics cards, and various chipset components. Verify your cooler's mounting mechanism to ensure proper installation.

Performance Expectations

The 1.93 W/m-k rating indicates solid thermal performance suitable for standard and moderately overclocked systems. Results depend on cooler quality, case airflow, and application technique. This paste excels in reliability and safety rather than extreme performance benchmarks.

ARCTIC MX-7 represents a significant advancement in thermal paste technology, specifically engineered for users who demand maximum performance and reliability. The formula's high filler content and dense viscosity deliver exceptional thermal conductivity, making it particularly effective for high-end CPUs, graphics cards, and gaming consoles that generate substantial heat. Whether you're building a high-performance gaming PC or maintaining professional workstation equipment, this paste is formulated to handle demanding thermal loads consistently.

The standout feature of MX-7 is its long-term stability and resistance to common thermal paste degradation issues. Unlike standard pastes that can pump out from cooler pressure, dry out over time, or bleed away from the application site, MX-7 maintains cohesion through repeated thermal cycles. This means you won't need to reapply thermal paste as frequently, saving time and money over the lifespan of your equipment. The paste's non-conductive and non-capacitive properties provide complete peace of mind when working with sensitive electronics, eliminating any risk of electrical discharge or component damage.

Application is straightforward once you understand the design philosophy: MX-7 cannot be manually spread because it's engineered to self-level under cooler pressure. This is actually a significant advantage because it prevents the air bubbles and uneven coverage that can occur with manual application. Simply apply a small amount to the heat source, mount your cooler with normal pressure, and the paste distributes itself perfectly. The 8-gram tube provides enough material for multiple applications, making it economical for enthusiasts who regularly maintain or upgrade their systems.

Preparation: Before applying MX-7, clean the CPU or GPU heat spreader and the cooler's base plate thoroughly. ARCTIC offers an MX Cleaner product specifically designed for removing old thermal paste and preparing contact surfaces for optimal performance.

Application Steps: Apply a small amount of MX-7 directly to the center of the heat spreader. Do not attempt to spread the paste manually. Mount your cooler using normal pressure and mounting hardware. The paste will self-level and distribute evenly under the cooler's weight and contact pressure, creating a thin, uniform bond line without air pockets.

Optimal Amount: A pea-sized to rice-grain-sized amount is typically sufficient for CPUs. For larger GPUs, use slightly more but avoid excessive application. The self-leveling design means less is often more. Allow 24 hours for the paste to fully cure before subjecting your system to heavy thermal loads.

What Makes MX-7 Different: ARCTIC MX-7 occupies the premium segment of thermal paste offerings. Its key differentiators include the self-leveling application mechanism, exceptional long-term stability, and the company's focus on preventing common failure modes like pump-out and dry-out. The non-conductive formula is standard among quality thermal pastes but remains essential for safe application.

Best For: MX-7 is ideal for enthusiasts who want a set-it-and-forget-it solution that won't degrade quickly. It's particularly valuable for high-performance systems that run hot, gaming consoles that experience thermal cycling, and professional workstations where downtime is costly. The 8-gram tube makes it economical for users who frequently upgrade or maintain multiple systems.

When to Consider Alternatives: If you're building a budget system and thermal performance is less critical, more affordable thermal pastes may suffice. If you prefer traditional manual application and enjoy spreading paste yourself, other products offer that experience. However, for maximum reliability and performance, MX-7 delivers exceptional value for the price point.

Thermal Grizzly Kryonaut represents the pinnacle of thermal paste engineering, specifically formulated for users who demand maximum heat dissipation under extreme conditions. The nano-aluminum and zinc oxide particle structure fills microscopic surface irregularities on CPU and GPU dies, creating superior thermal contact and dramatically improving heat transfer efficiency. This composition allows Kryonaut to maintain consistent performance across a remarkable temperature range from -250°C to 350°C, making it equally effective for liquid nitrogen overclocking or standard high-performance cooling setups.

What sets Kryonaut apart from conventional thermal pastes is its non-curing formula that resists hardening even when exposed to sustained high temperatures around 80°C. This stability translates to long-term reliability without performance degradation, and proper storage in the original protective packaging extends usable life to 3 years or beyond. The included precision spatula and detailed application methodology emphasizing slow, deliberate spreading ensures even distribution and maximum thermal contact, though success depends on thorough surface preparation and careful technique from the user.

The 1-gram syringe size balances portability with sufficient capacity for multiple CPU or GPU applications, making it ideal for enthusiasts who experiment with different cooling solutions or perform regular maintenance. Universal socket compatibility spans all modern Intel and AMD processors, discrete graphics cards, and even console platforms, while the non-conductive electrical properties protect sensitive electronics. For overclockers, competitive gamers, and anyone serious about thermal management, Kryonaut's proven performance and market reputation justify the premium investment.

Surface Preparation

Clean the CPU or GPU die thoroughly with isopropyl alcohol or dedicated thermal paste cleaner to remove all old paste residue and oils. The surface must be completely free of grease and contaminants before applying new paste. Allow the cleaned surface to dry completely and reach room temperature before proceeding.

Application Process

Apply a small amount of Kryonaut to the center of the processor die. Using the included spatula, spread the paste very slowly across the entire surface with a single, deliberate motion lasting approximately 3 seconds for standard Intel or AMD CPUs. Slower spreading ensures even distribution and eliminates air pockets that reduce thermal contact.

Storage and Longevity

Always store Kryonaut in its original protective packaging, which features special UV-blocking interior coating that prevents degradation from light and environmental exposure. With proper storage, the paste remains effective for 3 years or longer without requiring replacement. Ensure the cap is sealed tightly between applications to maintain optimal viscosity and performance characteristics.

Note: Temperature Delta (ΔK) represents thermal performance, with lower values indicating superior heat dissipation. Kryonaut offers the best balance of extreme cooling performance and overclocking suitability in the 1-gram category.

Why can't I find thermal conductivity values on the packaging?

Theoretical thermal conductivity values vary significantly based on application conditions including contact pressure, temperature, surface texture, and material properties. Thermal Grizzly focuses on real-world performance metrics rather than theoretical specifications that don't account for these critical variables.

How long does Kryonaut last after opening?

With proper storage in original packaging and a sealed cap, Kryonaut remains usable for at least 3 years, and often significantly longer. The special UV-blocking interior coating protects the paste from degradation caused by light and environmental exposure.

My thermal paste won't spread smoothly. What should I do?

Ensure the surface is thoroughly cleaned and completely free of old paste and oils. The paste must reach room temperature before application. Most importantly, spread very slowly with steady pressure, taking approximately 3 seconds for a single spreading motion across the die.

Is Kryonaut electrically conductive?

No. Kryonaut has zero electrical conductivity (0 pS/m), making it completely safe for sensitive electronics and electronics near power delivery components. This non-conductive property eliminates risk of short circuits or electrical damage.

ARCTIC MX-4 thermal paste delivers reliable thermal performance through its carbon microparticle composition, which fills microscopic imperfections between processor chips and cooler bases. This design approach ensures efficient heat transfer without the electrical conductivity risks associated with metal-based or liquid metal alternatives, making it a smart choice for protecting valuable PC components during normal operation or moderate overclocking.

The paste's medium viscosity strikes an excellent balance between ease of application and thermal performance. The included spatula tool helps users achieve proper coverage with minimal air pockets, reducing the learning curve for first-time builders. The formula remains stable across a wide temperature range from -50°C to 150°C, providing consistent performance whether your system runs cool or hot.

What sets MX-4 apart is ARCTIC's commitment to authenticity verification and proven formula consistency. The brand's Authenticity Check allows users to confirm they're purchasing genuine product, not counterfeit paste that would underperform and degrade faster. Combined with the competitive price point, this thermal paste represents excellent value for anyone seeking professional-grade thermal management without unnecessary complexity.

Preparation

Before applying ARCTIC MX-4, ensure both the CPU/GPU surface and cooler base are clean and dry. Use a soft, lint-free cloth or isopropyl alcohol to remove any old thermal paste residue.

Application Technique

Place a small amount of MX-4 (approximately pea-sized for CPUs, slightly more for GPUs) in the center of the processor. Use the included spatula to spread the paste in a thin, even layer across the entire surface, working from the center outward. Avoid creating air pockets by applying gentle, consistent pressure.

Mounting the Cooler

Carefully mount your cooler directly onto the paste-covered processor. The pressure from mounting will distribute the paste evenly into microscopic surface cavities. Avoid excessive twisting or lateral movement once the cooler makes contact.

Curing and Performance

Thermal paste reaches optimal performance after the first 24-48 hours of operation as it fully settles into surface imperfections. Monitor temperatures during this break-in period to ensure proper thermal contact.

Who Should Buy ARCTIC MX-4?

This thermal paste is ideal for PC builders, system upgraders, and enthusiasts who want reliable thermal management without complexity. It suits anyone replacing old paste on existing systems or building new PCs with standard cooling solutions.

When to Choose MX-4

Choose MX-4 for standard gaming rigs, workstations, and content creation builds. It's also excellent for moderate overclocking scenarios where thermal performance matters but extreme cooling isn't required. The non-conductive formula makes it the safer choice when working with high-end components.

When to Consider Alternatives

If you're pursuing extreme overclocking with custom water cooling loops and need maximum thermal performance, liquid metal alternatives might provide marginal gains. However, for 99% of users, MX-4 delivers all the thermal performance needed at a fraction of the cost and complexity.

Coverage and Longevity

The 4g tube provides enough paste for approximately 1-2 CPU applications or multiple GPU applications. The formula remains stable for several years under normal operating conditions, though reapplication every 3-5 years is recommended for systems in heavy use.

Dow Corning 340 represents a professional thermal management solution designed for applications where reliability and performance cannot be compromised. This silicone-based compound combines high thermal conductivity with exceptional stability, making it suitable for industrial electronics, computer CPU cooling, and PCB assemblies that operate in demanding thermal environments. The 0.67 W/mK thermal conductivity rating ensures efficient heat transfer from heat-generating components to heat sinks or chassis, directly improving device longevity and performance.

What sets this compound apart is its non-flowing, non-curing design that eliminates common headaches associated with thermal pastes. Unlike liquid compounds that spread unpredictably or pastes requiring oven curing, Dow Corning 340 stays precisely where applied and begins working immediately. The low bleed characteristic is particularly valuable for sensitive electronics, as it prevents oil migration that can lead to corrosion or electrical failures. The formula maintains its consistency up to 177°C, ensuring stable performance in high-temperature applications where lesser compounds would break down.

The compound's high dielectric strength of 210 V/mil and exceptional volume resistivity make it safe for use near electrical circuits, while the one-part formulation eliminates mixing steps and potential contamination. Whether you're cooling a CPU, thermally coupling transistors, or managing heat in industrial rectifiers, this compound delivers the professional-grade performance and long-term reliability that serious applications demand. The 5oz tube provides sufficient quantity for multiple installations or maintenance applications.

Surface Preparation: Clean both the component base and heat sink surface with a lint-free cloth to remove dust and debris. For best results, use isopropyl alcohol to remove any existing residue or old compound.

Application Process: Apply a thin, even layer of Dow Corning 340 directly to either the component base or heat sink surface. A small amount goes a long way due to the compound's high thermal conductivity. Use a spreader or plastic applicator to distribute evenly, then firmly press the heat sink onto the component to ensure good contact and eliminate air pockets.

Optimal Coverage: The goal is complete contact between surfaces with minimal excess compound. Too much paste can reduce thermal conductivity; too little creates air gaps that trap heat. For CPUs and large components, a thin layer roughly the thickness of a credit card works well. For transistor leads and small components, apply only enough to coat the mounting surface.

Curing and Use: Unlike many thermal compounds, Dow Corning 340 requires no curing time. Your assembly is ready for operation immediately after mounting. The compound will maintain its properties throughout the device's operating life, with consistent performance up to 177°C.

Who Should Buy This Product: Dow Corning 340 is ideal for professionals, industrial technicians, and serious hobbyists who prioritize reliability and performance. If you're building high-end computer systems, maintaining industrial equipment, or working with sensitive electronics that require professional-grade thermal management, this compound delivers.

Comparison to Alternatives: Budget thermal pastes often contain fillers that degrade over time or bleed oils that contaminate circuits. Liquid thermal compounds can spread unpredictably and require careful application. Dow Corning 340 splits the difference with a stable, non-flowing paste that won't migrate or degrade, backed by decades of industrial use and trust.

When to Choose Dow Corning 340: Select this compound when working with components that generate significant heat, operate in hot environments, or require long-term reliability without maintenance. It's particularly valuable for applications where component replacement is difficult or expensive, as the superior thermal performance extends component lifespan. The 5oz tube provides excellent value for technicians who handle multiple projects or need a reliable supply on hand.

Storage and Shelf Life: Store in a cool, dry place away from direct sunlight. The compound remains stable for years when properly sealed, making it practical to keep on hand for future projects.

The SpinLaLa HY880 thermal paste represents a practical choice for budget-conscious PC builders seeking reliable thermal management. With a thermal conductivity rating of 5.15 W/mK, this compound effectively transfers heat away from processors and graphics cards to their coolers. The 10-pack format provides excellent value, offering enough paste for multiple systems or extended use without frequent repurchasing. Each 1-gram syringe is pre-measured, eliminating guesswork during application.

Performance characteristics are well-suited for standard computing and gaming scenarios. The paste maintains stability across a broad temperature range from -30°C to 280°C, making it suitable for both air and liquid cooling setups. The high dielectric strength rating above 10,000 volts provides peace of mind regarding electrical safety, protecting sensitive motherboard components from potential damage. The formula's consistency strikes a good balance, allowing even application for users of all skill levels without requiring specialized tools or techniques.

While the HY880 won't match the thermal performance of premium compounds or liquid metal solutions, it delivers dependable results at a fraction of the cost. The main consideration is ensuring syringes are properly sealed after use to prevent drying. For system builders replacing thermal paste during maintenance, upgrading coolers, or building multiple computers, this bundle offers practical value and reliable heat dissipation performance.

Preparation: Before applying thermal paste, power down your system completely and allow it to cool. Remove the existing cooler and clean the CPU or GPU surface with isopropyl alcohol and a lint-free cloth. Allow the surface to dry completely before proceeding.

Application Method: Apply a small amount of paste (roughly the size of a rice grain to a pea) directly to the center of the processor. Do not spread the paste manually. Instead, mount the cooler directly onto the CPU, allowing the mounting pressure to distribute the paste evenly across the entire surface. Excess paste will be squeezed out the sides, which is normal.

Best Practices: Avoid using too much paste, as excess compound can overflow onto the motherboard and potentially cause electrical issues. Store unopened syringes in a cool, dry place away from direct sunlight. Once opened, ensure the syringe cap is tightly sealed to prevent the paste from drying out. Replace thermal paste every 3-5 years or when you notice elevated CPU temperatures during normal operation.

Who Should Buy This Product: The SpinLaLa HY880 is ideal for PC builders replacing thermal paste during regular maintenance, anyone upgrading their CPU cooler, or enthusiasts building multiple computers. It's also suitable for console modders and anyone working with electronics requiring reliable thermal management on a budget.

When to Upgrade to Premium Options: If you're building a high-end gaming or workstation PC with extreme overclocking plans, consider premium thermal pastes with higher conductivity ratings (7+ W/mK) or liquid metal solutions. These options provide marginal performance gains but at significantly higher cost.

Storage and Shelf Life: Keep thermal paste in a cool environment and avoid extreme heat exposure. Sealed syringes maintain usability for extended periods when stored properly. Once applied to a system, thermal paste gradually hardens over years of operation, which is why periodic replacement maintains optimal thermal performance.

The HY700 thermal paste addresses a fundamental cooling challenge: bridging the microscopic gaps between CPU/GPU dies and heatsinks. Its nano-particle structure containing micronized aluminum and zinc oxide particles fills these surface irregularities effectively, creating better thermal contact than traditional pastes. The 3.14 W/m-k thermal conductivity rating is competitive for mid-range thermal compounds, making it suitable for both stock cooling setups and moderate overclocking scenarios.

Durability is a notable strength of this compound. Unlike traditional thermal pastes that dry, harden, or degrade under sustained heat, the HY700 maintains its pliable consistency even at 80C and beyond. This stability translates to consistent performance over months of use without requiring frequent reapplication. The non-conductive formula eliminates a common concern among builders: accidental short circuits from conductive paste residue on the motherboard or components.

From a practical standpoint, the included spatula makes application straightforward for beginners and experienced builders alike. The 50g capacity is appropriate for 3-5 complete CPU applications or multiple GPU thermal pad replacements, though buyers should note this represents one-third of the full bottle size. Overall, the HY700 delivers reliable thermal performance and long-term stability at an accessible price point, making it a solid choice for PC maintenance and upgrade projects.

Preparation

Clean the CPU or GPU die and heatsink base plate thoroughly with isopropyl alcohol and a lint-free cloth. Remove any old thermal paste completely. Allow surfaces to dry fully before application.

Application Process

Apply a small pea-sized amount of HY700 paste to the center of the CPU die or GPU. Use the included spatula to spread it evenly across the entire surface in a thin, uniform layer. Avoid excessive paste, which can reduce thermal contact and create mess. Mount the heatsink or cooler according to manufacturer specifications, applying firm, even pressure.

Best Practices

For optimal results, reapply thermal paste during routine maintenance or if you notice temperature increases. The paste maintains stability long-term, but replacement every 2-3 years is standard practice for thermal compounds. Store in a cool, dry location away from direct sunlight to preserve consistency.

Compatible Platforms

The HY700 works with all modern CPU and GPU platforms including Intel (LGA 1150 through LGA 1700), AMD Ryzen (AM4, AM5), and NVIDIA/AMD discrete graphics cards. It is also suitable for PS5 thermal maintenance and other gaming console cooling applications.

Ideal Use Cases

• Stock CPU cooling system upgrades and maintenance
• Moderate overclocking projects requiring reliable thermal transfer
• GPU thermal pad replacement and cooling optimization
• Chipset cooler applications and system maintenance
• Gaming console thermal management
• PC builders seeking non-conductive, long-lasting compounds

Not Recommended For

Extreme overclocking scenarios demanding maximum thermal performance may benefit from premium compounds with higher conductivity ratings. If you require the absolute lowest thermal resistance, evaluate higher-tier thermal pastes designed specifically for competitive overclocking.