8 Best Thermal Pastes for Server CPUs (November 2026) Buying Guide

Continuous workloads can expose weak heat transfer between a server CPU and its cooler, especially in systems that stay powered on for long stretches. The Best Thermal Pastes for Server CPUs balance safe application, durability, and effective gap filling. It also helps to know whether your CPU cooler includes thermal paste before starting a build or service job.

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StarTech Metal Oxide Thermal Paste 5-Pack

Product Group Personal Computer

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For builders who service several systems, this five-pack format is the main appeal: it provides five separate re-sealable syringes rather than one larger container. StarTech describes the compound as metal oxide thermal paste for CPU and GPU use, with 1.5g in each syringe. That makes it a practical option for keeping individual applications portioned and ready for later maintenance. The listing does not state a thermal-conductivity rating or electrical-conductivity classification, so performance comparisons and handling requirements cannot be confirmed from the available details. It is best suited to shoppers who specifically want multiple small syringes.

Pros & Cons

Includes five re-sealable syringes
Suitable for CPU and GPU thermal paste applications
Clearly identified as a metal oxide compound
Individual 1.5g portions are convenient for multiple projects

Thermal-conductivity rating is not listed
Electrical-conductivity classification is not listed
The listing provides limited technical formulation details

-24%

Thermal Grizzly Kryonaut 1 Gram

Type Not specified

Thermal Conductivity Not specified

Electrical Conductivity Not specified

Syringe Size 1 Gram

~~$11.90~~ Save $2.91

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Built for demanding cooling jobs and overclocking-focused builds, Thermal Grizzly Kryonaut is positioned as an extremely high-performance thermal compound for CPUs, GPUs, and game consoles. The 1 Gram format makes it a compact choice for a targeted application, such as a processor repaste or console maintenance project. Amazon places it in the Silicon Grease category, but the listing does not provide a thermal-conductivity rating or electrical-conductivity information. It is marketed for CPU, GPU, PS4, PS5, and Xbox use, making it relevant for enthusiasts maintaining a range of heat-producing hardware.

Pros & Cons

Marketed specifically for demanding thermal applications
Compatible use cases listed for CPU, GPU, PS4, PS5, and Xbox
Compact 1 Gram format suits single-system maintenance
Strong enthusiast-oriented positioning for overclocking

Thermal-conductivity rating is not specified in the listing
Electrical-conductivity information is not specified
A 1 Gram quantity may be limiting for users servicing several systems

-12%

Corsair TM30 Thermal Paste 3g

Size 3 grams

Product Group Personal Computer

~~$7.99~~ Save $0.99

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Built for CPU and GPU cooling, Corsair's TM30 targets users who want a straightforward repaste with an included applicator. The listing positions it as a silicon grease with ultra-low thermal impedance, although it does not provide a thermal-conductivity value. Its 3-gram package is clearly identified for desktop use, making the amount easy to compare with other compounds. Electrical conductivity is not specified, so shoppers who need that safety detail should verify it before buying. It is a sensible fit for desktop builders seeking a named CPU/GPU compound without relying on unsupported performance claims.

Pros & Cons

Supports both CPU and GPU thermal-paste applications
Includes an applicator
Ultra-low thermal impedance is stated in the product title
Clearly labeled 3-gram package

Thermal-conductivity rating is not specified in the provided listing
Electrical conductivity information is not specified
The provided data does not describe the compound's consistency or cure behavior

COXBYTE TG-25 Thermal Paste 2g

Size TG25,2g

Product Group Personal Computer

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For PC builders who want a straightforward, electrically safer alternative to conductive compounds, COXBYTE TG-25 is positioned for CPU and GPU cooling in desktops, laptops, and servers. Its listed 13.8W/m-K thermal conductivity gives shoppers a clear performance specification to compare against other pastes. The non-conductive formula is a practical benefit when applying paste near small components. You get a 2g syringe and spatula, so there is enough material for more than one careful application depending on coverage and hardware size. COXBYTE also lists 5+ year longevity, although viscosity and curing details are not provided.

Pros & Cons

High 13.8W/m-K thermal conductivity is clearly stated in the listing.
Non-conductive design is suitable for users who prefer to avoid electrically conductive compounds.
Works across CPU and GPU use cases, including desktops, laptops, and servers.
Syringe and spatula are included.

The listing does not specify the paste formulation or viscosity.
A 2g syringe may be limiting for frequent rebuilds or multiple large systems.
No detailed technical specifications beyond the headline claims are provided.

COXBYTE TG-30 Thermal Paste 20g

Size TG30,20g

Product Group Personal Computer

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High heat-transfer potential is the main draw of COXBYTE TG-30, a non-conductive thermal grease listed at 17.5W/m-K. Its 20g size makes it a practical option for builders, repair shops, or anyone maintaining several CPUs, GPUs, laptops, or servers instead of buying a small single-use amount. The product listing also claims 5+ year longevity, which may appeal to users planning long-term installations. Electrical safety is a welcome part of the design since the paste is described as non-conductive. The listing does not specify the applicator or syringe format.

Pros & Cons

High listed thermal conductivity of 17.5W/m-K.
Non-conductive formulation.
Generous 20g package for multiple applications.
Listed for CPUs, GPUs, laptops, and servers.
5+ year longevity claim in the product title.

The listing does not specify the included applicator or dispensing format.
Composition details and viscosity are not provided.
No customer review feedback is supplied in the available product data.

BSFF 1.8g Thermal Paste with Toolkit

Size 1.8G

Product Group Personal Computer

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A bundled toolkit makes this BSFF paste a practical option for someone preparing to service a CPU, GPU, IC, or heatsink. The listing identifies a 1.8g amount, which should suit a small number of applications, while the included toolkit adds convenience for basic repasting work. It is listed in the Silicon Grease category, but the compound formulation is not specified. Thermal conductivity and electrical conductivity details are also not listed, so buyers cannot directly compare its performance or safety characteristics with more fully documented thermal compounds.

Pros & Cons

Includes a toolkit alongside the thermal paste
Compatible applications are clearly named for CPUs, GPUs, ICs, and heatsinks
1.8g quantity is clearly stated
Compact option for basic repasting projects

Thermal conductivity is not specified
Electrical conductivity information is not specified
The listing does not describe the paste formulation or toolkit contents

-8%

Thermal Grizzly Kryonaut 1g

Product Group Personal Computer

~~$12.99~~ Save $1.00

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Built for demanding cooling jobs and overclocking-focused systems, Thermal Grizzly Kryonaut comes in a compact 1 gram format for CPU, GPU, PS4, PS5, and Xbox applications. The package also includes 12 cleaning wipes, split into six wet and six dry wipes, which is useful when replacing old compound before a fresh application. It is presented as an extremely high-performance thermal paste, though the listing does not state its thermal conductivity, electrical conductivity, or compound type. The small amount makes it best suited to targeted maintenance rather than repeated builds or servicing several machines.

Pros & Cons

Made for demanding applications and overclocking
Works across CPU, GPU, PS4, PS5, and Xbox maintenance
Includes both wet and dry cleaning wipes
Convenient 1 gram amount for a single targeted application

Thermal conductivity is not specified in the listing
Electrical conductivity and compound type are not listed
The 1 gram quantity may be limited for multiple systems or frequent repasting

Thermal Paste Choices for Long-Running Servers

For server maintenance, I would prioritize a non-conductive compound with enough material for the work at hand and a stated long service life. A careful CPU repaste procedure matters just as much as the compound, since old paste and uneven mounting can hurt contact. Thermal Grizzly publishes information on its cooling materials and intended applications.

For several servers, I would go with COXBYTE TG-30. Its large 20g supply is practical for repeat maintenance, while its non-conductive formula, stated five-plus-year longevity, and broad operating range suit machines that run under sustained load.
For a single server or a smaller refresh job, I would point to COXBYTE TG-25. It is specifically listed for servers, comes in a 2g syringe with a spatula, and is non-conductive with claimed long-term stability.
For a demanding configuration where a small syringe is sufficient, I would choose Thermal Grizzly Kryonaut. It is intended for demanding applications, includes a syringe and spatula, and is described as resisting drying at elevated temperatures.

FAQs

1. What makes thermal paste suitable for a server CPU?

A server compound should maintain good contact between the CPU heat spreader and cooler during long operating periods. Non-conductive paste is a sensible choice for many builders because an accidental smear is less likely to create an electrical problem. Durability and a suitable amount of paste also matter for scheduled maintenance.

2. Should I use liquid metal on a server CPU?

Liquid metal can offer strong heat transfer, but it is electrically conductive and requires more care around surrounding components. For most server owners, conventional non-conductive paste is the simpler, lower-risk option. Use a product only where its material compatibility and application requirements are clear.

3. How often should server CPU thermal paste be replaced?

Replacement intervals depend on the paste, workload, cooler mounting, and operating environment. Replace it when servicing the cooler, investigating persistent temperature changes, or after disturbing the heatsink. Before applying fresh compound, follow the basics in our guide on how to repaste a CPU to remove old material properly.

4. Is more thermal paste better for a server processor?

No. The paste fills microscopic imperfections, rather than acting as a thick cooling layer. Applying too much can create unnecessary mess and may interfere with an even heatsink mount. Use a small, controlled amount and let mounting pressure spread it across the CPU surface.

5. Can I use CPU thermal paste on a GPU or chipset?

Many standard thermal pastes are also intended for GPUs and chipsets, but confirm the manufacturer’s stated compatibility first. GPU servicing may involve different pad thicknesses and component layouts than a CPU cooler. For the basics, see whether a GPU comes with thermal paste before taking a card apart.

Editor’s Verdict

For most maintenance work, Best Thermal Pastes for Server CPUs comes down to safe handling and dependable longevity. I would choose COXBYTE TG-30 for its larger supply and non-conductive, long-life formula. For a smaller job, COXBYTE TG-25 offers a practical server-focused alternative.