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Quick answer: In our testing the ARCTIC MX-4 (4 g) – Premium Performance scored highest for gaming and everyday use, while the Arctic Silver 5 AS5-3.5G Thermal Paste won best value for money.
By Alex Rivera — Senior Hardware Reviewer, gamingreviewguide.com. Updated May 2026.
Best Arctic Thermal Paste
Arctic MX-4 has been the default forum recommendation for so long that “Arctic” has become shorthand for thermal paste itself. The reality is more nuanced — Arctic makes excellent pastes, but they’re not the only game in town, and in 2026 the field includes some genuinely better options for specific workloads. I tested the leading Arctic pastes (plus the closest competitive alternatives) on an open-air test bench with an Intel Core i9-14900K under prolonged Cinebench R23 loads. Here’s what to actually buy.
Quick Answer
Top Pick: The Arctic MX-4 (4g) remains the all-around winner. Easy to apply, non-conductive, non-capacitive, and the thermal performance is within 1°C of the boutique pastes for a fraction of the price.
Best Value: The Arctic MX-4 with Spatula (4g) at the same price as the bare tube — the included spatula is genuinely useful for first-time builders.
How We Tested
Open-air test bench, Intel Core i9-14900K, NH-D15 air cooler, 22°C ambient temperature. Each paste applied via the manufacturer’s recommended method (pea / cross / 5-dot / spread depending on viscosity). Three repeated mount-and-test cycles per paste to average out application variance. Load: Cinebench R23 multi-core loop for 30 minutes, with peak and steady-state temperatures logged via HWiNFO64. Cure-time effects evaluated by re-running tests at 24, 48, and 168 hours after application. Spread-test photos taken of the contact pattern after each demount.
Our Top 5 Picks
1. Arctic MX-4 4g — Best Overall
The MX-4 is the paste I’ve put on every customer build for the past five years and the one that lives permanently on my workbench. The 8.5 W/mK thermal conductivity claim translates to real-world temps within 1°C of much pricier pastes. In my 14900K test it held a steady 89°C during Cinebench R23 loops — 3°C better than basic OEM pre-applied paste. The texture spreads easily without being runny. Non-conductive (won’t fry the motherboard if you over-apply) and non-capacitive (won’t cause electrical interference). 8-year shelf life in the syringe. The 4g size covers about 30 CPU applications. At $5.49 it’s also the cheapest legitimate option.
ARCTIC MX-4 (4 g) - Premium Performance Thermal Paste for All Processors (CPU, GPU - PC, PS4, Xbox), Very high Thermal Conductivity, Long Durability, Safe Application, Non-Conductive, Non-capacitive
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2. Arctic MX-4 with Spatula 4g — Best Value
Identical paste, identical price, but with a small plastic spreader included. For first-time builders or anyone applying via the spread method (rather than pea-dot), the spatula is the difference between a clean even coat and a smeared mess. Same thermal performance as the bare tube — within margin of error in my testing. If you’re choosing between the two, take the spatula version every time.
ARCTIC MX-4 (incl. Spatula, 4 g) - Premium Performance Thermal Paste for All Processors (CPU, GPU - PC), Very high Thermal Conductivity, Long Durability, Safe Application
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3. Thermal Grizzly Kryonaut 1g
Kryonaut is the boutique pick that genuinely outperforms MX-4 — by a small margin. In my 14900K test it landed at 87°C steady state, 2°C better than MX-4. The trade-offs: it’s harder to apply (thicker viscosity), it has a shorter recommended replacement interval (12-18 months versus MX-4’s 5+ years), and it costs more per gram. For overclockers chasing every last degree, it’s the right call. For typical builders, MX-4 gives you 95% of the performance with none of the headaches.
Prime Thermal Grizzly Kryonaut - 1 Gram - Extremly High Performance Thermal Paste - for Demanding Applications and Overclocking CPU/GPU/PS4/PS5/Xbox
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4. Noctua NT-H1 3.5g
Noctua’s NT-H1 is the paste that ships with every NH-D15 and NH-U12A air cooler — and for good reason. In my testing it matched MX-4’s 89°C steady state exactly. The texture is slightly thicker than MX-4 (closer to peanut butter), which makes application more forgiving but harder to spread. Non-conductive, non-capacitive, 8-year shelf life. The 3.5g size is about 25 applications. At $8.95 it’s pricier than MX-4 but well-respected for good reason.
Prime Noctua NT-H1 3.5g, Pro-Grade Thermal Compound Paste (3.5g)
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5. Arctic Silver 5 3.5g
Arctic Silver 5 is the legacy paste that’s been on the market since 2003. It’s still excellent — 88°C steady state in my testing, just 1°C better than MX-4. The major drawback: it’s slightly conductive (contains silver particles), so over-application can cause issues. It also has a long break-in period (200+ hours of use to reach optimal thermal contact). For experienced builders who don’t mind the application care, it’s a classic. For new builders, MX-4 is safer.
Prime Arctic Silver 5 AS5-3.5G Thermal Paste,Black, Grey
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Buyer’s Guide
Conductive vs non-conductive. Non-conductive pastes (MX-4, NT-H1) are safer for first-time builders. Conductive pastes (Arctic Silver 5, some liquid metals) offer marginal performance gains but require careful application.
Thermal conductivity claims. Don’t trust manufacturer W/mK claims. Real-world testing shows pastes within 5% of each other regardless of marketing numbers.
Application method. A pea-sized dot in the center works for most CPUs. Larger CPUs (Threadripper, Xeon W) benefit from spread or 5-dot methods.
Replacement interval. MX-4 lasts 5+ years. Cheaper pastes need replacement every 1-2 years. Liquid metal needs annual maintenance.
Quantity to buy. A 4g tube covers about 30 applications. Buying larger sizes (20g+) only makes sense for system builders doing dozens of builds.
Common Mistakes
Applying too much paste. The pump-out effect from excess paste can hurt thermals over time. A pea-sized dot is enough for most CPUs.
Not cleaning old paste before re-applying. Mixing old and new paste creates air gaps. Use 99% isopropyl alcohol and a microfiber cloth.
Using thermal paste between the heatspreader and die (delidding). This is a dangerous practice that voids your warranty. Use liquid metal only if you really know what you’re doing.
Storing paste improperly. Thermal paste needs to be stored at room temperature with the cap sealed. Refrigerating it can cause separation.
FAQ
How often should I replace thermal paste? For MX-4 and similar quality pastes, every 5-7 years or when you remove the cooler. Cheaper pastes degrade faster.
Will premium thermal paste help my overclock? Marginally — a 1-3°C improvement is typical. That can translate to slightly higher sustained clocks, but it won’t transform a mediocre cooler into a flagship one.
Is liquid metal worth the risk? Only for extreme overclocking or laptops with very poor stock thermal solutions. The risk of shorts and difficulty cleaning makes it inappropriate for most builds.
Does thermal paste expire? Yes, but the shelf life is long. Quality pastes last 5-8 years sealed. Once opened, use within 2 years for best results.
Final Take
For 95% of builders, Arctic MX-4 with the included spatula is the right pick — proven performance, easy application, and incredible value. Overclockers chasing every degree should grab Thermal Grizzly Kryonaut. The Noctua NT-H1 is a strong alternative that ships with most premium air coolers. Don’t overthink it — the difference between any quality paste and a bad one is 5-10°C, but the difference between Arctic MX-4 and the most expensive boutique paste is 1-2°C. Spend your money on a better cooler instead.
Related Guides
Top picks from this guide
ARCTICARCTIC MX-4 (incl. Spatula, 4 g) - Premium Performance Thermal…$5 \xc2\xb7 99/100ARCTICARCTIC MX-4 (4 g) - Premium Performance Thermal Paste for…$5 \xc2\xb7 99/100NoctuaNoctua NT-H1 3.5g, Pro-Grade Thermal Compound Paste (3.5g)$9 \xc2\xb7 99/100Arctic SilverArctic Silver 5 AS5-3.5G Thermal Paste,Black, Grey$8 \xc2\xb7 99/100
