Replacing dried-out compound is one of the cheapest ways to bring CPU temperatures back down, and the ARCTIC MX-4 has held a spot near the top of that category for years. This 4 g syringe covers multiple builds and works on desktop processors, graphics cards, and laptop heatsinks alike.
Carbon microparticles do the heat lifting here, and because the formula contains no metal, spilled paste near pins or SMDs won’t short anything out. That combination makes an ARCTIC MX-4 thermal paste review worth reading for first-time builders as much as for people who repaste hardware every month.
- 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
The consistency lands somewhere between runny and stiff, so it spreads under cooler pressure without needing a spatula or a heat gun to loosen it.
Bottom Line
If you want a dependable, non-conductive compound that can last through years of thermal cycling, MX-4 is an easy pick. Check current availability and pricing on Amazon.
ARCTIC MX-4 (4 g) Overview
This is a carbon-based compound sold in a 4 g syringe under model number ACTCP00002B, aimed at people who expect to repaste more than once. ARCTIC has revised the packaging several times since the product first appeared, while keeping the compound itself unchanged.
The syringe ships in a slim card package roughly 7.4 inches long, with the plunger already seated so you can dispense it right away. The total compound weight is about 0.14 ounces.
It ranks among the best-selling entries in the thermal paste category on Amazon. It also works with Intel and AMD sockets, discrete GPUs, and laptop cooling assemblies without special preparation.
Heat Transfer Performance for CPUs and GPUs
Carbon microparticles give MX-4 high thermal conductivity, which shows up as lower load temperatures after old paste has been cleared away. Buyers repasting laptops report the most dramatic swings, with throttling machines returning to normal operating ranges after a single application.
Desktop results are more incremental but remain consistent. Owners of modern Ryzen chips, including 7000-series parts, report stable temperatures under sustained load with standard air and AIO coolers.
The compound performs comparably to other premium pastes near the top of the market, and the gap between good compounds is usually only a couple of degrees. Mounting pressure and cooler contact quality still account for most of the result, which is why MX-4 pairs well with a properly seated block on a liquid cooled gaming PC.
Metal-Free Formula and Electrical Safety
No metal content means no electrical conductivity, so paste that squeezes past the IHS edge or lands on a nearby capacitor won’t create a short. That’s a meaningful difference from liquid metal compounds, which demand masking and careful cleanup.
For anyone applying paste for the first time, this removes the biggest failure risk. Overshooting the pea-sized dot or getting a smear on the socket frame becomes a cleanup task rather than a hardware fault.
The same property makes MX-4 sensible for bare-die GPUs and laptop CPUs, where surrounding components sit close to the heat spreader.
Long-Term Reliability After Installation
ARCTIC rates the compound for at least eight years without reapplication, and it resists the drying and cracking that can plague cheaper silicone-based pastes. Long-term owners back this up, reporting stable temperatures two years or more after a single application.
Pump-out is the usual failure mode for compounds exposed to repeated heating and cooling cycles. MX-4 holds its viscosity well enough that most users never repaste unless they change coolers.
The syringe itself stores fine between uses. Cap it, keep it out of direct sun, and the remaining paste should stay workable for future builds.
Application Ease and 4 g Syringe Value
The 4 g size stretches across several applications, and builders regularly get four or more CPU repastes from one syringe. Technicians who service machines for a living treat it as a shop staple for that reason.
Consistency is the practical advantage. It’s thick enough to hold a dot shape and thin enough to spread under cooler pressure, so no manual spreading step is required.
| Detail | Specification |
|---|---|
| Quantity | 4 g |
| Composition | Carbon microparticles, metal-free |
| Electrical conductivity | None |
| Rated lifespan | 8+ years |
| Model number | ACTCP00002B |
Customer Reviews and Purchase Considerations
Feedback runs strongly positive across tens of thousands of buyers, with recurring praise for temperature drops, ease of use, and how far the syringe goes. Reviewers rebuilding older laptops and prebuilt desktops describe the sharpest improvements, since factory paste degrades faster than most people expect.
Several longtime users point to ARCTIC’s newer MX-6 as a step up on paper, though few report meaningful differences in daily use. International reviewers echo the same points about consistency and application ease.
If you’re comparing options, it sits alongside the Noctua NT-H2 thermal paste and Thermal Grizzly Kryonaut in the premium non-conductive tier.
Pros
- High thermal conductivity from carbon microparticles
- Metal-free and non-conductive, safe around pins and components
- Rated for eight years or more without reapplication
- Consistency that spreads easily without a spatula
- 4 g covers multiple CPU or GPU applications
Cons
- MX-6 offers a small measured improvement for a modest price increase
- Not the best absolute performer for extreme overclocking runs
- Syringe has no included spatula or cleaning wipes
Conclusion
MX-4 remains a strong default for anyone repasting a CPU, GPU, or laptop heatsink, and the 4 g syringe removes any reason to ration it. Temperature gains are most obvious when replacing dried factory compound, where drops of ten degrees or more are common.
Choose it when you want proven longevity and zero short-circuit risk. If you’re chasing the last degree on a delidded chip or during a benchmark run, look at liquid metal or MX-6, and keep the MX-4 syringe on the bench for everything else you build. It also pairs naturally with a fresh cooler install, such as the ARCTIC Liquid Freezer III 360 A-RGB.
Frequently Asked Questions
Is ARCTIC MX-4 a good thermal paste for a gaming PC?
Yes, it handles high-wattage gaming CPUs and GPUs without issue. Owners running Ryzen 7000-series and modern Intel chips report stable load temperatures with both air coolers and AIOs.
Can ARCTIC MX-4 be used on a GPU as well as a CPU?
It works on graphics card dies, chipsets, VRM heatsinks, and laptop CPUs. The metal-free formula makes it safe on bare dies where surrounding components sit close to the contact surface.
How long does ARCTIC MX-4 thermal paste last after application?
ARCTIC rates it for at least eight years without reapplication. It resists the drying and cracking common to silicone-based compounds, so most users only repaste when swapping coolers.
Is ARCTIC MX-4 safe if paste spreads near CPU contacts?
Yes, the compound contains no metal and does not conduct electricity, so excess paste on the socket frame or nearby capacitors will not cause a short. Wipe it off with isopropyl alcohol and proceed with the install.
How many applications can a 4 g syringe of ARCTIC MX-4 provide?
Expect four or more standard desktop CPU applications from a single 4 g syringe. Larger heat spreaders on high-core-count processors use more per application, while GPU dies use noticeably less.
Is ARCTIC MX-4 or MX-6 the better choice?
MX-6 measures slightly cooler on paper, usually by a degree or two. MX-4 costs less and has a longer track record, so it’s the practical choice unless you’re tuning a system where every degree counts.
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