Arctic MX-4 (Carbon-Based/8.5 W/mK/Non-Conductive/Proven Budget Legacy Pick/98,000+ Positive Reviews)
- Model:
- Arctic MX-4
- Compound Type:
- Carbon-Based
- Thermal Conductivity:
- 8.5 W/mK
- Electrical Conductivity:
- Non-Conductive
- Package Size:
- 4g / 8g / 20g / 45g tubes
- Recommended Use:
- Mainstream CPU/GPU (builds on a tight budget)
- Reapplication Interval:
- Up to 8 years
- Safety Notes:
- None
Consumercarts is reader-supported. Learn more
Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.
Manufacturer: Arctic Last updated: September 10, 2026
Description
The Arctic MX-4 is the long-running predecessor to the MX-6 covered elsewhere on this site, and despite being succeeded by a genuinely improved formula, it remains a widely recommended budget pick backed by an enormous, proven track record of over 98,000 positive reviews. For mainstream CPUs that don't demand premium-tier thermal performance, this paste continues to deliver reliable, well-tested results at the lowest realistic price point in the non-liquid-metal category.
The Arctic MX-4 is the long-running predecessor to the MX-6 covered elsewhere on this site, and despite being succeeded by a genuinely improved formula, it remains a widely recommended budget pick backed by an enormous, proven track record of over 98,000 positive reviews. For mainstream CPUs that don't demand premium-tier thermal performance, this paste continues to deliver reliable, well-tested results at the lowest realistic price point in the non-liquid-metal category.
Thermal Performance and Conductivity
In direct comparative testing, MX-4 measured a modest but real 1.5°C behind the top-performing compound tested, a gap that's genuinely negligible for mainstream CPUs like a Core i5 or Ryzen 5 that don't generate enough sustained heat to make that difference meaningful in practice. Current guides specifically recommend MX-4 for exactly this CPU tier, noting these chips don't need premium paste to achieve excellent results.
Compound Type and Composition
As a carbon-based, non-metallic compound, MX-4 shares the same fundamental safety profile as its MX-6 successor: fully non-conductive, safe for less experienced builders, and free of the short-circuit risk that comes with metal-based or liquid-metal alternatives.
Application and Consistency
MX-4's application profile is well-documented across a decade of widespread use, with an extensive body of user experience confirming consistent, predictable spreading behavior under cooler mounting pressure, a genuine advantage of a product with this much real-world track record behind it.
Electrical Safety
Fully non-conductive composition means MX-4 carries no risk of shorting components even with an imperfect application, the same safety profile that's made the broader Arctic MX line a standard recommendation for cautious or first-time builders for years.
Longevity and Pump-Out Resistance
While MX-6 specifically improved on pump-out resistance over this MX-4 formula, MX-4 still offers solid multi-year longevity appropriate for mainstream builds that aren't opened and repasted frequently, though buyers specifically prioritizing the longest possible interval between applications should consider stepping up to MX-6 instead.
Comparison to Sibling Products
Against the Arctic MX-6, covered elsewhere on this site, that paste delivers a measured 20% thermal resistance improvement and better pump-out resistance for only a small price increase, generally the smarter buy for anyone not on the absolute tightest budget. Against Thermal Grizzly Kryonaut, also covered elsewhere on this site, that premium paste outperforms MX-4 by a real but modest margin, a difference that matters more for high-TDP flagship CPUs than for the mainstream chips MX-4 is best suited to.
Who This Paste Is Actually For
**Mainstream CPU builds on the tightest thermal-paste budget.** Current guides specifically recommend this tier of paste for chips like a Core i5 or Ryzen 5. **Buyers who value an extremely long, proven track record over the newest formula.** Few thermal pastes have this much accumulated real-world usage data behind them. **Not for flagship or heavily overclocked CPUs.** Arctic's own MX-6, or Thermal Grizzly Kryonaut, both covered elsewhere on this site, deliver meaningfully better performance where that headroom actually matters. **Not for buyers who want the longest possible interval between repasting.** MX-6's improved pump-out resistance is the better choice for that specific priority.
Specifications
| Brand | Arctic |
|---|---|
| Model | Arctic MX-4 , MX-4 |
| Compound Type | Carbon-Based |
| Thermal Conductivity | 8.5 W/mK |
| Electrical Conductivity | Non-Conductive |
| Package Size | 4g / 8g / 20g / 45g tubes |
| Recommended Use | Mainstream CPU/GPU (builds on a tight budget) |
| Reapplication Interval | Up to 8 years |
| Safety Notes | None |
Expert Review
Rated by the Consumercarts editorial team, not by users
Best for
- Mainstream CPU builds on the tightest thermal-paste budget. Current guides specifically recommend this tier of paste for chips like a Core i5 or Ryzen 5.
- Buyers who value an extremely long, proven track record over the newest formula. Few thermal pastes have this much accumulated real-world usage data behind them.
Not for
- Not for flagship or heavily overclocked CPUs. Arctic's own MX-6, or Thermal Grizzly Kryonaut, both covered elsewhere on this site, deliver meaningfully better performance where that headroom actually matters.
- Not for buyers who want the longest possible interval between repasting. MX-6's improved pump-out resistance is the better choice for that specific priority.