Best Thermal Paste for Steam Deck
If you’ve spent any significant time with the Steam Deck, you know that while it’s a marvel of handheld engineering, it can get notoriously toasty during a session of Cyberpunk 2077 or Elden Ring. Thermal throttling and that high-pitched fan whine are common complaints for power users. Having modded dozens of handhelds and high-end workstations, I’ve found that the stock thermal interface is often the bottleneck. My testing points to the Honeywell PTM7950 as the undisputed champion for this specific APU.
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Best Thermal Paste for Steam Deck: Detailed Reviews
Honeywell PTM7950 View on Amazon
The Honeywell PTM7950 isn’t technically a “paste” in the traditional sense, but a phase-change pad that turns into a liquid once it reaches 45°C. For the Steam Deck’s Aerith APU, this is a game-changer. Unlike traditional pastes that suffer from the “pump-out effect” on small, direct-die chips, PTM7950 stays exactly where it’s needed. In my personal Deck, I saw a sustained 7°C drop in temperature during heavy loads, which allowed the fan to spin much quieter. It is remarkably durable; once applied, you won’t need to worry about it drying out for years. The only real downside is the application process. Because it’s a thin film, it can be a bit finicky to peel and place without tearing. I highly recommend putting the pad in the fridge for 10 minutes before applying to make it easier to handle. It’s the gold standard for laptop and handheld modders.
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Arctic MX-6 View on Amazon
Arctic MX-6 is the successor to the legendary MX-4, and it brings a significant 20% improvement in thermal resistance. What makes it particularly suitable for the Steam Deck is its high viscosity. On small chips without an integrated heat spreader, thinner pastes tend to get “pumped out” by the thermal expansion and contraction of the heatsink. MX-6 is thick enough to resist this, ensuring long-term stability. You’ll find it very easy to apply using the pea-dot method. It’s non-conductive and non-capacitive, meaning if you’re a bit messy with the application and some spills onto the surrounding capacitors, your Steam Deck won’t short-circuit. While it doesn’t quite match the sheer thermal conductivity of PTM7950, it is much more affordable and widely available. It’s a “set it and forget it” solution that offers a noticeable upgrade over the factory-applied grease without breaking the bank.
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Arctic MX-4 View on Amazon
Arctic MX-4 has been the go-to thermal paste for PC builders for over a decade for a reason: it’s incredibly reliable. If you are opening your Steam Deck to replace the SSD and want to refresh the paste while you’re there, MX-4 is a solid, low-cost choice. It’s slightly thinner than MX-6, which makes it very easy to spread, but it can be more prone to the pump-out effect over long periods of high-heat cycles. That said, it still outperforms the stock paste used by Valve. You won’t see world-record-breaking temperature drops, but you will get consistent performance. I’ve used this on countless budget builds, and its 8-year durability rating means you won’t have to open the Deck again anytime soon. It’s the “Old Reliable” of the tech world—unexciting, perhaps, but it gets the job done for the price of a cup of coffee.
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Thermal Grizzly Kryonaut Extreme View on Amazon
For those who want the absolute maximum thermal conductivity without using dangerous liquid metal, Thermal Grizzly Kryonaut Extreme is the peak. This distinct pink paste is engineered for sub-zero cooling and high-performance gaming. With a conductivity of 14.2 W/mK, it transfers heat significantly faster than almost any other non-conductive paste on the market. In my testing, it rivals the PTM7950 for pure thermal dissipation, though it lacks the phase-change longevity. You’ll notice your Deck’s fan ramps up slower because the heat is moving into the sink so efficiently. However, it’s quite expensive for a small syringe and is overkill for most users. It’s also quite thick, so I recommend warming the syringe in a bowl of warm water before trying to apply it. If you’re chasing every single frame and want your APU as cool as possible, this is your weapon of choice.
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Gelid Solutions GC-Extreme View on Amazon
Gelid GC-Extreme has long been a favorite in the laptop modding community because it is incredibly thick and durable. For the Steam Deck, this “thickness” is a virtue. Handheld heatsinks often don’t have the same high mounting pressure as a desktop CPU cooler, which can lead to air pockets or poor contact. GC-Extreme is fantastic at filling those microscopic gaps and staying put. It has a reputation for resisting the pump-out effect almost as well as a phase-change pad. While it can be a little messy to apply because of its putty-like consistency (it comes with a handy spreader), the results are worth it. I’ve found it keeps temperatures stable over months of heavy use where thinner pastes might start to degrade. It’s a specialized tool for a specialized job, and it handles the Deck’s heat cycles like a pro.
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Buying Guide: How to Choose Thermal Paste for Steam Deck
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| Honeywell PTM7950 | Direct-Die Cooling | ★★★★★ | Check |
| Arctic MX-6 | Balanced Performance | ★★★★☆ | Check |
| Arctic MX-4 | Budget Refresh | ★★★★☆ | Check |
| Kryonaut Extreme | Maximum Cooling | ★★★★★ | Check |
| Gelid GC-Extreme | Long-term Stability | ★★★★☆ | Check |
Frequently Asked Questions
Will changing my thermal paste void the Steam Deck warranty?
In most regions, including the US and EU, simply opening your Steam Deck and replacing the thermal paste does not void your warranty thanks to “Right to Repair” laws and specific Valve policies. However, if you break a connector, strip a screw, or short out the motherboard during the process, that physical damage will not be covered. Work slowly, use the right tools, and always disconnect the battery first.
How much of a temperature drop should I expect?
Depending on the quality of your original factory application, you can expect a drop of anywhere from 4°C to 10°C under load. While this might not seem massive, it often means the difference between the fan running at 5000 RPM versus 3500 RPM. This makes the handheld much quieter and prevents the APU from downclocking (throttling) during intense gaming sessions in warm environments.
Can I use Liquid Metal on my Steam Deck?
Technically yes, but I strongly advise against it for 99% of users. Liquid metal is electrically conductive and can easily leak onto the motherboard, destroying the device. Because the Steam Deck is a handheld that gets moved, bumped, and tilted, the risk of liquid metal “escaping” its barrier is much higher than in a stationary desktop. The marginal gains aren’t worth the risk of a bricked console.
What is the “pump-out” effect?
Pump-out occurs when the heat from the APU causes the heatsink to expand slightly, and then contract as it cools. This microscopic “breathing” motion acts like a pump, slowly pushing thin thermal paste out from the center of the chip to the edges. Over time, this leaves the hottest part of the chip with very little paste, causing temperatures to spike. High-viscosity pastes and phase-change pads are designed to resist this.
How often should I replace the thermal paste?
If you use a high-quality paste like Arctic MX-6 or Gelid GC-Extreme, you should be good for 2 to 3 years of heavy use. If you use Honeywell PTM7950, it is designed to last the entire lifespan of the device without needing replacement. You should only consider re-pasting if you notice your fans are running significantly louder than they used to or if you’re seeing unexpected performance drops.
Final Verdict
If you want the absolute best thermal performance and never want to open your Steam Deck again, the Honeywell PTM7950 is the clear winner—it’s a professional-grade solution that solves the pump-out issue entirely. For casual users who just want a cooler, quieter Deck without the fuss of phase-change pads, Arctic MX-6 is a fantastic, high-viscosity alternative. If you’re on a strict budget, MX-4 will still outperform the factory goop with ease.