Why it matters for laptop repair
Dried thermal paste is one of the most common and most overlooked causes of laptop overheating. A laptop that ran cool when new but now runs hot and throttles under the same workload almost certainly has degraded thermal paste. Replacing it is a standard maintenance repair that restores factory cooling performance.
In Singapore’s heat and humidity, thermal paste degrades faster than in cooler climates. Laptops used in hot environments or run at high loads frequently should have paste replaced every 2–3 years.
How it works
Even highly polished metal surfaces have microscopic bumps and valleys — when the CPU and heatsink press together directly, air pockets form in these gaps. Air conducts heat very poorly. Thermal paste fills these gaps, creating a continuous thermal path from the CPU surface to the heatsink metal.
Most non-conductive pastes use a silicone base with metal oxide or carbon additives. Liquid metal compounds (such as Thermal Grizzly Conductonaut) use gallium alloys for much higher conductivity but are electrically conductive and require experienced handling.
Shareable fact: Replacing dried thermal paste on a 4-year-old laptop typically reduces CPU temperature under load by 15–25°C — equivalent to the cooling improvement of going from budget to premium cooling hardware.
Common compounds used professionally
At BreakFixNow, Arctic MX-4 is used as the standard compound across all thermal paste services — non-conductive, reliable, and well-suited to Singapore’s climate. Thermal Grizzly Kryonaut is available on request for high-performance builds and overclocking. Liquid metal compounds are reserved for specific desktop CPU applications where maximum thermal performance is required.
Thermal Grizzly
Thermal Grizzly produces several compounds across different use cases — from everyday non-conductive pastes to high-performance liquid metals. Their lineup is differentiated by thermal conductivity, application difficulty, and intended use:
| Product | Type | Conductivity | Best for |
|---|---|---|---|
| Kryonaut | Non-conductive paste | 12.5 W/mK | Desktop CPUs, high-performance builds |
| Kryonaut Extreme | Non-conductive paste | 14.2 W/mK | Extreme overclocking, LN2 cooling |
| Duronaut | Non-conductive paste | ~14 W/mK | Long-term stability, infrequent repasting |
| Conductonaut | Liquid metal | 73 W/mK | Desktop CPU delidding only |
| Conductonaut Extreme | Liquid metal | 100+ W/mK | Maximum performance desktop builds |
Thermal Grizzly Kryonaut
Kryonaut is the compound the HardwareZone community most commonly discusses when comparing premium pastes for desktop CPU repastes. Its low viscosity means it spreads easily and achieves good contact on CPU dies without applying heavy cooler pressure. However, the same low viscosity makes it less suitable for GPU VRAM and VRM applications — it can migrate under sustained heat in Singapore’s climate.
Key characteristics:
- Thermal conductivity: 12.5 W/mK — significantly higher than budget compounds like Arctic MX-4 (8.5 W/mK), though real-world temperature differences are typically 2–5°C
- Electrically conductive: No — safe for use near PCB traces and components
- Curing time: None — performs at rated spec immediately on application
- Lifespan in Singapore: Moderate — Kryonaut’s silicone carrier can dry faster in sustained heat above 80°C. In non-air-conditioned rooms or high-load systems, expect shorter effective life than in cooler climates
- Recommended for: Desktop CPU repastes, overclocking builds, cases where the cooler is regularly removed and reapplied
- Not recommended for: Laptop CPUs (disassembly is complex and Kryonaut’s lifespan is shorter under laptop thermal conditions), GPU VRAM or VRM pads
At BreakFixNow, Thermal Grizzly Kryonaut is available on request for customers who specifically want it for a high-performance or overclocking build. Arctic MX-4 is used as the standard compound across all services.
⚠️ Singapore climate note: Kryonaut is rated to 80°C. In Singapore’s ambient heat, CPUs under sustained load frequently approach or exceed this threshold. For laptops or GPUs that consistently run above 80°C, Arctic MX-6 or Thermal Grizzly Duronaut offer better long-term stability. See our full Thermal Grizzly vs Arctic MX guide for a detailed comparison.
Real example
A customer’s 4-year-old Dell Latitude runs at 95°C under light office work. Disassembly shows the thermal paste has completely dried and cracked, separating from the CPU surface entirely. After cleaning and applying fresh Arctic MX-4, the same workload runs at 68°C — a 27°C reduction. No throttling, fan noise returns to normal.
Common mistakes
- Applying too much thermal paste. A pea-sized dot in the centre is correct — excess paste squeezes out the sides and can contact components it shouldn’t.
- Using electrically conductive compounds on laptops. Liquid metal pastes must not contact the PCB — use them only on bare CPU/GPU dies with experienced technique.
- Not cleaning old paste completely before applying new. Layering new paste over old creates an insulating gap. Clean both surfaces fully with isopropyl alcohol first.
Related terms
- Thermal Throttling — the performance symptom of dried thermal paste
- Heatsink — the component the paste connects the CPU to
- Fan — works with the heatsink to exhaust the heat the paste transfers
Further reading
- Thermal Grizzly vs Arctic MX: Which Thermal Paste Should You Use?
- 10 Most Common Laptop Problems in Singapore
BreakFixNow applies Arctic MX-4 as standard across all thermal paste services for CPUs and GPUs. Thermal Grizzly Kryonaut available on request. Same day, 90-day warranty.
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