CPU & GPU Thermal Paste
Degradation & Lifespan Calculator
Estimate how quickly your thermal paste pumps out or dries out based on daily gaming hours, hotspot temperatures, and paste viscosity.
โ๏ธ Thermal Interface Parameters
๐ ๏ธ Technician Maintenance Verdict
Honeywell PTM7950 is the optimal thermal interface for direct-die GPUs and gaming laptops. Its phase change state prevents pump-out completely, meaning your hotspot delta will remain virtually unchanged for years.
Thermal Interface Comparison Matrix
| Compound | Thermal Conductivity | Viscosity & Pump-out | Average Lifespan | Best Hardware Match |
|---|---|---|---|---|
| Honeywell PTM7950 | 8.5 W/mK | Zero Pump-Out (Phase Change) | 5+ Years | Direct-Die GPUs (RTX 30/40), Gaming Laptops, Steam Deck |
| Arctic MX-4 / Noctua NT-H1 | 8.5 W/mK | Moderate Viscosity | 2 โ 3 Years | Desktop CPUs with Heatspreader (IHS) |
| Thermal Grizzly Kryonaut | 12.5 W/mK | High Pump-Out above 80ยฐC | 6 โ 9 Months | Short-term Benchmarking & Watercooled Low-Temp Loops |
| Liquid Metal (Conductonaut) | 73.0 W/mK | Gallium/Indium Alloy (Corrosive to Al) | 12 โ 18 Months (Alloy Absorbs) | Delidded CPUs & Nickel-Plated Copper Blocks |
Frequently Asked Questions
What is the 'Pump-Out Effect' on GPUs and laptops?
Under gaming load, silicon dies and copper heatsinks expand at different rates due to thermal expansion. When the GPU cools down, they contract. This continuous mechanical flexing acts like a microscopic hydraulic pump, squeezing traditional low-viscosity thermal paste out from the center of the die toward the edges. This leaves bare silicon spots, causing GPU hotspot temperatures to spike to 100ยฐC+ within 2โ6 months.
Why is Honeywell PTM7950 immune to pump-out?
PTM7950 is a phase-change material. Below 45ยฐC, it is a solid polymer pad that cannot migrate or pump out. Above 45ยฐC, it melts into a viscous paste that fills microscopic surface voids. Because it solidifies every time your PC shuts down, it never suffers pump-out or drying out, often lasting 5+ years without maintenance.
Does Thermal Grizzly Kryonaut dry out fast above 80ยฐC?
Yes. Kryonaut was designed for extreme sub-zero overclocking with liquid nitrogen. In continuous ambient gaming environments where GPU hotspot or CPU temperatures exceed 80ยฐC, the silicone carrier oil in Kryonaut evaporates and hardens rapidly, necessitating repasting every 6โ9 months.