Thermal Paste vs Liquid Metal vs PTM7950 Pads: Which Is Best for Your Device?

If you’ve ever wondered why your laptop runs hot even after a “cleaning,” the answer often lies in something most people never think about: the thermal interface material (TIM) sitting between your CPU or GPU and its heatsink.

Thermal paste, liquid metal, and PTM7950 phase-change pads are the three main contenders — and they are not interchangeable. Each has its place, its strengths, and its risks. Here’s what you actually need to know.

What Is a Thermal Interface Material (TIM)?

A TIM fills the microscopic air gaps between a processor’s heat spreader (or bare die) and the heatsink. Air is a terrible conductor of heat — so even a razor-thin layer of it can send temperatures soaring. The TIM’s job is to replace that air with something that conducts heat efficiently.

The better the TIM, the more efficiently heat moves from your chip to the heatsink — and ultimately out of your device.

Thermal Paste: The Trusted Workhorse

What it is: A compound made from silicone oil or other carrier fluids blended with thermally conductive fillers like zinc oxide, aluminium oxide, or silver particles. Premium options like Thermal Grizzly Kryonaut and Noctua NT-H2 sit at the top of the performance range.

Thermal conductivity: Typically 4–14 W/m·K depending on formulation.

Best for: Desktop CPUs and GPUs, laptops during routine servicing, DIY builds, and situations where re-application every 2–5 years is acceptable.

Liquid Metal: Maximum Performance, Maximum Risk

What it is: A gallium-based alloy — typically a blend of gallium, indium, and tin — that remains liquid at room temperature. The most well-known brand is Thermal Grizzly Conductonaut.

Thermal conductivity: 70–80 W/m·K — roughly 10× higher than premium thermal paste.

Best for: High-performance gaming laptops, enthusiast desktops, bare-die CPU configurations, and professional technicians with proper tools and experience.

PTM7950 Phase-Change Pads: The Best of Both Worlds?

What it is: PTM7950 is a phase-change thermal interface material developed by Honeywell. It ships as a solid pad at room temperature, then transitions to a viscous, paste-like state once it reaches around 45–52°C during operation — at which point it conforms tightly to the surface.

Thermal conductivity: ~10–13 W/m·K (solid state spec), but real-world performance often rivals or exceeds high-end pastes due to superior surface conformance.

Best for: Laptops where repasting is frequent or difficult, devices with uneven heatsink contact, and technicians who want a clean, reliable, long-lasting result.

Side-by-Side Comparison

What Does BreakFixNow Use?

At BreakFixNow, our technicians assess each device individually before choosing the right thermal interface material. For most laptop repastes, we use high-quality thermal compound or PTM7950 pads depending on the device’s design and thermal requirements. For select high-performance gaming laptops where thermals are severely constrained, we offer liquid metal repaste as a premium service — applied with full component masking and proper technique.

We don’t cut corners on TIM quality, because a poor repaste is often worse than no repaste at all.

So, Which Should You Choose?

• Getting your everyday laptop serviced? Quality thermal paste or PTM7950 will serve you very well.
• Running a high-end gaming laptop that throttles under load? Ask about liquid metal — but only from a technician who knows what they’re doing.
• DIY on your own desktop or laptop? Thermal paste is the safest starting point. PTM7950 pads are worth the upgrade for a cleaner job.

If your device is running hotter than it should, a thermal repaste is often one of the best-value repairs you can do. It can restore years of performance in under an hour.

Frequently Asked Questions