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.

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. Choosing the wrong one, or leaving a dried-out TIM in place, is one of the leading causes of laptop overheating.

Thermal Paste: The Trusted Workhorse

What it is: A compound made from silicone oil blended with thermally conductive fillers. 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. Best for: Desktop CPUs/GPUs, laptops during routine servicing, DIY builds.

Pros	Cons
Widely available and affordable	Degrades over time — dries out and cracks
Easy to apply; safe around components	Lower conductivity ceiling vs liquid metal
Electrically non-conductive	Needs reapplication every 2–5 years

Verdict: Thermal paste is the go-to for most repairs. When your laptop starts running hot after a few years, a repaste is usually the first and most cost-effective fix.

Liquid Metal: Maximum Performance, Maximum Risk

What it is: A gallium-based alloy that remains liquid at room temperature. Most well-known brand: Thermal Grizzly Conductonaut.

Thermal conductivity: 70–80 W/m·K — roughly 10× higher than premium paste. Best for: High-TDP gaming laptops, enthusiast desktops, experienced technicians only.

Pros	Cons
Drops temps by 10–30°C vs old paste	Electrically conductive — board damage risk
Doesn’t dry out or degrade like paste	Reacts with aluminium heatsinks
Ideal for high-TDP constrained systems	Requires component masking to apply safely

Verdict: Liquid metal is impressive but high-risk. Recommended only for specific high-performance laptops where paste cannot keep temperatures in check — and only applied by experienced technicians.

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

What it is: A Honeywell phase-change material that ships as a solid pad, then transitions to a paste-like state at ~45–52°C — conforming tightly to both surfaces.

Thermal conductivity: ~10–13 W/m·K, but real-world performance often rivals high-end pastes due to superior surface conformance. Best for: Professional laptop repairs, GPUs, long-lifespan applications.

Pros	Cons
Cut to size and place — no spreading needed	More expensive than standard paste
Non-conductive — safe around components	Needs warmup before peak performance
5+ year lifespan — no drying or cracking	Less widely available than paste

Verdict: PTM7950 is arguably the best all-round choice for professional laptop repairs today. Safer than liquid metal, longer-lasting than paste, cleaner to work with.

Side-by-Side Comparison

Feature	Thermal Paste	Liquid Metal	PTM7950 Pad
Thermal Conductivity	4–14 W/m·K	70–80 W/m·K	~10–13 W/m·K
Application Difficulty	Easy	Very Difficult	Very Easy
Electrically Conductive?	No	Yes ⚠️	No
Longevity	2–5 years	5+ years	5+ years
DIY Friendly?	Yes	No	Yes
Cost	Low	Medium	Medium

What Does BreakFixNow Use?

Our technicians assess each device individually before choosing the right TIM. For most laptop repastes, we use Arctic MX-4 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.

If your device is running hotter than it should, a thermal repaste is often one of the best-value repairs you can do. See our laptop overheating repair service for full pricing and options.

Frequently Asked Questions