How often should I replace thermal paste?

Standard paste every two to five years depending on quality and how hard the system runs. Phase change pads last five years or more, graphite pads effectively never need replacing, and liquid metal typically one to three years.

How do I know if my thermal paste has dried out?

Idle and load temperatures creeping up over months with no change to your room temperature or fan curves, fans ramping earlier than they used to, and boost clocks not holding under sustained load.

What is pump-out and why does it matter?

Heat cycling expands and contracts the metal on both sides of the joint, gradually squeezing paste outward from the centre where it is needed most. It is why a good paste can degrade in eighteen months on a hot chip and last five years on a cool one.

Should I repaste a system that is running fine?

No. You gain nothing measurable and you risk disturbing thermal pads, reseating the cooler badly, or voiding a warranty. Repaste when temperatures tell you to.

Does thermal paste expire in the tube?

Yes. Unopened tubes generally keep for three to five years, less once opened. If it has separated or gone stiff and crumbly, do not use it.

Is repasting a laptop different from a desktop?

Yes, and it is harder. Laptops run hottest and have the least thermal margin, but they also often ship with phase change material from the factory precisely because it survives longer, and opening one usually voids the warranty.

Do I need to replace thermal pads at the same time?

On a graphics card, usually yes, and the thicknesses are model specific. Using the wrong thickness makes thermals worse than the degraded paste did, so look up your exact card before starting.

How Often to Replace Thermal Paste (It Depends on What You Used)

Standard paste lasts two to five years, phase change pads last far longer, and graphite pads effectively never dry out. How to tell when yours is done.

There is no single answer to how often you should replace thermal paste, because the honest answer depends entirely on which compound is under your cooler. A graphite pad and a cheap silicone paste are both "thermal interface material" and they fail on completely different timescales.

The more useful question is not how long has it been, but is it still working. Temperature tells you that, and a calendar does not.

Rough Lifespans by Type

Type	Typical replacement interval	Why
Budget silicone paste	1 to 2 years	Dries out fastest, thins under heat cycling
Quality ceramic or metal-oxide paste	3 to 5 years	Better binders, resists drying
High-performance paste (Kryonaut class)	2 to 3 years under heavy load	Excellent conductivity, but prone to pump-out at high temperatures
Phase change pad (PTM7950 class)	5 years or more	Reflows at operating temperature instead of degrading
Graphite pad (Kryosheet class)	Effectively permanent	Solid material, nothing to dry out or pump out
Liquid metal	1 to 3 years	Can be absorbed into the surfaces over time

Treat those as starting points, not rules. A desktop idling in a cool room will outlast all of them. A gaming laptop running near its thermal limit for four hours a day will not.

What Actually Kills Thermal Paste

Two failure modes, and they are not the same thing.

Drying out is what most people picture. The liquid carrier evaporates, leaving a chalky residue that no longer fills the microscopic gaps between the die and the cooler. Cheap pastes do this fastest.

Pump-out is the more interesting one. Every heat cycle expands and contracts the metal on both sides of the joint, and that slow breathing squeezes paste outward from the centre, the exact spot that needs it most. Pump-out is why a high-performance paste can measurably degrade in eighteen months on a hot chip while the same paste lasts five years on a cool one. It is also why phase change pads exist: they reflow each time they reach operating temperature instead of migrating away.

The Signals That Actually Matter

Stop counting years and watch for these.

Idle temperatures creeping up over months, compared against a figure you noted when the system was new
Load temperatures rising while your ambient room temperature and fan curves have not changed
Fans ramping earlier and louder for the same workload
Boost clocks not holding as long as they used to under sustained load
A sudden jump rather than a slow climb, which usually means pump-out rather than drying

A five to ten degree rise over a year, with no other explanation, is the point at which repasting is worth doing.

When Not to Repaste

Repasting a system that is running fine gains you nothing and risks a lot. You are removing a cooler, disturbing thermal pads you may not have replacements for, and reseating a heatsink you might not get flat again.

Do not repaste because a forum thread said two years. Do not repaste a new machine to "get better paste in it" unless you have a measured problem. And on a laptop or a graphics card, weigh the warranty, because opening either usually voids it.

Different Rules for Different Hardware

Desktop CPUs are the easy case. The cooler comes off in a minute, there is one contact point, and a mistake is cheap to fix. Repaste whenever the signals say so.

Graphics cards are harder. There are thermal pads on VRAM and VRM alongside the paste on the die, the pad thicknesses are specific to the model, and getting them wrong makes thermals worse than the degraded paste did. Do not repaste a GPU without knowing its pad thicknesses.

Laptops are the hardest and the most likely to need it, because they run the hottest and have the least margin. They also frequently use phase change material from the factory precisely because it survives longer in that environment.

Consoles sit somewhere in the middle and are covered separately in our PS5 and Xbox guides.

Winner

For most people the right answer is: use a phase change pad like PTM7950 once, and stop thinking about it. It performs within a degree or two of the best pastes, it does not pump out, and it removes the maintenance question entirely for the realistic lifespan of the hardware.

Standard paste is still the right pick if you reseat coolers often, since a pad is a one-shot application and paste is not.

Pros and Cons of Repasting on a Schedule

Pros: Catches degradation before it costs you performance, keeps fan noise down, and on hardware you intend to keep for years it is a few pounds against a measurable temperature difference.

Cons: Every removal risks damaging thermal pads or cracking a die on older bare-die chips, voids warranties on most laptops and graphics cards, and on a system that is not actually degraded you have taken the risk for no gain.

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