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For most desktop CPUs, replace the thermal compound every 3–5 years, or sooner if temperatures noticeably increase. You should also always replace it any time you remove or loosen the CPU cooler, because the old paste layer is disturbed and may trap air when remounted.
Key rule:
Thermal compound, also called thermal paste or TIM — thermal interface material — fills microscopic gaps between the CPU heat spreader and the cooler base. Metal-to-metal contact is never perfectly flat, so without paste, small air gaps form. Air has poor thermal conductivity, so the CPU runs hotter.
Over time, thermal compound can degrade due to:
However, good modern thermal paste usually lasts a long time. It is not like engine oil that must be replaced on a strict schedule. Temperature behavior matters more than calendar age.
A good practical approach is:
| Situation | Should you replace paste? |
|---|---|
| PC is 1–2 years old, temperatures normal | No |
| PC is 3–5 years old, never serviced | Optional; check temperatures first |
| CPU temperatures increased by ~5–10 °C under the same conditions | Yes, worth considering |
| CPU is thermal throttling | Yes, after also checking dust, fan speed, cooler mounting, and airflow |
| You removed or loosened the cooler | Yes, always |
| Paste is visibly dry, cracked, or uneven | Yes |
| You are upgrading CPU or cooler | Yes |
A temperature increase alone does not always mean the paste is bad. Before repasting, also check:
Modern CPUs can safely run quite hot. Some CPUs normally boost toward 90–100 °C under heavy load, depending on model and cooling policy. Therefore, do not judge by one absolute temperature alone. Compare against your earlier baseline under similar room temperature and workload.
| Thermal interface type | Typical maintenance interval | Notes |
|---|---|---|
| Standard factory paste | ~2–4 years | Often adequate but not always premium |
| Good aftermarket paste | ~3–5+ years | Noctua, Arctic, Thermal Grizzly, Corsair, etc. |
| High-performance paste in laptops | ~1–3 years in hard use | Laptops suffer more from pump-out |
| Phase-change material, e.g. PTM-style pads | Often 5+ years | Very stable, popular for laptops/GPUs |
| Carbon/graphite thermal pad | Reusable, long-life | Usually slightly worse than good paste but very low maintenance |
| Liquid metal | Inspect more carefully | Excellent performance but electrically conductive and chemically reactive with some metals |
Liquid metal deserves special caution. It should not be used with aluminum heatsinks, because gallium-based liquid metal can attack aluminum. It is also electrically conductive, so spillage can damage a motherboard or CPU package. For most users, a good non-conductive thermal paste is safer and sufficient.
Use:
Procedure:
For most desktop CPUs, a small pea-sized dot in the center works well. For larger CPUs, such as some Intel LGA1700 or AMD AM5 CPUs, a small line, X-pattern, or several small dots can also work. The goal is a thin, continuous layer after pressure is applied.
Avoid:
Too much paste is usually less harmful than too little, assuming it is non-conductive, but an excessively thick layer can slightly increase thermal resistance and make cleanup messy.
If your CPU temperatures are normal, repasting may produce little or no improvement. For example, replacing paste on a well-mounted cooler after two years may only change temperatures by 0–3 °C. Repasting is most useful when:
For a normal home desktop, I would not disturb a good cooler mount just for routine maintenance unless the system is several years old or temperatures have changed.
Replace CPU thermal compound whenever you remove the cooler. Otherwise, for a typical desktop, inspect temperatures and consider repasting after about 3–5 years. Heavy-use, overclocked, laptop, or high-temperature systems may benefit from replacement closer to 2–3 years. If temperatures are stable and the CPU is not throttling, you can safely leave the paste alone.