hardware:application_techniques_thermal_compound
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| + | ====== Introduction to Thermal Interface Materials and Best Practices ====== | ||
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| + | Thermal Interface Materials (TIM) is used in the installation of any computer cooling solution to transfer heat from a processor to a heat sink in order to dissipate heat away from the device. | ||
| + | TIM itself does not dissipate heat, it fills microscopic imperfections which result in air gaps on connecting surfaces, allowing for a much more efficient transfer of heat. | ||
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| + | ===== Thermal Paste, Usage and Tipps ===== | ||
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| + | Thermal paste is one of the most popular means to improve heat transfer. | ||
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| + | ==== Applying Thermal Paste Correctly ==== | ||
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| + | Applying thermal paste correctly minimizes air gaps between the CPU and heatsink for optimal cooling, but the amount and method matter to avoid insulation-like effects from excess paste. | ||
| + | Testing various techniques reveals clear winners for coverage, minimal bubbles, and real-world temperatures. | ||
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| + | ==== Key Findings ==== | ||
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| + | We have tested various methods over the years. | ||
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| + | ==== Recommended Method ==== | ||
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| + | 1. Make sure that the CPU is clean and free from any old thermal paste. If there is, carefully remove it from the CPU lid with isopropyl alcohol and a microfibre cloth or lint-free paper towel, then leave it to dry before continuing. | ||
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| + | 2. **Use a simple X-shape**: Draw two thin lines that cross at the centre, adjusting the thickness slightly for larger CPUs to ensure full coverage. | ||
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| + | ==== Reusing Thermal Paste ==== | ||
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| + | Reusing paste can also cause air bubbles to form. If a problem occurs during the installation process and you have to remove the CPU cooler, you should completely clean off all paste as mentioned above, then try again with a fresh application. | ||
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| + | ==== How Often Should You Replace Thermal Paste? ==== | ||
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| + | In most cases, you shouldn’t need to reapply thermal paste more than once every few years, though you should replace it if you remove your cooler for any reason. | ||
| + | You may also want to reapply thermal paste if you find that your CPU temperatures are rising and you can rule out other factors, such as dust build-up. | ||
| + | If in doubt, consult the thermal paste manufacturer, | ||
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| + | ===== Thermal Pads ===== | ||
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| + | Thermal pads are soft, pre-cut sheets made from silicone or reinforced materials with conductive fillers like ceramic or fiberglass. | ||
| + | They handle gaps up to several millimeters, | ||
| + | Performance is moderate (typically 1-8 W/mK), but they excel in convenience over paste. | ||
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| + | ===== Phase Change Materials (PCM) ===== | ||
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| + | PCMs, often in pad or sheet form like Thermal Grizzly PhaseSheet PTM, start solid at room temperature but soften above ~45°C to fill microscopic gaps like paste. | ||
| + | They offer near-paste performance without pump-out or drying, making them suitable for CPUs/GPUs in laptops or desktops. | ||
| + | Electrically non-conductive and durable, though initial heat cycles optimize bonding. | ||
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| + | ===== Thermal Putty ===== | ||
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| + | Thermal putty is a moldable, viscous compound (e.g., Honeywell HT10000, Fehonda TP81) that conforms to uneven surfaces without hardening or drying out. | ||
| + | It fills variable gaps effectively for GPUs or complex assemblies, providing reliable long-term conductivity better than pads in high-tolerance scenarios. | ||
| + | Non-conductive and cost-effective in bulk, though pricier per gram for premiums. | ||
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| + | ===== Liquid Metal ===== | ||
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| + | Liquid metal alloys (e.g., gallium-based) deliver top-tier conductivity (70+ W/mK), outperforming most TIMs for extreme overclocking on CPUs/ | ||
| + | Electrically conductive, it risks shorts if misapplied, so it's for experts only on non-aluminum surfaces (most CPU heatspreaders are made of nickel-plated copper, but avoid direct aluminum contact due to alloying). | ||
| + | No drying issues, but requires careful damming and isn't reusable easily. | ||
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| + | ===== Graphite/ | ||
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| + | Ultra-thin graphite or graphene foils (e.g., Thermal Grizzly Kryosheet) spread heat laterally with high in-plane conductivity, | ||
| + | They suit flat interfaces like CPUs, offering paste-like results in tests without liquids. | ||
| + | Electrically conductive, so avoid bridging contacts; no outgassing issues. | ||
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| + | ===== Other Options ===== | ||
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| + | Gap fillers handle large uneven gaps (up to 15mm) across components with high compressibility. | ||
| + | Thermal foils provide durable insulation and conduction for mid-range needs. | ||
| + | Metal-based TIMs like soft alloys (SMA-TIMs) offer high performance with easier handling than liquid metal. | ||
