Use thermal paste (or the laptop’s specified grease or phase-change material) where the CPU or GPU die contacts the heatsink directly. Use thermal putty or the specified thermal pad where VRAM, VRM components, or other chips sit below a deliberate gap. The correct choice follows the laptop’s original interface and service instructions, not a universal conductivity ranking. Replacing a paste interface with putty, or filling a designed gap with ordinary paste, can reduce contact quality and cooling performance.
Before buying material, identify every contact point under the heatsink. One laptop can use paste on the processor dies and a different gap filler on memory and power components. The sections below show how to identify those interfaces, replace them without changing the designed geometry, and diagnose problems after reassembly.
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Quick decision: paste, putty, or a pad?
| Repair location or condition | Likely material category | What you must verify |
|---|---|---|
| CPU or GPU die touching a flat heatsink surface | Thermal paste/grease, or the OEM-specified phase-change material | The laptop service procedure and the cooler’s contact design |
| VRAM or VRM chip with visible clearance to the heatsink | OEM-specified thermal pad or conformable thermal putty | Original interface type, gap geometry, and replacement instructions |
| Several components at different heights | Usually a combination of paste and gap filler | Each component’s original material and thickness; never use one generic thickness for all locations |
| Unknown interface after opening the cooler | Do not guess | Obtain the model-specific service manual or a repair reference with photographs and measurements |
AMD’s thermal-interface guidance describes grease, putty, and paste as ways to couple a device to a heatsink, while pads are useful when a gap exists or multiple devices must meet one cooling solution. That is a description of interface behavior, not permission to substitute materials in a particular laptop.
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Paste is for a thin, direct interface
A processor die and a heatsink may look flat, but microscopic surface roughness leaves air pockets between them. Thermal paste fills those small voids so heat can move from the die into the heatsink. It is intended to spread into a very thin layer when the cooler is clamped down. Paste is not designed to hold a large, uneven separation between a chip and the heatsink.
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Common names include thermal grease and thermal compound. Some laptops use a phase-change material supplied as a sheet or pre-applied layer instead of conventional paste. If the service guide specifies a phase-change interface, use that specification rather than replacing it automatically with a different compound.
Putty is a conformable gap filler
Thermal putty is soft enough to conform to a measured gap. It is used where a memory chip, voltage-regulator component, or other device does not sit at the same height as the processor die. The heatsink can then contact several components while the putty accommodates their different elevations.
Putty should not be treated as “thicker paste.” Its job is to preserve a designed separation while providing a thermal path. The amount installed affects the final gap and the pressure applied to nearby components. Excess material can prevent the heatsink from seating on the CPU or GPU die; too little can leave a component without contact.
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A thermal pad is a preformed gap filler. Pads are useful when the required thickness and compression are known and repeatable. Putty is more adaptable when component heights vary or the original design uses a moldable compound. Neither category is automatically superior: the laptop’s original construction determines which one is appropriate.
Why the same laptop heatsink can need several materials
Notebook cooling assemblies often cover the processor package, memory chips, voltage-regulator components, and sometimes other controllers with one metal plate or heatpipe assembly. Those parts are not necessarily coplanar. The CPU and GPU dies may be intended for direct metal contact through a thin paste layer, while surrounding chips need a thicker interface.
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Repair guidance from iFixit treats CPU/GPU die locations differently from VRAM locations: paste is used on the dies, while pads or thick paste such as thermal putty may be used for VRAM. This is useful orientation, not a substitute for the exact laptop’s service manual. Manufacturers can change the layout between revisions of an otherwise similar model.
Do not assume that two laptops with the same processor use the same material map. A manufacturer may change heatsink machining, shield height, memory packages, or regulator placement. Record the model number, machine type, and board revision before ordering supplies.
Identify the original interface before removing anything
1. Find the model-specific service information
Look for the manufacturer’s hardware-maintenance or service document for the exact model and board revision. Note the heatsink removal order, screw sequence, torque instructions if given, and any statement about thermal material replacement. A generic teardown video can show location but may cover a different revision.
Lenovo’s ThinkSystem documentation, for example, distinguishes gap pads from putty pads and instructs technicians to replace putty pads with new ones during component replacement. It also warns against using expired putty pads. That document applies to the specified server platform; it demonstrates why OEM instructions take priority, but it is not a universal rule for every laptop.
2. Photograph the assembly before separation
With the bottom cover removed, photograph the heatsink from several angles before loosening it. Capture the location and shape of every pad or putty patch. If a material adheres to the board rather than the heatsink, photograph that side as well. Mark photographs with component names such as GPU die, memory, and VRM.
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3. Separate the cooler evenly
Loosen numbered screws in the reverse of the tightening order, a little at a time, so the heatsink does not tilt and tear soft material. Do not lever against small capacitors or scrape residue across the board. If the manufacturer specifies a sequence, follow it exactly.
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- A thin, spread-out film centered on a die is normally a paste or phase-change interface.
- A cut rectangle or shaped sheet over memory or regulators is a pad.
- A soft, irregular mass that conforms around several components is putty or a similar gap filler.
- A bare area does not prove that no material was intended; some surfaces contact only after the cooler is clamped.
5. Check the contact imprint
The imprint on the old material can show whether the heatsink touched a component. A completely untouched pad or putty area may indicate a wrong thickness, a missing component interface, or a cooler that was not seated correctly. Treat the imprint as a diagnostic clue, not a precise thickness measurement.
How to replace thermal paste on a CPU or GPU die
- Shut down and isolate power. Turn the laptop off, unplug the charger, and disconnect the internal battery when the service procedure permits. Hold the power button only as directed by the service guide.
- Protect the board. Work on a clean, static-aware surface. Keep screws sorted by location; screws of different lengths can damage the board if exchanged.
- Remove old compound completely from the mating surfaces. Use a lint-free wipe and an electronics-safe cleaner recommended for the task. Do not flood the board, and do not leave fibers on the die or heatsink. Avoid scraping the silicon package with a metal tool.
- Inspect both surfaces. The die should be intact and the heatsink should sit flat. Remove only residue; do not sand or bend the cooler.
- Apply the specified material. Use the product and application method called for by the laptop documentation. If no quantity is stated, apply enough to cover microscopic surface roughness once clamped, not enough to form a thick mound. A large blob can squeeze onto nearby components and can hold the cooler off the die.
- Seat the heatsink vertically. Align posts and locating features before contact. Sliding the cooler sideways can move compound away from the die or contaminate adjacent areas.
- Tighten in the documented order. Turn each screw gradually in a cross pattern when instructed. Even pressure allows the compound to spread uniformly and keeps the die from carrying an uneven load.
- Reconnect everything before testing. Refit the fan connector, battery, shields, and any cables removed for access. A missing fan connection can look like a thermal-interface failure.
Do not automatically spread paste with a card or finger. Some compounds are designed to spread under mounting pressure; others have manufacturer-specific instructions. Follow the compound’s instructions when they conflict with a generic technique.
How to replace thermal putty or a gap pad
Match the original interface first
Record where each piece was installed and whether it was a pad or putty. If the service manual names a formulation, thickness, or replacement part, use it. If it does not, a clear photograph and the old material’s compressed imprint are valuable evidence, but they do not establish a universal replacement size.
Remove old material without disturbing components
Lift putty gently with a plastic tool or a clean swab. Do not pull sideways on memory packages, inductors, or tiny capacitors. Remove loose residue from the heatsink and board while keeping debris out of connectors. A pad that has hardened, torn, or absorbed contamination should not be reused unless the service instructions explicitly allow it.
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Form and place the new putty
- Use clean hands or gloves and keep dust, fibers, and oils out of the material.
- Separate the amount needed for each location rather than spreading one large mass across the whole assembly.
- Cover the component’s intended contact area with a continuous layer. Do not block screw holes, vents, or neighboring connectors.
- Keep the putty high enough to bridge the documented gap but low enough that it cannot lift the heatsink away from the CPU or GPU die.
- Place the heatsink straight down and tighten in the specified sequence.
Putty is conformable, but that does not make quantity unlimited. The mounting pressure and the cooler’s stop points determine how far it compresses. If the material squeezes into a fan, connector, or exposed electrical area, stop and clean the assembly before powering it.
When a pad must be replaced instead
If the original part is a pad with a specified thickness, use a pad of the same specification rather than substituting putty. A pad’s thickness and compression are part of the cooler’s mechanical design. Cutting a pad too small can leave part of a chip uncovered; stacking pads or adding paste to make up an unknown thickness changes the pressure relationship.
Choose by more than thermal-conductivity numbers
Thermal conductivity is only one selection factor. AMD lists electrical conductivity, spreading behavior, stability over time, ease of application, and applied pressure alongside thermal conductivity when discussing thermal-interface materials. A material with a higher headline conductivity can still be unsuitable if it cannot maintain the required gap, spreads unpredictably, or creates an electrical risk in the laptop’s layout.
| Decision factor | Why it matters in a laptop | Question to answer before purchase |
|---|---|---|
| Interface geometry | Paste works across a thin direct interface; putty and pads bridge a designed gap | Is the component meant to touch the heatsink directly or through a gap filler? |
| Electrical behavior | Material squeezed onto exposed contacts can cause faults if electrically conductive | Does the product’s technical documentation state its electrical conductivity and safe use? |
| Spreading and pressure | The cooler’s clamp force determines final thickness and coverage | Will the material spread as intended under this heatsink’s mounting pressure? |
| Stability | Migration, drying, or pump-out can reduce contact after repeated heat cycles | Is long-term behavior documented for the intended temperature and orientation? |
| Application control | Uneven or excessive material can tilt the cooler or foul nearby parts | Can you place the amount and shape the service procedure requires? |
| Replacement requirement | Some OEM procedures require new pads or putty whenever the cooler is removed | Does the service manual prohibit reuse or identify an approved replacement? |
AMD’s concise description is: “Thermal interface material fill gaps and transfer heat between the Versal device die and the heat sink.” The sentence comes from AMD documentation for Versal devices, not laptop repair instructions. It accurately explains the general function of a TIM, but it does not specify a laptop’s material, thickness, or quantity.
Thickness and quantity: why generic charts are risky
There is no single laptop-standard putty thickness. The required gap depends on the heatsink, chip package, surrounding components, and mechanical stops. AMD’s guidance explains that interface material fills gaps and that contact quality depends on material properties and mounting conditions. A thickness copied from an unrelated model can leave the die under-contacted or prevent the cooler from seating.
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Use a model-specific service specification whenever possible. If no value is published, preserve the original material’s footprint and compressed height as closely as practical, inspect the contact imprint after a careful trial fit, and seek a qualified repair reference rather than inventing a measurement. Do not use a universal “one millimeter” or “one-size-fits-all” rule.
Electrical and contamination precautions
- Read the product’s technical documentation for electrical conductivity. “Non-conductive” and “electrically insulating” are not interchangeable marketing assumptions; use the stated property.
- Keep paste and putty off connector contacts, test points, and exposed component leads.
- Do not use household grease, adhesive, oil, or a random silicone filler as a thermal substitute.
- Keep the work area free of metal filings and loose fibers.
- Respect expiration and storage instructions. Lenovo specifically warns against expired putty pads in its ThinkSystem service documentation; the same principle makes checking the chosen product’s date and storage conditions prudent, without turning that server rule into a universal laptop specification.
Tools and preparation
A typical repair needs the exact screwdriver bits required by the laptop, a plastic opening tool, a clean tray for screws, lint-free wipes, an electronics-safe cleaning agent, and the model-specified thermal material. An antistatic setup is sensible for exposed boards. A precision screwdriver set is useful only if its bits match the laptop’s fasteners; no particular kit is required by the evidence here.
Keep the service manual open while working. Note cable routing and connector orientation before disconnection. Never force a heatsink that remains attached by a hidden screw or cable.
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Symptoms after reassembly and what they suggest
| Symptom | Likely causes to check first | Corrective action |
|---|---|---|
| CPU or GPU temperature rises sharply at idle | Fan connector disconnected, cooler not seated, paste missing or contaminated | Power down, verify the fan and mounting screws, then inspect the die imprint and interface |
| Processor throttles while memory or regulators remain unusually hot | Paste interface is poor, or surrounding putty/pads are missing or too thin | Compare every contact location with the pre-repair photographs and service diagram |
| Heatsink rocks or screws do not reach their posts | Too much putty, stacked pads, or material placed over a stop | Remove the cooler and restore the specified height; do not tighten screws by force |
| One memory chip shows no contact imprint | Gap filler is misplaced, undersized, or too thin | Replace that interface using the model-specific specification |
| Residue appears around connectors or components | Excess material or sideways movement during installation | Disconnect power and clean the affected area before further testing |
| Temperatures vary from boot to boot | Uneven screw pressure, cooler movement, fan-control issue, or unstable contact | Recheck the tightening sequence and mechanical seating before changing compounds |
Temperature readings alone do not identify the failed interface. Compare behavior under the same workload and ambient conditions, and first rule out fan operation, blocked vents, firmware fan curves, and background load. Avoid treating a single sensor reading as proof that a particular material is wrong.
Common mistakes to avoid
- Putting paste on every chip: paste is not a substitute for a designed gap filler and may leave memory or regulator components without the required support.
- Replacing all pads with one putty layer: different locations can require different heights and compression.
- Choosing by conductivity alone: geometry, electrical behavior, spreading, stability, pressure, and application control are equally relevant.
- Using an internet thickness table without model evidence: tables often describe another cooler and another component layout.
- Reusing damaged material: torn pads and contaminated or hardened putty no longer represent the original interface.
- Over-tightening to compensate for poor contact: excessive force can warp the board or damage the die; correct the material and seating instead.
- Ignoring revision differences: a later board or heatsink revision may move components or change the interface.
- Relying on a teardown as the service specification: use photographs for orientation, then confirm the manufacturer’s instructions.
A practical decision sequence
- Identify the exact laptop model and board revision.
- Locate the manufacturer’s service instructions and note any required replacement parts.
- Map each heatsink contact to a component: CPU/GPU die, VRAM, VRM, or another device.
- Classify each interface as direct paste/phase-change, pad, or putty from the documentation and physical evidence.
- Confirm electrical properties, material condition, and any expiration or storage requirements.
- Clean and replace one interface type at a time, preserving the original footprint.
- Seat the cooler without sliding, tighten in the specified order, and reconnect the fan and battery.
- Test at the same workload used before repair, then investigate mechanical contact before trying a different material.
When to stop and seek a qualified repairer
Pause the repair if the heatsink will not separate without force, the original material map is unclear, a component has lifted, a screw post is damaged, or the service document gives a thickness or compound that you cannot source confidently. A professional with the correct service data can measure the assembly and verify contact. Continuing with a guessed thickness risks a functioning laptop that overheats, throttles, or suffers board damage.
Quick Recap
Final checklist before powering on
- Every CPU/GPU die has the specified direct-contact material.
- Every VRAM, VRM, and other gap location has the correct pad or putty, in the documented footprint and height.
- No material covers connectors, exposed contacts, fan blades, or screw holes.
- The heatsink sits flat and all screws are present and tightened in sequence.
- The fan cable, battery, shields, and other removed connectors are restored.
- The material is within its stated storage and use limits.
- The first test uses a known workload while you watch temperatures, fan operation, and throttling.
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