NVMe SSD Thermal Pad Guide: When You Need One, What Thickness, and How to Install It (PS5, Desktop, Laptop)

Do you actually need a thermal pad? The three-minute test

A pad (or a heatsink that includes one) is worth fitting if your Gen4 NVMe SSD sits above about 70 degrees C under sustained writes, if it lives in a PS5, or if it is in a desktop slot with no cover at all and a hot GPU above it. It is not worth fussing over for a Gen3 drive in an airy laptop that only boots and browses. Most "my SSD is throttling" panic comes from reading one peak number at the wrong time, so start with a measurement, not a purchase.

Here is the test, in order. Stop as soon as one step gives you your answer.

1. Is it a PS5? Then yes, cooling is mandatory. Sony's own support page says to install a heat-dissipation mechanism such as a heatsink and a heat transfer sheet, and not to use an M.2 SSD without one. Skip to the PS5 section.
2. Does the drive already have a heatsink? Many motherboards ship with an M.2 cover that already carries a factory pad, and some SSDs are sold with a heatsink attached. If so, you almost never need a second pad. You need to check that the factory film was peeled (see mistakes).
3. Is it a laptop? You usually have no height for anything. Read the laptop section before buying: a 1 mm error can make the bottom cover bulge.
4. Otherwise, measure. Run the 15 minute sustained write test. If the drive stays under 65 degrees C, a pad is optional. Between 65 and 75, it is a good idea. Above 75, fit one before you do any large transfer.

Temperature thresholds that mean something

There is no single magic number, because each controller and firmware sets its own limits. What the NVMe standard gives you is a framework: every drive reports a composite temperature and publishes a warning threshold and a critical threshold. You can read both yourself (see smartctl). Typical values seen on consumer drives are a warning threshold in the 70s to low 80s and a critical threshold in the mid 80s, but check your own drive instead of trusting a table, including this one.

The controller is hotter than the number you see. The composite temperature is a blend. In one published review of a popular Gen4 drive, the controller itself reached about 82 degrees C while the NAND and composite readings sat in the mid 70s (reported in a review found by search, not a primary vendor document). That gap is why a drive can throttle while the headline number looks only "warm". It is also why contact between the heatsink and the controller chip matters more than anything else on this page.

The same review data point is useful for expectations. A Samsung 990 PRO was reported to reach about 84 degrees C and throttle without a heatsink, and to peak near 68 degrees C with the heatsink version. Treat those as one reviewer's results on one test bench: your case, room and workload will differ, but the order of magnitude (about 15 degrees C improvement from decent cooling) is realistic and matches what technicians commonly see.

What throttling actually feels like

• A large copy starts at 5000 MB/s or more, then falls to 1000 to 2000 MB/s after 30 to 90 seconds.
• A game install or a video export slows down halfway, then speeds up again after a pause.
• Stutters in games that stream assets from the drive, only after long sessions.
• In the worst case, the drive disappears from the system for a moment. That is rare and points toward a different problem (see mistakes and the pro section).

If your speed never falls during a 15 minute test, you do not have a throttling problem, whatever the temperature says. A drive that peaks at 72 degrees C but holds full speed is simply running as designed.

Decision table: pad, heatsink or nothing

Use this table first, then read the sections that match your device.

PS5: the strictest case, with real numbers

The PS5 is the one platform where the rules are written down by the manufacturer, so use them as your checklist. From Sony's PlayStation support page on installing an M.2 SSD (opened 2026-10-04):

• Interface: PCIe Gen4 x4, M.2 NVMe, Key M.
• Capacity: 250 GB to 8 TB.
• Sizes accepted: 2230, 2242, 2260, 2280 and 22110.
• Dimensions including the cooling: up to 25 mm wide, and up to 11.25 mm thick in total, split as 8.0 mm above the board and 2.45 mm below it.
• Speed: 5,500 MB/s sequential read or faster is recommended.
• Cooling: mandatory. The page tells you not to use an M.2 SSD without a heat-dissipation mechanism such as a heatsink or a heat transfer sheet.

Two practical consequences follow. First, the 2.45 mm "below the board" figure is the limit for chips on the back of a double-sided drive. A 2 TB or 4 TB drive with chips on both sides eats most of it, so a heatsink that wraps around the back is a bad idea. Second, the 8.0 mm "above" figure includes the heatsink and the pad together. A tall tower heatsink that looks great on a desktop may simply not fit under the slot cover.

How to choose for a PS5

1. Buy the drive and the heatsink as a matched pair when you can. A drive sold as "PS5 compatible with heatsink" has already been through a fit check. Verify the total height printed on the box against the 8.0 mm top limit.
2. Prefer a low, flat aluminum or copper heatsink with a thin pad already applied to the underside, over a tall finned one. The PS5 has its own airflow path; the bay is cooled by moving air through the console, not by a big heatsink surface.
3. Single-sided drive plus a 1 mm pad is the easy case. Double-sided plus a thick heatsink is where people hit the clearance limit.
4. Do not put a pad on both sides unless the heatsink was designed for it. The slot cover may not close.
5. Do not pick a drive for speed alone. The fastest Gen5 drives produce more heat and can be harder to cool in a PS5 for no gain, since the console only needs Gen4 speeds.

If you only want to know "will it throttle in my PS5?", the console does not show you a temperature. Test the drive in a PC first if you can (see measuring), and judge a drive that survives the PC test with the same heatsink as probably fine in the console. Sony also says that the first time you boot with the new drive you must format it, so back up anything on it first.

Desktop PC: motherboard heatsink or aftermarket?

On a modern desktop board, the first M.2 slot is often covered by a metal plate with a factory pad already stuck on. That is the best starting point: the engineer who designed it knew the exact gap.

The real decision is not "motherboard versus aftermarket". It is "is there a heat path from the controller to a metal surface, and does that surface see air?". A fat heatsink in a stagnant, glass-fronted case, sitting under a GPU exhausting hot air, may do less than a thin plate near an intake fan.

Which slot matters

• The slot closest to the CPU is usually the one with the heatsink and often direct to the CPU, which is the fastest, but it may sit under a large GPU.
• Secondary slots below the GPU are often bare. They are cooler because the GPU is not above them, but they get no airflow in compact cases.
• Chipset-attached slots may run at lower speed. A Gen4 drive there is not stressed as hard, which means less heat.

Check your motherboard manual for which slot has a cover and what thickness of drive it supports.

Laptop: clearance first, cooling second

A laptop SSD bay is a tight sandwich. The drive sits between the motherboard and the bottom cover, often with a thin factory sheet or no sheet. Most laptops give you no room for a heatsink, and some have a copper or graphite sheet that is part of the cooling system.

• Look at what is already there. If the existing drive has a shiny label or a foil sheet on top, keep it on the replacement drive or transfer it. Many laptops expect it.
• Do not stack a heatsink onto the top of the drive without knowing the gap. A thick pad or tall heatsink pushes the bottom cover outward or stops screws from seating.
• Do not use a thick pad to fill "air" above the drive and the cover. Cover flex puts pressure on the drive connector over time.
• Gaming laptops sometimes ship with an M.2 shield plate screwed above the drive. Reuse it and use the original pad thickness.
• Thin ultrabooks are designed so that the SSD runs cool because the controller is efficient. A heavy-duty Gen4 drive may run warmer than the original, so check the specs: drives with large heat output like the newest Gen4 or Gen5 controllers can be a poor fit.

If the laptop was designed for a Gen3 drive and you put in the hottest Gen4 you can find, you can end up with the opposite of an upgrade: a drive that throttles in sixty seconds. Pick a drive known for lower power draw instead, and measure it once installed.

Apple, consoles and sealed devices

Apple Silicon Macs use storage that is soldered or proprietary on most models, and you cannot or should not fit a pad. If a Mac runs hot, the cause is nearly always elsewhere: see our guide on MacBook overheating and how to fix it. For other consoles and handhelds, check the maker's rules first: only the PS5 is covered in this guide.

Pad thickness in millimetres: how to choose without guessing

The right pad is the thinnest one that still touches both the controller and the heatsink with light, even pressure. A pad is a gap filler, not a cooler. Every extra half millimetre adds thermal resistance, so you want just enough squish to close the gap and no more.

Typical thicknesses by situation

These are typical figures from retail kits and board designs, not guarantees. The only reliable number is the one you measure on your own device (see below).

How to measure the gap without a caliper

1. Place the drive in the slot and screw it down with the heatsink off.
2. Lay the heatsink on top of the drive with a thin piece of modeling clay or a folded strip of aluminum foil on the controller. Screw it down gently.
3. Remove it and measure the flattened clay or foil with a ruler or caliper. That is your gap.
4. Choose a pad about 10 to 25 percent thicker than the gap. Soft pads compress; a 1 mm pad squeezed into a 0.8 mm gap is perfect, while a 2 mm pad squeezed into 0.8 mm bends the drive.

If you do not have clay, a printed ruler against the pad edge after a trial fit will do. The point is to measure, not to pick the thickest pad "to be safe". Thick is not safe.

W/mK versus real-world cooling

Thermal pads are sold by thermal conductivity in watts per metre kelvin (W/mK). Retail pads commonly range from about 3 W/mK to 12 W/mK or more. A bigger number is better on paper, but three things reduce the benefit in a real M.2 slot.

1. Thickness matters more than the headline number. A 1 mm pad rated 6 W/mK often beats a 2 mm pad rated 12 W/mK, because heat has less distance to travel.
2. Contact resistance. Marketing figures are measured under lab pressure. A pad barely touching the chip performs far below its rating.
3. The heatsink and airflow limit the result. If the metal surface is small or sits in dead air, the pad rating is irrelevant. You cannot move heat into a surface that is already hot.

So choose a pad in the mid-range of W/mK, make sure it is the right thickness, and spend the rest of the money on a better heatsink or case airflow. Very high-rated pads are often stiffer and need more pressure to conform, which an M.2 screw may not deliver.

Conductive or non-conductive: what is safe on an SSD

Almost every M.2 heatsink pad is electrically insulating silicone-based material, which is what you want. The SSD has exposed gold contacts, tiny surface-mount components and a connector, and a conductive material touching them can short something.

• Safe: standard silicone thermal pads that say "non-conductive" or "electrically insulating".
• Avoid: liquid metal, metallic thermal paste, and carbon or graphite sheets that conduct, anywhere near an SSD board.
• Thermal paste: Even a non-conductive paste is messy and can ooze onto contacts. For SSDs, pads are the cleaner choice because paste and a gap larger than a fraction of a millimetre do not mix.
• Check the label: Some graphite or copper "shim" kits for laptops are conductive. Place them only on the shielded top area they are designed for.

If you are unsure, use the pad that came with a branded SSD heatsink. It was chosen for the part.

Step-by-step install (desktop and PS5 style)

This takes five minutes. Do it with the device powered off and unplugged.

1. Back up first. Working on the SSD itself is low risk, but a slipped screw or static can still harm a drive holding the only copy of your files. If you do not have a backup, read our guide on the difference between data recovery and backup.
2. Power off, unplug, press the power button once to drain residual power, then touch bare metal to discharge static.
3. Open the slot cover or heatsink. Note the screws: M.2 screws are tiny and often different lengths.
4. Clean the surfaces. Wipe the controller and NAND chips on the drive and the metal plate with a lint-free cloth and 90 percent or stronger isopropyl alcohol. Let it evaporate fully.
5. Peel the clear protective film from the pad. Most pads have a thin plastic film on each side (see mistakes). Peel both sides if two films exist. Hold the pad by the edges, not the face.
6. Stick the pad to the heatsink, not to the SSD. It stays flat and is easier to place. Cut it to cover the controller and chips, but not the connector or notch.
7. Insert the SSD into the connector at an angle of about 30 degrees, push gently, then lower and secure with the screw.
8. Fit the heatsink and tighten the screws evenly, only until they stop. The pad should compress evenly, with no gaps at the edges.
9. Close, power on, check that the drive is recognized, then run the temperature test.

Do not reuse an old pad that has been compressed for years: it will not rebound. A fresh pad costs a few dollars.

Mistakes that make things worse (and how to spot them)

When heat is not the real problem

Slow transfers are not always throttling. Check these before blaming the drive:

• Drive nearly full or without free cache: consumer SSDs use part of their free space as a fast write cache, so they slow down at 90 percent full whatever the temperature.
• Slot running at the wrong speed: some slots share lanes with other devices, so the drive may run at Gen3 or at x2 speed. Check the motherboard manual.
• Cheap DRAM-less drives: they slow down during long writes even when cold.
• Background indexing and antivirus: they can saturate the drive. Our guide to fixing a slow computer covers those causes.

How to measure temperature properly (Windows, Linux, Mac)

Take the baseline before you add anything, so you can prove the pad worked. Use the same test afterwards.

CrystalDiskInfo (Windows, simplest)

1. Install CrystalDiskInfo from its official project page.
2. Pick your NVMe drive in the top bar. The temperature shows beside the health status.
3. Note the temperature at idle after 10 minutes of doing nothing.

It shows one composite number and a health summary. It is good for idle readings and a quick check, but it does not log changes over time.

HWiNFO (Windows, detailed logging)

1. Launch HWiNFO and choose "Sensors only".
2. Scroll to your drive's entry. You will see "Drive Temperature", and on some drives "Drive Temperature 2" and a "Drive Warning Composite Temperature" threshold, plus a "Drive Critical Composite Temperature".
3. Expand to see the minimum, current, maximum and average columns, and use the logging option to record to a file during your test.

Compare the maximum against the warning threshold: a drive that peaks 15 degrees C below its warning figure has headroom. A drive that touches it needs help.

smartctl (Linux and macOS, plus Windows with smartmontools)

On Linux, run sudo smartctl -a /dev/nvme0. The output lists the current temperature, "Warning Comp. Temperature Time" and "Critical Comp. Temperature Time", and on many drives the "Warning Comp. Temp. Threshold" and "Critical Comp. Temp. Threshold". For a quick look: sudo smartctl -a /dev/nvme0 | grep -i temp. The "Time" counters tell you how many minutes the drive has spent above those thresholds during its life, which is the best evidence of long-term overheating. A value of 0 is excellent. The nvme smart-log /dev/nvme0 command from nvme-cli gives similar numbers.

Some drives report an unreliable composite value (one smartmontools issue discusses a controller whose standard temperature appears stuck), so confirm with a second tool if the number never moves.

The 15 minute sustained write test

1. Close other programs. Start the temperature log or watch HWiNFO.
2. Copy a large folder, 50 to 100 GB, from one fast drive to the SSD, or run a disk benchmark with a long duration. The goal is a steady write load.
3. Watch the transfer speed and the temperature at 1, 5, 10 and 15 minutes.
4. Record the peak temperature and whether speed fell sharply.

Three realistic scenarios

Realistic scenario (illustrative, not a real customer).

Scenario 1: PS5 with a 2 TB drive that looked fine in a review

A buyer picks a 2 TB double-sided Gen4 drive plus a tall aluminum heatsink listed at 9 mm. The slot cover will not close. The fix is not forcing it: the PS5 limit is 8.0 mm above the board and 2.45 mm below, so the buyer returns the heatsink for a low-profile model near 5 mm, with a 1 mm pad, and the cover closes. Cost: about 20 CAD for the replacement heatsink, minus the return.

Scenario 2: Desktop, 1 TB Gen4 drive under a GPU, 78 degrees C peak

The slot has no cover. The 15 minute test shows 78 degrees C and a speed drop from about 6000 MB/s to about 3000 MB/s at minute eight. The owner adds a flat 12 CAD heatsink with its supplied 1 mm pad. A repeat test shows a peak near 66 degrees C and steady speed. The cost was 12 CAD and ten minutes, and the film was the one step that nearly got skipped.

Scenario 3: Laptop where the pad made it worse

Someone adds a 2 mm pad above a laptop SSD "for safety". The bottom cover bulges slightly and the drive is detected only intermittently because the connector is under stress. Removing the pad fixes it. The laptop never had a heat problem: idle was 41 degrees C and the peak was 68.

Cost: DIY versus paying a technician (CAD)

The remote session cannot place a pad inside your PS5 for you. What it can do is read your sensors, interpret the numbers, decide whether heat is the real cause, and walk you through the install with your camera or screen.

When to call a pro

• The drive disappears from the system, or you get repeated "device not ready" or blue screens, which are more than a temperature issue.
• SMART shows a high "Critical Comp. Temperature Time" or the available spare is low.
• You cannot measure the gap, or the laptop bottom cover will not close.
• The drive holds the only copy of important business or family data and you want a safe plan before changing hardware. See our guide to SSD data recovery difficulty and what recovery costs in Canada.
• You are weighing an SSD upgrade for a slow machine: our SSD versus HDD upgrade guide helps decide.

IT Cares offers remote support, diagnostics guidance and data-safety advice across Canada, and on-site help in Quebec. We do not do board-level repair. For a guided check, call 1 (888) 711-9428 or book through the button below. Our Google rating is 4.9 stars from 78 reviews.

Official resources

• PlayStation Support: install an M.2 SSD in PS5, the source for the size and cooling limits above.
• NVM Express specifications, which define the warning and critical composite temperature fields.
• smartmontools, the project behind smartctl.
• CrystalDiskInfo and HWiNFO, the Windows tools.

Also read the manual of your own motherboard or laptop for supported drive thickness and heatsink fit: that is the most authoritative source for your device.

Frequently asked questions

Related guides

• MacBook overheating: how to fix it
• SSD vs HDD upgrade and repair cost guide
• SSD data recovery difficulty versus HDD
• Computer running slow: fix it
• Data recovery cost in Canada 2026
• Data recovery vs data backup

Sources and official references

Last verified: October 4, 2026

• PlayStation Support: install an M.2 SSD in PS5 (opened 2026-10-04)
• NVM Express specifications (not opened, reference)
• smartmontools project (not opened, reference)