I’ve repaired well over 200 Dell XPS 15 units over my 16 years in the business, and if there’s one thing every single owner eventually asks me about, it’s heat. The XPS 15 is a genuinely excellent machine — beautiful display, premium build quality, serious CPU and GPU performance — but Dell’s thermal design has been playing catch-up with its own hardware for years. Whether you’ve got a 9520, 9530, 9560, or 9570, the story is usually the same: the fans scream under load, performance tanks from thermal throttling, and the bottom of the laptop could double as a griddle.
The good news? In almost every case I see at my Cincinnati shop, this is a fixable problem. Dell XPS 15 overheating is rarely a sign of a dead laptop — it’s a sign of a laptop that needs attention. In this guide, I’m going to walk you through every fix I use, starting with the easy software tweaks and working all the way up to hardware-level repairs. By the end, you’ll know exactly what your machine needs and whether it’s something you can handle yourself or whether it’s time to bring it to a pro.
Let’s get into it.
Why the Dell XPS 15 Overheats
Before we start throwing fixes at the problem, it helps to understand why it happens in the first place. The XPS 15’s core issue is a physics problem: Dell shoved a full-power 45W H-series processor and a discrete NVIDIA GPU into a chassis that’s roughly 18mm thick. That’s an enormous amount of heat-generating hardware packed into very little space, with limited airflow paths and a cooling system that has to do the work of a much larger laptop.
The thin chassis forces Dell to use slim, low-profile fans with small fins that can’t move nearly as much air as the cooling system really wants. The two heat pipes that connect the CPU and GPU to the heatsink work hard, but when both chips are running hot simultaneously — which happens anytime you’re gaming, rendering video, or running a demanding workload — the system simply can’t shed heat fast enough. The result is thermal throttling, where the processor cuts its own clock speed to reduce heat generation. You’ll see frame rates drop, video exports slow to a crawl, and the laptop feel sluggish even though your specs look great on paper.
Dell’s factory thermal paste compounds this problem. The paste Dell applies at the factory tends to be a middle-of-the-road compound, and it dries out and degrades faster than premium options. In laptops I open that are 3-4 years old, I regularly find paste that has turned into a flaky, crumbly mess with virtually no thermal conductivity left. That alone can add 15–25°C to your CPU temperatures.
Dust is the other major culprit. The XPS 15 draws air in through the keyboard deck and vents it out through thin slots on the rear hinge. Dust accumulates on the heatsink fins and fan blades over time, gradually choking airflow. On laptops used in carpeted rooms or homes with pets, I’ve seen the heatsink fins completely blocked solid after just 18 months.
Models Most Commonly Affected
I see Dell XPS overheating complaints across the entire modern XPS 15 lineup, but certain models come into the shop more often than others:
- XPS 15 9560 / 9570 — The older generation with Intel 7th and 8th-gen CPUs. Notorious for thermal throttling out of the box, especially under combined CPU/GPU load. These were the models that really put the XPS 15’s thermal problems on the map.
- XPS 15 9520 — Intel 12th-gen platform. The shift to hybrid CPU architecture (P-cores and E-cores) made power management more complex. Many owners report that the factory power limits are set too aggressively for the chassis.
- XPS 15 9530 — Intel 13th-gen. Same fundamental chassis, same fundamental thermal challenge. The more powerful i9 configurations are particularly prone to throttling under sustained load.
If you want to see what temperatures your system is actually hitting right now, download HWiNFO64 (free) and run it while doing something demanding. CPU temperatures above 95°C under load, or GPU temperatures above 85°C, confirm that your thermal management needs work.
Section 1: Software Fixes (Try These First)
I always tell customers: start with software before you open anything up. Some of these tweaks will give you dramatic improvements without touching a screwdriver, and they’re completely free. Even if you do end up doing a full repaste, these software optimizations will stack on top of the hardware fixes and squeeze out every last bit of thermal headroom.
1. Set the Right Windows Power Plan
This sounds basic, but I’m consistently surprised how many laptops come in running on “High Performance” or a custom Dell power plan that prioritizes raw speed over thermals. Go to Control Panel → Power Options and select “Balanced.” On Windows 11, you can find this under Settings → System → Power & Sleep → Additional Power Settings. The Balanced plan allows the processor to ramp down when it doesn’t need full power, which reduces heat during lighter tasks. It won’t cripple your performance for demanding workloads, but it eliminates the unnecessary heat during web browsing and document editing.
Also check Dell’s own Power Manager application (installed by default on most XPS systems). Set Thermal Management to “Cool” rather than “Ultra Performance.” This adjusts fan curves to spin up sooner, keeping temperatures lower before the system hits a thermal ceiling.
2. Undervolt with ThrottleStop
Undervolting is one of the most effective Dell XPS 15 overheating fixes available, and it doesn’t require opening the laptop at all. The idea is simple: your CPU is shipped from the factory with a voltage that provides a safety margin for the worst-case chip. Most CPUs can run stably at a lower voltage, which means less power consumption and significantly less heat.
ThrottleStop is the free utility most repair technicians use for this. Here’s the approach:
- Download ThrottleStop from the developer’s site (TechPowerUp hosts the latest version).
- Open ThrottleStop and click the FIVR button (Fully Integrated Voltage Regulator).
- Under “CPU Core Voltage,” check “Unlock Adjustable Voltage” and start with an offset of -100mV.
- Apply the setting and run a stress test (Prime95 or Cinebench R23) for 15–20 minutes. If the system is stable, try dropping another 10–15mV.
- For XPS 9560/9570 (7th/8th-gen Intel), many users stabilize at around -125mV to -135mV. For 12th/13th-gen models (9520/9530), start conservative at -80mV to -100mV.
Important caveat: newer Dell BIOS versions (especially on the 9520 and 9530) have locked undervolting at the firmware level. If ThrottleStop shows the FIVR controls grayed out, Dell’s BIOS update has blocked you. There are community workarounds involving EFI variable modifications, but those are advanced procedures with real risks — if you’re not comfortable in EFI shells, skip this step and focus on the hardware fixes below.
A successful undervolt on an XPS 15 9560 or 9570 can drop peak CPU temperatures by 10–15°C. That’s significant.
3. Update Your BIOS
Dell releases BIOS updates that sometimes include improved power limit configurations and fan curve adjustments. Check Dell.com → Support → Drivers & Downloads, enter your Service Tag, and look for BIOS updates. Read the release notes — if they mention thermal improvements or power management changes, install the update.
That said, be aware that some BIOS updates (particularly on 9570 and 7590 models) disabled undervolting as a security measure related to the Plundervolt vulnerability. If you’re on an older machine and currently undervolting successfully, think carefully before updating.
4. Disable Turbo Boost (Last Resort)
This is a nuclear option I only recommend when someone absolutely needs silence and cool temperatures and is willing to trade peak performance for it. Intel Turbo Boost allows the CPU to exceed its base clock speed for short bursts, which is great for performance but generates significant heat spikes. You can disable it through ThrottleStop by checking the “BD PROCHOT” box, or through the Windows registry.
On an i7-9750H (XPS 15 9570), disabling Turbo Boost will drop your CPU from a 4.5GHz boost to the 2.6GHz base clock. You’ll lose a lot of single-threaded speed. I’d exhaust every other option first.
Section 2: Clean the Fans and Vents
If the software fixes helped but didn’t fully solve the problem — or if your XPS 15 fan noise has gotten progressively louder over the past year — it’s time to open the laptop and clean the cooling system. This is probably the single most impactful physical maintenance you can do on any laptop, and on the XPS 15, it should happen every 12–18 months if you’re a heavy user.
What You’ll Need
- Torx T5 screwdriver (this is essential — don’t try to substitute a Phillips)
- Phillips #0 screwdriver
- Can of compressed air or an electric air blower
- Soft paintbrush or anti-static brush
- Plastic spudger or guitar pick (for separating the bottom panel)
Step-by-Step: Bottom Panel Removal
Shut down the laptop completely and unplug everything. Flip it upside down on a clean, non-carpeted surface. You’ll see ten Torx T5 screws around the perimeter of the bottom panel, plus two additional Phillips #0 screws near the rear hinge area on the 9520/9530 generation. Remove all of them and set them aside — I like to stick mine to a piece of tape so I don’t lose any.
The bottom panel is held in place by plastic clips in addition to the screws. On first disassembly, this panel feels like it’s welded on. Start at the rear hinge corners, which have the thickest plastic, and work a plastic spudger or guitar pick into the seam. Work your way around the edges with gentle, even pressure. Do not yank or lever aggressively — the XPS bottom panel clips are brittle on older machines and will break if you force them.
Once inside, immediately disconnect the battery connector from the motherboard before touching anything else. The battery connector is a small ribbon cable on the right side of the battery. Just pull it straight out.
Cleaning the Heatsink and Fans
The heatsink fins are usually where the worst dust buildup accumulates. You’ll see a dense mat of compressed lint and dust on the fins — on some machines I’ve worked on, it’s thick enough that the fins look solid. Use your soft paintbrush to gently loosen the debris, then use short bursts of compressed air to blow it out through the vent slots. Never use a continuous blast of compressed air directly into the fan — this can spin the fan blades at speeds they’re not designed for and damage the bearings. Hold the fan blades still with a finger while blowing around them.
For the fan blades themselves, wipe each blade with a slightly damp microfiber cloth or a dry cotton swab. Check that each fan spins freely by hand — it should turn smoothly with minimal resistance. Any grinding, wobbling, or stiffness indicates bearing wear, which we’ll cover in the hardware section.
After cleaning, you should notice an immediate improvement in fan noise volume and frequency. I’ve had customers tell me their laptop sounds like a different machine after a thorough cleaning — and temperatures often drop 8–12°C from cleaning alone.
Section 3: Replace the Thermal Paste
If you’ve cleaned the fans and the laptop is still running hot, or if your machine is 2–3 years old and has never been repasted, this is your next step. Replacing the thermal paste on a Dell XPS 15 is the single most impactful repair I do for overheating customers. I regularly see CPU temperature drops of 15–25°C after a proper repaste with quality compound. This is not a small improvement — it’s the difference between a laptop that throttles constantly and one that runs at full speed.
Why Dell’s Factory Paste Fails
Dell’s OEM thermal compound is functional when it’s fresh, but it tends to dry out and crack faster than enthusiast-grade alternatives. The heat cycling that happens every time the laptop warms up and cools down gradually degrades the paste’s ability to fill microscopic gaps between the CPU/GPU dies and the heatsink contact surfaces. When that happens, air pockets form, and air is a terrible thermal conductor. What was once a good thermal interface becomes an insulator.
Recommended Thermal Pastes
- Thermal Grizzly Kryonaut — My top pick for laptops. Excellent thermal conductivity (12.5 W/mK), non-conductive so there’s no risk if you get it on surrounding components, and it stays pliable longer than most compounds. This is what I use on the majority of XPS 15 repairs at my shop.
- Noctua NT-H1 — A perennial favorite among PC enthusiasts. Slightly lower conductivity than Kryonaut but exceptionally long-lasting (stable for 5+ years) and very easy to work with. Great choice if you want a set-it-and-forget-it paste.
- Arctic MX-6 — Excellent value, non-electrically-conductive, and performs very close to Kryonaut at a lower price point. A solid all-around choice, especially for first-timers.
You can find a full comparison of these and other options in our best thermal paste for laptops guide.
Step-by-Step: Repasting the XPS 15
With the bottom panel already removed and the battery disconnected from the cleaning step, you’re ready to proceed. You’ll also need 99% isopropyl alcohol and lint-free microfiber cloths or coffee filters.
- Remove the heatsink assembly. On most XPS 15 models, the heatsink is secured by four captive screws (they stay attached to the heatsink, which is helpful). Loosen them in the reverse order of the numbers stamped into the heatsink — usually 4, 3, 2, 1. This ensures even pressure release. On the 9520/9530, the heatsink covers both the CPU and GPU and has additional fan screws to remove first.
- Lift the heatsink carefully. Do not pull on the heatpipes to lift it — the heatpipe assembly is easily bent and a bent pipe permanently reduces its effectiveness. Get your fingers under the heatsink plate at the CPU or GPU location and lift straight up. The old paste will create suction that requires steady upward pressure to break.
- Clean the old paste. Apply a small amount of 99% isopropyl alcohol to a microfiber cloth and wipe the old paste from both the CPU die (the small exposed chip on the motherboard) and the corresponding contact surface on the heatsink. Keep wiping with fresh sections of cloth until no grey residue transfers. Do the same for the GPU die and its heatsink contact. The surfaces should look clean and slightly shiny when done.
- Apply new paste. For the XPS 15’s relatively small CPU and GPU dies, use a pea-sized dot (roughly 3–4mm diameter) placed in the center of each die. The pressure from the heatsink will spread it. Don’t pre-spread — just let the heatsink do the work, which gives more consistent coverage.
- Reinstall the heatsink. Lower it straight down onto the dies and hold firm pressure while you start the screws. Tighten them in the numbered sequence (1, 2, 3, 4), doing a little at a time in a cross pattern so the pressure is applied evenly. Do not overtighten — snug is enough.
After reassembling and booting up, run a stress test and check temperatures in HWiNFO64. A successful repaste with quality compound should bring your CPU temperatures down noticeably compared to before.
Section 4: Thermal Pad Replacement
This is the step that most DIY guides skip, and it’s often the step that makes the difference between a good result and a great one. The XPS 15 doesn’t just use thermal paste — it also uses thermal pads on the VRM (Voltage Regulator Module) components, VRAM chips, and other heat-generating components surrounding the CPU and GPU.
These pads are silicone sheets pre-cut to cover specific chips. Over time, they compress and dry out just like thermal paste. When the VRM pads fail, those components can’t shed heat effectively, which triggers a secondary throttling mechanism — the laptop clocks down to protect the VRMs even if your CPU temperatures are acceptable. I’ve repasted laptops that were still throttling, tracked the issue to degraded VRM pads, replaced them, and seen the throttling disappear entirely.
Sizing Guide for Common XPS 15 Models
Getting the right thickness matters here. Too thin and the pad won’t make contact; too thick and you’ll have trouble reassembling or create uneven heatsink pressure. Based on what I consistently measure across XPS 9500-series machines:
- VRAM chips: 0.5mm thermal pads
- VRM MOSFETs (smaller): 0.75mm thermal pads
- VRM MOSFETs (larger/case contact): 1.5mm thermal pads
For the 9560/9570 generation, 1.5mm pads on the MOSFETs are particularly important — this is the “VRM mod” that the XPS enthusiast community has documented as dramatically reducing thermal throttling under heavy load. The key is that you want 6 W/mK conductivity pads for the case-contact application, not ultra-high-conductivity pads. Pads that are too conductive will transfer too much heat into the chassis near the VRMs rather than out the back vents, which paradoxically makes things worse.
When replacing pads, measure the existing ones carefully with a micrometer or compare them against a known thickness. Cut replacement pads to size with sharp scissors or a utility knife. Remove the protective film from both sides before installing.
Section 5: External Cooling Solutions
I want to be straight with you here: a laptop cooling pad is not a substitute for fixing the root cause of overheating. If your heatsink fins are clogged and your thermal paste is dried out, a cooling pad will give you maybe 3–5°C of improvement while the real problems remain. Fix the hardware first. That said, a good cooling pad used in conjunction with the fixes above can provide meaningful additional headroom, especially for sustained workloads like gaming sessions or long video renders.
The XPS 15 exhausts air out the rear hinge vents, but it also draws in some air through the bottom intake slots. A cooling pad that elevates the laptop and blows air toward those intake slots can help slightly. More useful are the “vacuum”-style coolers that attach to the rear vents and actively draw hot air out — those are more effective than simple fan-and-platform pads for the XPS design.
If you do want to add a cooling pad to your setup, the Llano V12 Cooling Pad is a solid option that works well with larger 15-inch laptops. It elevates the chassis for better passive airflow and has adjustable fan speed — useful when you want the extra airflow during intensive tasks but don’t want fan noise during lighter work.
When Cooling Pads Help vs. When They Don’t
- They help when: You’ve already cleaned/repasted and want extra headroom during sustained gaming or rendering. You frequently use the laptop on beds or soft surfaces that block bottom intake vents.
- They don’t help when: The heatsink fins are blocked with dust (fix that first). The thermal paste is completely degraded (fix that first). The fans are failing. These are root causes that no external pad can compensate for.
Section 6: When the Problem Is Hardware
Most Dell XPS 15 overheating cases are resolved by the steps above — software optimization, cleaning, repasting, and pad replacement. But occasionally the issue goes deeper, and it’s important to recognize the signs that you’re dealing with a hardware failure rather than a maintenance problem.
Failing Fan
The XPS 15 has two fans — one for the CPU side and one for the GPU side. When a fan bearing starts to fail, you’ll hear it: a grinding, rattling, or persistent whirring sound that’s different from the normal whoosh of fans at speed. A failing fan may spin at lower-than-normal RPMs, reducing airflow and causing temperatures to climb even after cleaning and repasting.
You can verify fan health in HWiNFO64, which shows RPM readings for each fan. If one fan is reading significantly lower RPMs than the other under the same load, or shows 0 RPM when temperatures are high, that fan likely needs replacement. I also mentioned earlier: when the bottom panel is open, spin each fan by hand. It should rotate smoothly and freely. Any resistance, grinding, or wobble is a red flag.
Replacement fans for the XPS 15 are available through iFixit, Dell’s parts portal, and third-party suppliers on Amazon. On the 9520/9530, the fans are reasonably accessible once the bottom panel is off. The repair is within reach of a careful DIYer — iFixit has a detailed fan replacement guide for the 9530 that I recommend following.
Motherboard Thermal Sensor Issues
In rare cases, a faulty thermal sensor on the motherboard will cause the system to read inaccurate temperatures. You might see the laptop throttling aggressively even though HWiNFO shows cool temperatures, or conversely, you might see extremely high reported temperatures even after a fresh repaste. If after cleaning and repasting your temperatures look completely normal but the laptop is still throttling or shutting down, a sensor issue may be the culprit.
Diagnosing this definitively requires running Dell’s built-in ePSA diagnostics (press F12 at boot and select “Diagnostics”) as well as comparing sensor readings across multiple monitoring tools. If diagnostics flag a sensor fault, this is a motherboard-level repair that typically means a board replacement. That’s a job for a shop — not worth attempting at home unless you have experience with BGA soldering.
When to Seek Professional Repair
Bring your XPS 15 to a professional if:
- The laptop shuts down suddenly under light loads (not just throttles — actually powers off)
- You’ve cleaned and repasted and temperatures are still above 95°C at idle or light use
- One or both fans read 0 RPM in monitoring software despite the laptop being hot
- The system fails Dell’s built-in ePSA diagnostics
- You’re not comfortable opening the laptop — a stripped screw or damaged ribbon cable will turn a $30 repair into a $300 one
Also check out our guide on HP laptop overheating fixes if you have a mixed-fleet situation or are comparing approaches — many of the diagnostic steps translate across brands.
Final Thoughts
Dell XPS 15 thermal throttling is frustrating precisely because it affects one of the best laptop platforms on the market. You paid premium money for a machine that should perform, and watching it limp along at reduced clock speeds because of dried-out thermal paste or a dust-clogged heatsink is genuinely annoying. The upside is that these are all solvable problems.
Here’s the order I’d follow:
- Start with software — Power Plan adjustments and ThrottleStop undervolting (where BIOS permits)
- Check and update your BIOS
- Open the laptop and clean the fans and heatsink fins
- Replace the thermal paste with Kryonaut, NT-H1, or MX-6
- Inspect and replace thermal pads on the VRMs and VRAM
- Add a cooling pad if you want extra headroom
- If problems persist, diagnose for hardware failure and seek professional repair if needed
In my experience, doing steps 1 through 5 on an XPS 15 that’s 2–3 years old will transform its thermal behavior completely. I’ve seen machines that were shutting down under Teams calls run stably through full gaming sessions after a proper cleaning and repaste. It’s one of the most satisfying repairs there is — big result, relatively simple procedure.
If you’ve worked through this guide and still can’t get your temperatures under control, or if you’d rather have a professional handle it, reach out. That’s what we’re here for.
Still struggling with your Dell XPS 15 overheating? Drop your model number and symptoms in the comments below, and I’ll help you diagnose the specific issue. If you’re in the Cincinnati area and want professional service, visit Cincinnati PC Repair LLC — we handle XPS thermal repairs regularly and can usually turn around same-day service.