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Dell XPS 16 9640 troubleshooting

Dell XPS 16 9640 (XPS 16 9640): what the XPS 16 9640 is; dual graphics; thermals; ports; charging and power; display, and a fix for each symptom below.

What the XPS 16 9640 is
The Dell XPS 16 9640 is a premium 16-inch creator laptop with Intel Core Ultra 7 or Ultra 9 processors, optional NVIDIA GeForce RTX 4050, 4060 or 4070 graphics, up to 64 gigabytes of soldered LPDDR5X memory and a 16.3-inch FHD+ 120 hertz or 4K+ OLED display. It weighs about 2.13 kilograms.

Won't startBattery drainNot chargingWi-FiBluetoothSlow

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1 exact answers

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Dell · USB not recognized

Dell XPS 16 9640 USB or Thunderbolt device is not recognized

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Which units this covers, and how to tell yours is one of them

Model numbers and patterns: XPS 16 9640

Published specification

What is true of this model and changes how you fix it

Official specifications
Intel Core Ultra 7 155H/165H or Ultra 9 185H. Discrete GPU options up to NVIDIA GeForce RTX 4070 (also 4050/4060). Up to 64GB LPDDR5X (soldered). 16.3in display, FHD+ 120Hz or 4K+ (3840x2400) 90Hz OLED. Weight 2.13kg / 4.7lbs.
Tier — premium 16-inch creator (Windows 11)
A large premium 16-inch Windows 11 laptop with a strong discrete NVIDIA GPU and an OLED option — a creator/light-gaming machine. Minimalist keyboard/touch row design.
Dual graphics + thermals
Integrated + discrete GPU with Windows switching; force demanding apps to the NVIDIA GPU if they run slowly. As a powerful thin machine it runs its fans hard under load, which is normal.
Ports — USB-C/Thunderbolt
USB-C/Thunderbolt (plus microSD); use a dock/adapter for legacy ports.
Dual graphics
Windows switches between the integrated and the discrete graphics. A demanding app that runs slowly may be on the integrated chip, so force it to the NVIDIA GPU in Windows Graphics settings.
Thermals
As a powerful machine in a thin body it runs its fans hard under load. That is normal. Keep it on a hard surface with clear vents.
Ports
USB-C and Thunderbolt ports and a microSD slot, with no USB-A. Use a dock or an adapter for older devices.
Charging and power
A high-wattage USB-C charger is needed for full performance. A low-power charger charges slowly and may limit the graphics.
Display
The OLED display shows deep blacks, and a static element can leave a faint image for a while, which usually clears.
Finding the service tag
The service tag is on the underside and in the BIOS.

Where these figures were read. dell.com/support/manuals/en-us/xps-16-9640-laptop/xps-16-9640-owners-manual/dimensions-and-weight (XPS 16 9640 Owner's Manual)

Manufacturer support for this product line. Dell Support — Product support. Official Dell service-tag lookup, drivers, diagnostics and manuals.

Also read for this model. Dell Support — Dell support.

Exact questions

Questions that only have an answer for the Dell XPS 16 9640

My Dell XPS 16 fans are loud and it gets hot under load.+

The XPS 16 packs a powerful discrete GPU and CPU into a thin chassis, so under heavy load (rendering, gaming) it runs the fans hard and warms up to sustain performance — expected, not a fault. Keep it on a hard surface with clear vents, use a Dell 'performance' thermal profile in Dell's power software, and plug in the charger for full speed. If it is hot/loud at idle, check Task Manager for a runaway process.

My Dell XPS 16 fans are loud and it gets hot under load. Is it faulty?+

No, a powerful chip in a thin body runs its fans hard.

Does it have USB-A?+

No, use an adapter.

Why do my games run slowly?+

They may be on the integrated graphics.

Where is the service tag?+

On the underside.