USB4 vs Thunderbolt 4 in Tablets: What to Know

What USB4 and Thunderbolt 4 are

USB4 is a specification from the USB Implementers Forum that defines how a single USB-C port can carry data, video, and power simultaneously. It builds on the existing USB ecosystem and supports the USB Power Delivery specification, which has been updated to enable up to 240W over a full-featured USB-C cable and connector, according to the USB-IF.

Thunderbolt 4 is a branded certification that uses the same USB-C connector and is built on the USB4 standard. Tablets that are Thunderbolt 4 certified must meet additional requirements for performance and functionality, but for most users the day-to-day experience is similar. Many Windows tablets and some high-end Android tablets include USB4 or Thunderbolt 4 ports, while Apple tablets use their own implementation of USB-C with some USB4 features.

The USB4 specification has evolved since its introduction, and the USB-IF has announced new versions to increase performance and improve compatibility. The latest USB4 version supports speeds up to 80Gbps, which is double the original 40Gbps capability, according to a USB-IF announcement. This headroom matters if you plan to keep the tablet for several years and want it to handle future peripherals and storage devices without becoming a bottleneck.

Data transfer over the port

Both USB4 and Thunderbolt 4 are designed to handle fast file transfers, external storage, and high-bandwidth peripherals. The USB-IF has announced a new USB4 specification that enables USB 80Gbps performance, which is enough for large video files, backups, and moving projects between a tablet and a desktop. Thunderbolt 4 supports the same high-speed tunneling, though the exact throughput you get depends on the tablet's port implementation and the cable you use.

For everyday tasks like syncing documents or copying photos, even a generation older USB 3.2 port is often sufficient. But if you regularly move large media files or work with external GPUs, a tablet with USB4 or Thunderbolt 4 is worth considering. To avoid compatibility surprises, look for tablets that list "USB4" or "Thunderbolt 4" in the specifications rather than just "USB-C".

When comparing data transfer, remember that the cable matters as much as the port. A full-featured USB-C cable rated for 40Gbps or 80Gbps must be used to achieve the maximum speed. Many chargers only include basic USB 2.0 cables, so you may need to buy a separate cable for high-speed transfers. Look for cables that are certified by the USB-IF or by the Thunderbolt certification program to ensure reliable performance.

If you want to know more about how data moves over USB, see our guide on tablet USB data transfer.

Video output and external displays

One of the biggest benefits of USB4 and Thunderbolt 4 is the ability to drive external monitors over a single USB-C cable. Both standards support video tunneling, which means you can connect your tablet to a 4K display or even a docking station without needing a separate video cable. The USB Power Delivery spec also allows a monitor to charge the tablet while carrying a video signal, reducing cable clutter.

The exact number of displays you can connect depends on the tablet's hardware and the capabilities of the dock or monitor. Tablets with Thunderbolt 4 often have more consistent support for multi-display setups, but many USB4 tablets can handle at least one external display. If you plan to use your tablet as a desktop replacement, check the external display support before buying.

Another factor to consider is the maximum resolution and refresh rate. While most USB4 ports can drive 4K at 60Hz, some may support 1440p at 120Hz or even 8K on newer implementations. The tablet's GPU and the monitor's input determine what is actually possible. Review the tablet's spec sheet for DisplayPort Alt Mode or DP over USB4 support, and look for any mention of HDR or variable refresh rate if you intend to connect a high-end monitor.

For deeper guidance on connecting a tablet to a monitor, read our article on external display support and docking stations.

Docking and power delivery

Docking stations are where USB4 and Thunderbolt 4 shine. With a compatible dock, you can connect a keyboard, mouse, wired Ethernet, and multiple monitors while charging the tablet at the same time. USB Power Delivery is flexible: it allows a device to request only the power it needs and can supply up to 240W through a full-featured USB-C cable, according to the USB-IF. This makes it possible to power a large dock and a tablet from a single charger.

The difference between USB4 and Thunderbolt 4 at a dock is mostly about guaranteed compatibility. Thunderbolt 4 certification ensures that a dock will meet specific power and data requirements, while USB4 devices may vary. For most users, a well-reviewed USB4 dock will work fine. If you already own Thunderbolt peripherals, make sure your tablet's port is backwards compatible; many USB4 ports support Thunderbolt devices, but not always.

Power delivery is a key specification to check when selecting a dock. Some docks only provide 60W of charging, which may be enough for a tablet but not for a larger 2-in-1. The USB Power Delivery specification also supports different voltage levels, including 28V, 36V, and 48V, which enable higher power levels, as described on the USB-IF website. A dock that supports a higher power profile can keep your tablet at full charge even under heavy load.

To see which tablets work best with keyboards and productivity add-ons, browse our collections of keyboard tablets and Windows tablets.

Which one to pick for your tablet

When choosing between tablets with USB4 and those with Thunderbolt 4, consider what you'll connect most often. If you only need to charge, transfer a few files, and occasionally plug in a monitor, USB4 is plenty. If you rely on a specific Thunderbolt dock or external GPU, prioritize a tablet with Thunderbolt 4 certification.

There is no universal "better" option; the right choice depends on your setup. Tablets are becoming more capable as desktop replacements, and both USB4 and Thunderbolt 4 make it possible to connect a wide range of peripherals. Check the port's speed, video output support, and power delivery rating in the tablet's spec sheet before you buy.

Future-proofing is another consideration. If you tend to keep a tablet for three or four years, choosing a model with the latest USB4 version (with 80Gbps support) might give you more headroom for next-generation docking stations and external storage. On the other hand, if you are a professional who needs a reliable dock for day-to-day work, the certification guarantees of Thunderbolt 4 can be more reassuring than theoretical maximums.

For a broad view of current tablets, see our guides to 12-inch or larger tablets and tablets with a stylus.

What to pick for your use

Questions

Is Thunderbolt 4 better than USB4 on a tablet?

Thunderbolt 4 is a certified implementation of USB4 with stricter requirements, but for most tasks they perform similarly. The right choice depends on the peripherals you already own.

Can a USB4 tablet connect to a Thunderbolt 4 dock?

Many USB4 ports support Thunderbolt devices, but not all. Check the tablet's specification for Thunderbolt compatibility before using a Thunderbolt dock.

Do I need USB4 to charge my tablet fast?

Fast charging is determined by the USB Power Delivery spec, not USB4 itself. Many tablets with older USB-C ports support 20V charging; USB4 adds higher power ceilings up to 240W.

Can I output video through any USB-C port on a tablet?

No. The port must support DisplayPort Alt Mode or USB4's video tunneling. Look for "USB4" or "Thunderbolt" in the spec sheet, or verify the manufacturer's video output support.