Thunderbolt or USB4 – the differences explained simply

Thunderbolt and USB4 are powerful interfaces for modern devices – both use the practical USB-C connector and offer ultra-fast data transfer, video and power via a single cable.

Similarities at a glance

  • Up to 40 Gbit/s speed (USB4 Version 2.0: up to 80 Gbit/s)
  • Data, video and power – all via a single USB-C cable
  • Backward compatibility with older USB standards
  • Compatibility with DisplayPort, PCIe & more (depending on device)

Important differences in detail

Thunderbolt 3 & 4

  • Guarantees 2× 4K displays or 1× 8K display simultaneously
  • Daisy chain: Connect up to five additional devices in series
  • At least 32 Gbit/s PCIe throughput (perfect for external SSDs or eGPUs)
  • Up to 100 watts of charging (power delivery)
  • Strict minimum standards: All Thunderbolt 4 devices offer full functionality

USB4

  • Technically based on Thunderbolt 3, but features are flexible depending on the manufacturer
  • Speed: 20 or 40 Gbit/s (USB4 v2: up to 80 Gbit/s)
  • Video and PCIe support possible, but not guaranteed
  • Ideal for everyday use and many modern notebooks
  • Cost-effective and widely available

Technical comparison

Feature Thunderbolt 4 USB4
Connector USB-C USB-C
Max. speed 40 Gbit/s 20/40 Gbit/s (up to 80 Gbit/s with USB4 v2)
Video output 2× 4K or 1× 8K (guaranteed) Device-dependent, dual display possible in some cases
PCIe support Min. 32 Gbit/s guaranteed Optional, depending on device
Daisy chain Up to 5 devices Hubs possible, daisy chain not mandatory
Power supply (PD) Up to 100 W Up to 100 W (depending on device)

Conclusion & practical tip

Thunderbolt 4 is ideal for anyone who needs maximum performance, flexibility and reliability – e.g. for multiple monitors, fast SSDs or demanding accessories.

USB4 is the right choice for everyday applications, home offices and price-conscious users. Pay attention to the information on the range of functions (speed, video, PCIe), as these may vary depending on the manufacturer.

Tip: Thunderbolt 4 cables are universally usable and support both Thunderbolt and USB4 – so you're always on the safe side!
Thunderbolt und USB4 Vergleich Infografik

DINIC USB4 cable – the smart alternative to Thunderbolt

The DINIC USB4 cable delivers up to 40 Gbit/s – ideal for fast data, video signals and power delivery.
It supports many Thunderbolt applications, but is particularly inexpensive and versatile.

Thunderbolt oder USB4 – Die Unterschiede einfach erklärt
  • • Full support for data, video and power delivery
  • • Up to 40 Gbit/s – high speed for modern devices
  • • Backward compatible with older USB standards
  • • Versatile: notebook, dock, monitor and more
  • • Excellent value for money
View DINIC USB4 cables in the shop

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