USB4 vs Thunderbolt 4 & 5: What’s the Difference?

 Ever bought a USB-C cable expecting to connect your 8K monitor, only to get a black screen? Or waited 20 minutes to transfer a 100GB video file? The chaos of overlapping USB-C standards is to blame. We’re breaking down the three most popular high-speed USB-C specs in 5 minutes flat, no jargon included.

 

Quick Comparison Table (At a Glance)

Skip the deep dive and use this cheat sheet to pick the right cable:

FeatureUSB4Thunderbolt 4Thunderbolt 5
Release Year2019 (USB4 2.0 / 80Gbps: 2022)20202023
Max Bandwidth20Gbps (base) / 40Gbps (premium) / 80Gbps (USB4 2.0)40Gbps (mandatory minimum)80Gbps (symmetric) / 120Gbps (asymmetric video mode)
Video OutputOptional (DP 1.4a if supported, max 1x 8K30)Mandatory (DP 1.4a, min 2x 4K60 or 1x 8K30)Mandatory (DP 2.1, min 2x 8K60 or 1x 16K30)
Power Delivery15W minimum, up to 240W (optional)100W charging minimum (mandatory)240W charging support (mandatory)
Official CertificationOptional (USB-IF)Mandatory (Intel)Mandatory (Intel)
CompatibilityWorks with all USB-C devices, no Thunderbolt 1/2 supportBackward compatible with all USB standards + Thunderbolt 3/4/5Backward compatible with all USB standards + Thunderbolt 3/4/5
Cable LabelUSB trident logo + speed mark (20G/40G/80G)Lightning bolt logo + number 4Lightning bolt logo + number 5
Average Price (2m cable)$10–$30$25–$50$40–$80

 

Core Differences You Actually Care About

1. Bandwidth & Cable Performance

The biggest catch with USB4 is that speed is tiered, and uncertified cables often advertise “USB4” but only deliver the base 20Gbps speed. Thunderbolt 4 requires all cables to hit 40Gbps minimum, while Thunderbolt 5’s optional 120Gbps asymmetric mode is purpose-built for large video file transfers and external graphics card (eGPU) use.

 

2. Video Output Capabilities

This is the most common pain point for buyers: video output is not guaranteed on USB4 cables. Many budget USB4 cables only support data transfer, and will not work with monitors or docking stations. All Thunderbolt 4/5 cables mandate DisplayPort Alt Mode support, so they work with every USB-C display out of the box.

 

3. Cross-Device Compatibility

Thunderbolt cables are universally backward compatible: you can use a Thunderbolt 5 cable with a USB4 SSD or USB 3.2 phone and it will work at the device’s maximum supported speed.
The reverse is not true: a USB4 cable plugged into a Thunderbolt port will only run at USB4 speeds, and cannot support Thunderbolt-exclusive features like eGPUs or Thunderbolt RAID storage.

 

Frequently Asked Questions

  1. Do I need Thunderbolt 5 if I only use a 4K monitor?
    No. A certified 40Gbps USB4 cable with video support will work perfectly for 4K60 displays, and costs half the price of a Thunderbolt 5 cable.
  2. Can I use a Thunderbolt cable for USB4 devices?
    Yes. All Thunderbolt 4/5 cables work with USB4, USB 3.2, and USB 2.0 devices with no performance loss.
  3. How do I avoid fake cables?
    Only buy cables with the official USB-IF or Intel Thunderbolt logo printed on the connector. Unbranded cables often advertise false speed/feature claims.

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