Thunderbolt 5 vs USB4 v2: Speeds, Features and Differences

Thunderbolt 5 is Intel's certified implementation of USB4 Version 2.0, with stricter requirements. Both run at 80 Gbps in each direction, and both can shift to 120 Gbps in one direction (with 40 Gbps back) for video-heavy setups. USB4 v2 is the open specification; Thunderbolt 5 is the branded product that adds certification and a fixed feature floor. As of October 2026, that is the practical difference.

The short answer

• Speed: the same signalling underneath, 80 Gbps symmetric or 120 Gbps/40 Gbps asymmetric.
• Who defines it: USB4 v2 comes from the USB Promoter Group and USB-IF; Thunderbolt 5 is Intel's brand and certification programme built on it.
• What you can count on: a port labelled USB4 v2 only guarantees what the manufacturer chose to build. A Thunderbolt 5 port should meet Intel's minimum feature list.
• Compatibility: both fall back to older USB, USB4 and Thunderbolt devices at the speed the weaker side supports.

What USB4 Version 2.0 added

The USB-IF describes USB4 as a way to share one high-speed link between several kinds of traffic, such as data and display, and it lists operation of up to 80 Gbps over 80 Gbps certified cables. Version 1.0 topped out at 40 Gbps. According to the USB4 article on Wikipedia, the USB Promoter Group published Version 2.0 in October 2022 and added an 80 Gbps symmetric mode plus an asymmetric mode of 120 Gbps in one direction and 40 Gbps in the other.

The speed jump comes from PAM-3 signalling, which lets 80 Gbps run over the same type of passive 40 Gbps cable in short lengths. Passive full-featured cables are estimated to reach about 0.8 m at these speeds, and active cables need a new speed grade, so an older cable may not reach 80 Gbps.

Other changes in v2 include:

• DisplayPort 2.1 tunnelling, with support up to UHBR20 (80 Gbps of display bandwidth). The spec does not make every DisplayPort rate mandatory.
• PCIe tunnelling updates: the 128-byte payload limit of v1 is removed, and the spec references PCI Express 5.0.
• USB 3 Gen T tunnelling, which replaces classic USB 3.2 tunnelling and can exceed 20 Gbps.
• New logos and names that show maximum bit rate and wattage.

What Thunderbolt 5 adds on top

Intel previewed Thunderbolt 5 (codename Barlow Ridge) in September 2023 and describes it as built on USB4 v2. Per the Thunderbolt article on Wikipedia, its headline features are:

• 80 Gbps symmetric, with a 120 Gbps/40 Gbps asymmetric mode that Intel markets as Bandwidth Boost.
• DisplayPort 2.1 support, including dual 8K displays at 60 Hz.
• PCIe Gen 4 x4 for 64 Gbps of PCIe throughput, double Thunderbolt 4. According to the same article, the required minimum for the PCIe link stays at 32 Gbps, as with Thunderbolt 4.
• Up to 240 W of downstream charging.

Thunderbolt 5 also carries the Thunderbolt 4 habit of certifying the whole port. Optional USB4 features vary between products, while a Thunderbolt-certified port must meet the published minimums. Check the exact minimums with the manufacturer or in Intel's Thunderbolt materials before buying hardware, since the figures above come from a secondary summary.

Thunderbolt 5 vs USB4 v2 vs Thunderbolt 4 at a glance

Thunderbolt 4

Thunderbolt 4 runs at 40 Gbps and builds on USB4 v1. Its certification sets a floor of 32 Gbps for PCIe data. It is the safe pick for docks and external SSDs on current laptops.

USB4 v1 (40 Gbps)

Many laptops advertise only "USB4". The spec leaves some features optional, so two ports labelled USB4 can differ in what they support, including docks and external graphics enclosures. The product page or manual is the only reliable guide.

USB4 v2 (80 Gbps)

USB4 v2 ports can reach 80 Gbps and 120 Gbps asymmetric, but optional features still vary by manufacturer.

Thunderbolt 5

The same top speeds, with Intel certification and the feature set listed above. Because the signalling is shared, a Thunderbolt 5 host works with USB4 v2 devices.

Cables and the logo problem

Cables cause most of the confusion. Thunderbolt 3 cables cannot carry the 80 Gbps mode, and Thunderbolt 4 cables run at 40 Gbps. To get 80 Gbps, buy a cable marked for Thunderbolt 5 or for 80 Gbps USB4 v2. The Wikipedia summary notes that existing short passive cables can carry 80 Gbps over PAM-3, but buy a cable that is explicitly rated for the speed rather than relying on that.

Charging is separate from data speed. A cable rated for 240 W is not automatically an 80 Gbps data cable, and the reverse holds too.

Which devices support them

Intel's 80 Gbps Barlow Ridge controllers include the JHL9580 for computers and the JHL9480 for peripherals. Apple introduced its first Thunderbolt 5 Macs in October 2024 (Mac mini with M4 Pro, and MacBook Pro with M4 Pro and M4 Max), with the Mac Studio following in March 2025, according to Wikipedia. For any Windows laptop, desktop or motherboard, read the port label and the spec sheet, because support depends on the board maker as well as the chip. For the chip side of this story, see our chips coverage and the broader industry section.

The PCIe numbers matter if you run an external GPU enclosure or fast NVMe drive. Our explainer on PCIe generations and their speeds shows what a Gen 4 x4 link means in practice.

Should you wait for 80 Gbps?

For most people, 40 Gbps is enough: a single 4K or 5K monitor, a dock and an NVMe SSD all fit. Thunderbolt 5 and USB4 v2 matter for two or more high-refresh displays, 8K output, and fast storage arrays. New product reveals tend to land at launch events, where port specs are usually listed.

Do not assume a port supports the full spec because the connector looks identical. Every USB4 and Thunderbolt port uses USB-C.

Frequently asked questions

Is Thunderbolt 5 the same as USB4 v2?

No. Thunderbolt 5 is built on USB4 v2 and shares its 80 Gbps and 120 Gbps modes, but it adds Intel certification and a stricter minimum feature set. USB4 v2 is the open specification.

Is USB4 2.0 faster than Thunderbolt 5?

No. Both reach 80 Gbps symmetric and 120 Gbps in one direction. Real speed depends on the host, device and cable.

Can I use a USB4 v2 device on a Thunderbolt 5 port?

Generally yes, because the two share the same signalling and fall back to the best mutual speed. Which features work still depends on the device.

Do Thunderbolt 4 cables work with Thunderbolt 5?

They work, but at 40 Gbps rather than 80 Gbps. You need a cable rated for Thunderbolt 5 or 80 Gbps USB4 v2 for full speed.

How fast is Thunderbolt 5 for PCIe devices?

Thunderbolt 5 uses PCIe Gen 4 x4, which gives up to 64 Gbps of PCIe throughput, double the Thunderbolt 4 figure.