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What is Thunderbolt, and is it different from USB-C?

Thunderbolt is a type of hardware interface technology that is used to connect various devices to a PC. You’ve likely already seen Thunderbolt in the form of its distinctive ports and cables — the latest generations use the USB-C connector. That’s the quick definition. But if you’re here, you’re probably looking for a more comprehensive explanation of what Thunderbolt is, and why it differs from USB-C.

In this guide, that’s exactly what you’ll get: We’ll go over some of its current iterations and how they compare, how Thunderbolt is different from USB-C, how to identify Thunderbolt ports, and find out the latest on when Thunderbolt 5 will launch. Now let’s take a closer look at Thunderbolt.

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Thunderbolt 3 vs. Thunderbolt 4

Close up of ports on a 2016 MacBook Pro.
Bill Roberson/Digital Trends

Since Thunderbolt was introduced in 2011, there have been a number of different versions of it. But these days, if you’re shopping for a device that features Thunderbolt’s use, you’re probably looking at Thunderbolt 3 and Thunderbolt 4.

Introduced in 2015, Thunderbolt 3 features a USB-C connector, a max transfer speed of 40GB/s, and up to 15W of power for running accessories. It can also support one 4K display and is compatible with USB4 specification.

Launched in 2020, Thunderbolt 4 is the latest version of its connection technology that’s currently available. Thunderbolt 4 still has the same max transfer speed as Thunderbolt 3: 40Gb/s, but it mandates that as the minimum, whereas for Thunderbolt 3, it’s not enforced. Like Thunderbolt 3, Thunderbolt 4 also has a USB-C connector and offers up to 15W power delivery for accessories. But that’s where the similarities between the two pretty much end.

Unlike Thunderbolt 3, Thunderbolt 4 can support two 4K displays and is rated as “compliant” for USB4 specification. Thunderbolt 4 also has double the PCIe SSD bandwidth speed (32 Gb/s) of Thunderbolt 3 (16 Gb/s).

Is Thunderbolt the same as USB-C?

Rear view of an iMac sitting on a white table next to a potted plant. A view in which you can see the iMac's selection of ports.
Dan Baker/Digital Trends

No. Though Thunderbolt has recently incorporated the use of USB-C connectors, they’re still different connection technologies. So just because Thunderbolt 3 and 4 ports are designed for use with USB-C connectors, not all USB-C ports are designed to support Thunderbolt.

Do Thunderbolt and Thunderbolt 2 accessories work with Thunderbolt 3?

Close up of white Thunderbolt cables on a white background.
Image used with permission by copyright holder

They can, but not without help. Thunderbolt 3’s USB-C connection isn’t compatible with devices based on Thunderbolt or Thunderbolt 2 without an expensive adapter.

How do I know if I have a Thunderbolt port?

There are two main ways to know: You can either see if there is a thunderbolt icon next to your device’s USB-C port or you can check your device’s tech specs online to see if it mentions Thunderbolt ports in the product description.

When will Thunderbolt 5 launch?

While Intel officially introduced Thunderbolt 5 in September 2023, the exact launch date for Thunderbolt 5 has not been announced yet. Thunderbolt 5-based products are currently expected to begin their release at some point in 2024.

We’ll update this section once we know more.

Anita George
Former Digital Trends Contributor
Anita George has been writing for Digital Trends' Computing section since 2018. So for almost six years, Anita has written…
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