I stopped buying random USB‑C cables after learning what 'USB4' actually means

I used to buy cables by price, now I buy them by capability.

I stopped buying random USB‑C cables after learning what 'USB4' actually means

[Close-up of a braided USB-C cable.]

Credit: Christine Persaud / MUO

Oluwademilade Afolabi

Feb 28, 2026, 1:00 PM EST

Oluwademilade is a tech enthusiast with over five years of writing experience. He joined the MUO team in 2022 and covers various topics, including consumer tech, iOS, Android, artificial intelligence, hardware, software, and cybersecurity. In addition to writing at MUO, his work has appeared on HowtoGeek, Cryptoknowmics, TechNerdiness, and SlashGear.

Oluwademilade attended the University of Ibadan in Nigeria, earning a medical degree from the College of Medicine. Excelling in public service, Oluwademilade was honored with the title of Global Action Ambassador by a student organization affiliated with the United Nations. He received this designation in Kuala Lumpur, Malaysia, in recognition of his efforts to make a positive global impact in 2020

In his free time, Oluwademilade enjoys testing new AI apps and features, troubleshooting tech problems for family and friends, learning new coding languages, and traveling to new places whenever possible.

I used to consider USB-C cables as office supplies. Cheap, interchangeable, and unworthy of much thought. A cable is a cable, right? Wrong, as it turns out, embarrassingly wrong. The moment it finally clicked for me was when I plugged a brand-new external SSD into my laptop and watched files crawl across at dial-up speeds. It's the exact same underlying issue that explains why your USB-C cable isn't charging your device fast enough. That was the day I had to stop pretending and ask the obvious question: why does the same USB-C port behave so differently depending on which cable I grab from the pile?

The answer hides in three tiny characters printed somewhere on the box: USB4. Figuring out what those letters and numbers actually mean completely changed how I shop, how I work, and how I look at every single cable stuffed into my drawer.

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The connector shape is the most misleading thing about a USB-C cable

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Looks the same, works nothing alike

USB-C is a connector shape, not a performance standard. That slim, oval port on your laptop looks identical whether it supports blazing-fast data transfer or barely-functional USB 2.0 speeds, and the same is true for cables. A $6 braided cable from a gas station checkout bin fits perfectly into the same port as a certified USB4 cable from Anker or Belkin. They'll both charge your phone. That's where the similarities end, which is exactly why not all USB-C cables are the same.

The USB ecosystem has accumulated generations of standards over the years — USB 2.0, USB 3.0, USB 3.1, USB 3.2, with its bewildering Gen 1, Gen 2, and Gen 2×2 variants — each one capable of using the USB-C connector while delivering completely different real-world performance. A generic USB-C cable almost always runs on USB 2.0 internals, which caps data speeds at 480 Mbps. That's fine for topping up your earbuds, but if you're moving a 4K video project to an external drive, you'll age noticeably waiting for it to finish.

[USB Hub adapter with a white USB cord connected to it]

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What makes this especially frustrating is that there's no visual shorthand to warn you. The port on your device won't change color. The cable won't look thinner. You'd have to read the fine print on the packaging (which, really, most of us simply don't do) to discover that the cable you just bought is, for your purposes, essentially a very expensive charging cord.

This is the exact problem USB4 was designed to solve, and it does so more elegantly than any previous standard has managed.

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USB4 is less a cable standard and more a bundle of superpowers

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All squeezed into a single connector

[Ugreen Revodok Max 213 with cables plugged in]

Hannah Stryker / MakeUseOf
Credit: Hannah Stryker / MakeUseOf

When the USB Implementers Forum introduced USB4 in 2019, built on Intel’s Thunderbolt 3 foundation, the goal was unification. If you're still trying to grasp what USB-C is and whether it will replace all other connectors, the original promise was a single cable for data, video, and power, rather than a tangle of specialized leads. USB4 set out to bring what had previously been niche, professional-grade capability into everyday hardware.

At the spec level, especially if you're looking into USB-C data transfer speeds and how fast it can actually go, USB4 supports data rates of 20Gbps and 40Gbps, with the newer USB4 v2 extending that ceiling to 80Gbps. While 20Gbps is the required baseline, 40Gbps is what you’ll find on most modern laptops. In practical terms, that’s enough bandwidth to move a full 4K movie in seconds. More importantly, it allows external SSDs to operate much closer to their rated speeds, rather than being throttled by aging interface standards.

Speed alone isn’t what makes USB4 compelling. Its defining strength is protocol tunneling, the ability to split a single high-speed connection among USB data, DisplayPort video, and PCIe traffic simultaneously. In everyday use, that means one USB4 cable connected to a dock can power your laptop at up to 100W (or 240W with EPR cables), drive a high-resolution display, and sustain fast transfers to an external drive, all while dynamically allocating bandwidth where it’s needed.

Then came USB4 v2 in 2022, which further advanced the concept. It supports up to 80Gbps and even introduces an optional 120Gbps asymmetric mode. That mode favors downstream bandwidth, which is perfect for ultra-high-resolution displays like 6K or 8K monitors, while still maintaining 40Gbps upstream for data. It’s the kind of engineering aimed squarely at high-end workstations and multi-display setups. Early devices are already here, including laptops such as the Razer Blade 18 and peripherals built around Thunderbolt 5, with wider adoption expected through 2026.

One of the most reassuring parts of USB4 is how well it respects the past. It remains fully compatible with USB 3.x and USB 2.0, and most USB4 hubs also support Thunderbolt 3 devices. Your old flash drive still works. Your new cable still charges your older phone. The ecosystem moves forward, but it doesn’t force you to throw everything out and start from scratch.

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Key performance differences at a glance

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Once you know what to look for on the label, buying the right cable becomes a calm and confident decision

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Your decoder ring for the cable aisle

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