We were promised one cable to rule them all in the form of USB-C, but instead got a drawer full of identical-looking cords where one charges your laptop in an hour, and the other one takes all day. USB-C is a physical connector, not a performance standard. It's like a container that can hold anything from a slow trickle of water in the form of USB 2.0 to a high-pressure fire hose, which comparatively is Thunderbolt 5.

Most slow device issues aren't hardware failures; they are negotiation failures caused by mismatched cables and ports. Here’s the real way to utilize USB-C to the best of your ability and ensure that you're not risking melting cables or damaging your devices.

What's the issue?

Cables that look the same, that aren't the same

You've probably ended up with tonnes of cheap USB-C cables that have come bundled with your headphones, lamps or any other random tech devices that you've picked up off of Amazon. These cables are made solely for power and can only transmit USB 2.0 data speeds, which is 480 megabytes per second. This creates a major data bottleneck if you actually do want to transfer data at high speeds or if you're using a docking station.

Let's say you use that cable to back up your 2TB NVMe drive. You are literally transferring data at 1/80th of the drive's potential speed.

A way that you can differentiate between these two cables is by looking at the pins inside of the connector. A full-featured cable has 24 pins, whereas a charging cable often only has 4 or 12, leaving the high-speed data lanes empty.

Another issue that you might encounter with USB-C is the wattage gap. High-power USB-C cables that are above 60W require an eMarker chip to tell the charger it's safe to send more juice. If you use a basic 60W cable with a 140W MacBook Pro charger, the handshake will cap the speed at 60W. Your laptop might even discharge while plugged in during heavy-duty gaming or rendering. Sometimes you might get an alert saying that the device isn't charging at all, and this is just down to the fact that the cable isn't powerful enough to transmit the required wattage.

There are now EPR (Extended Power Range) cables which allow up to 240W over USB-C, but only if every link in the chain supports it. But again, this is just another identical-looking USB-C cable.

One of the big selling points of USB-C is the DisplayPort Alt Mode. But this can cause even more frustration and confusion, too. If you plug your laptop into a USB-C monitor and nothing happens, this might be because not every single USB-C port supports Alt Mode or Video Out Mode. Many budget laptops use data-only USB-C ports that can't transmit video signals at all. Similarly, many standard charging cables don't have the high-frequency shielding required to carry a 4K 144Hz video signal. You need a cable rated specifically for 10GB/s or higher to reliably drive a monitor.

With so many cables that perform so many different functions but all look exactly the same to the naked eye, it's frustrating that this is the pivot that occurred when we swapped over to USB-C. I'd much rather be able to tell the difference between my cables at a glance than have to look for tiny markers or pins on the inside of the cable to be able to tell if it's the one I'm looking for.

What's the solution?

Labels, lot of labels

So, what's the solution to the problem? Well, port labeling would be a step in the right direction, and this is slowly but surely making the rounds. Right now, manufacturers often don't label their ports. One might be Thunderbolt 4 and transmit at 40 GB/s, while the one next to it is USB 3.2 and only 5GB/s. This means that plugging a docking station into the wrong port can bottleneck your Ethernet, external drives, and monitors all at the same time.

Some ports on your laptop or device will be labeled, so it's worth double-checking what these icons mean when you're plugging your devices into them. You can also use Device Manager on Windows or System Report on Mac to identify the actual controller behind each physical port on your device.

Another step you can take is checking for logos. You'll see that the Super Speed symbol signified by an "SS" or the Lightning Bolt symbol, which means Thunderbolt. This is typically the easiest way to tell what cable is what, with these symbols usually being on housing.

Another way you can know which cable performs what is via the length. Cables over 1 meter often drop in speed unless they're active and expensive. If a cable was long and cheap, it's probably not going to perform the same way a shorter and more expensive one will. If you want the absolute best quality when buying cables, be sure to double-check exactly what wattage and data capacity they have. You may find it beneficial to label your cables yourself.

Lastly is buying certified cables. You'll find that there are USB-IF certification logos that have started appearing on packaging in the past couple of years to simplify things. Picking up cables that are certified by USB-IF are a guarantee of higher quality.

USB-C hasn't been all it was set out to be

We just want universal cables, not universal ports

Your device is only as fast as its weakest link, and if your weakest link is a cheap USB-C cable that doesn't actually support data transfer and charges your device at 1% an hour, then it might be time to invest in some better-quality cables. Stop grabbing the first cable you find in the junk drawer. If you want 2026 speeds, you need 2026 spec wiring to go with it.