The Ultimate USB-C Buying Guide

Two USB-C cables can look identical and perform completely differently. The connector shape tells you almost nothing about what's actually inside.

The one thing to understand

USB-C describes the physical connector shape — it says nothing on its own about charging speed, data transfer speed, or video support. A cheap USB-C cable and an expensive one can plug into exactly the same port while performing very differently underneath.

What actually varies

• Charging speed (Power Delivery): cables and chargers are rated in watts — a cable rated for lower wattage will charge slowly, or cap the speed, even with a fast charger on one end. Look for the wattage explicitly printed or listed, not just "USB-C" on the box.
• Data transfer speed: some USB-C cables and ports only support USB 2.0-level speeds, while others support USB 3.2, USB4, or Thunderbolt at far higher speeds — this matters a lot for external drives, but not for charging a phone.
• Video output: not every USB-C port supports outputting video to a monitor — check for "DisplayPort Alt Mode" or Thunderbolt support if you plan to connect a display.

Buying tips

Match the cable to the job: a basic charging cable for a phone doesn't need Thunderbolt speeds, but an external SSD absolutely does. For laptops that charge over USB-C, check the laptop's required wattage and buy a charger and cable rated at or above it — undercharging can mean the battery slowly drains even while "charging" under heavy use.