In the fast-paced world of technology, terms like USB-C, USB 3, and Thunderbolt can spark confusion. These standards define connector shapes, data speeds, and power delivery. As experts in connectivity tech, we've broken it down clearly to help you choose wisely.
These aren't interchangeable versions—they describe distinct aspects of USB tech: letters for physical connectors, numbers for data protocols and speeds.
Traditional USB-A ports are the familiar 12mm-wide rectangles still common on computers. While speeds have advanced, the shape stayed until USB-C arrived.
USB-C cables handle far more power than predecessors and support high-speed data transfer. Many also enable bi-directional charging, powering one device from another.
Numbers indicate data transfer generations. USB 3.0, the third major iteration, boosted speeds tenfold over USB 2.0. Ports look like USB 2.0 but in blue.
Updates like USB 3.1 and 3.2 brought Gen 1 (5 Gbps), Gen 2 (10 Gbps), and Gen 2x2 (20 Gbps)—each faster than the last.
Thunderbolt isn't USB—it's Intel's certified high-speed protocol for data, video, and power. Fewer devices support it due to certification requirements.
It uses reversible USB-C-shaped ports (8.4mm) marked by a lightning bolt. If no Thunderbolt device connects, it falls back to USB speeds.
Thunderbolt 3 leads at 40 Gbps. USB 3.2 trails: Gen 1 at 5 Gbps, Gen 2 at 10 Gbps, Gen 2x2 at 20 Gbps.
For Thunderbolt performance, seek USB-C ports with the lightning logo on new devices.
Want to know your computer's USB power output? Find out here.
