What Is USB4? A Straightforward Guide
USB4 is the current generation of USB — the standard now used on most new laptops, docks, and USB-C cables. Unlike previous USB updates, USB4 isn't just about speed: it merges data, video, and power delivery into a single, more predictable connector standard. Here's what it actually means for you.
The short answer
USB4 lets one USB-C cable carry data, display output, and device charging simultaneously — and do it fast. There are two versions in the market right now:
- USB4 (original, 2019): up to 40 Gbps
- USB4 Version 2.0 (2022 spec, now shipping in current hardware): up to 80 Gbps, with an optional asymmetric mode reaching 120 Gbps for demanding display setups
Both fall under the "USB4" name, so the version — and the cable rating — matters more than the label alone.
What USB4 actually changes
- One port, multiple jobs. USB4 combines USB data transfer, DisplayPort video, and USB Power Delivery over the same USB-C connector, so a single cable can run an external monitor, transfer files, and charge your laptop at once.
- Thunderbolt compatibility. USB4 is built on the Thunderbolt protocol, and USB4 Version 2.0 is compatible with Thunderbolt 5 — good news if you're mixing devices from different manufacturers.
- Much higher bandwidth. 40 Gbps (or up to 80–120 Gbps on Version 2.0) is enough for high-refresh 4K and 8K displays, fast external SSDs, and eGPU setups that older USB standards couldn't handle cleanly.
- Up to 240W of power delivery, enough to charge demanding laptops through the same cable carrying your data and video.
USB4 vs USB4 Version 2.0 vs older standards
| Standard | Max Bandwidth | Max Power Delivery | Typical Use |
|---|---|---|---|
| USB 3.2 Gen 2x2 | 20 Gbps | 100W | External drives, docks |
| USB4 (v1.0) | 40 Gbps | 100W | Dual 4K displays, fast SSDs |
| USB4 Version 2.0 | 80 Gbps (120 Gbps asymmetric) | 240W | 8K displays, eGPUs, high-end docks |
| Thunderbolt 4 | 40 Gbps | 100W | Cross-brand compatibility |
What to check before buying a USB4 cable or device
- Check which USB4 version your device actually supports — a laptop with a USB4 port doesn't guarantee Version 2.0 speeds; check the manufacturer's specs.
- Match your cable to your bandwidth needs. Higher-speed USB4 Version 2.0 performance requires cables specifically certified for it — an older 40 Gbps cable will simply cap your connection at the lower speed.
- Confirm power delivery requirements, especially for power-hungry laptops — not every USB4 cable or charger supports the full 240W ceiling.
LINDY's recommendation
For everyday laptop, display, and storage use, a certified USB4 cable rated to at least 40 Gbps covers the vast majority of setups. If you're running high-refresh 8K displays, an eGPU, or need maximum charging speed, look specifically for USB4 Version 2.0 certified cables and confirm your devices support it — the bandwidth means nothing if the hardware on either end can't use it.
Need help choosing the right USB4 cable or accessory? Contact our team on 1300 888 095 or browse our USB-C and USB4 range.
