Glossary / USB-C
USB4
The USB-C data standard — 20 or 40 Gbps, with optional features.
USB4 is the USB-C data standard that allows either 20 or 40 Gbps and makes several features, such as PCIe tunneling, optional. Unlike Thunderbolt 4, USB4 lets manufacturers ship lower tiers, so a 'USB4' label alone does not guarantee the top speed. Cablyst reads which tier and lane configuration is actually active.
See it on your own cable — install Cablyst, check a cable, or browse the full glossary.
Related: E-marker USB Power Delivery (USB-PD) Extended Power Range (EPR, 240 W) Thunderbolt 4 Thunderbolt 5 DisplayPort Alt Mode VDO (Vendor Defined Object) USB-IF (USB Implementers Forum) PDO (Power Delivery Object) SOP' (cable plug identity) UHBR (Ultra High Bit Rate) Active vs. passive cable