Glossary / USB-C
Thunderbolt 4
A strict superset of USB4 — guaranteed 40 Gbps, PCIe, dual-4K.
Thunderbolt 4 is a connectivity standard that is a strict superset of USB4: it guarantees 40 Gbps, PCIe tunneling, and dual-4K (or single-8K) display support over a USB-C connector. Genuine Thunderbolt 4 requires a certified cable and host. Cablyst reads whether a Thunderbolt 4 link is actually active on your port.
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 5 USB4 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