Thunderbolt is a hardware interface
that combines data, video, audio, and power in a single connection.
Thunderbolt combines PCI Express (PCIe) and DisplayPort (DP) into
one serial signal, and additionally provides DC power, all in one
cable.
Thunderbolt 1 and Thunderbolt 2 use the same connector [1] as miniDP
(DisplayPort) to connect to peripherals, while Thunderbolt 3 uses
a USB Type-C connector [2].
Figure 1. Thunderbolt 1 and Thunderbolt 3
Thunderbolt 1 and Thunderbolt 2 (using a miniDP connector)
Thunderbolt 3 (using a USB Type-C connector)
Thunderbolt 3 over USB Type-C
Thunderbolt 3 brings Thunderbolt to USB Type-C at speeds up to 40
Gbps, creating one compact port that does it all - delivering the
fastest, most versatile connection to any dock, display or data
device like an external hard drive. Thunderbolt 3 uses a USB Type-C connector/port to
connect to supported peripherals.
Thunderbolt 3 uses USB Type-C connector and cables - It is compact and reversible
Thunderbolt 3 supports speed up to 40 Gbps
DisplayPort 1.2 – compatible with existing DisplayPort monitors, devices and cables
USB Power Delivery - Up to 130W on supported computers
Key Features of Thunderbolt 3 over USB Type-C
Thunderbolt, USB, DisplayPort and power on USB Type-C on a single
cable (features vary between different products)
USB Type-C connector and cables which are compact and reversible
Supports Thunderbolt Networking (*varies between different products)
Supports up to 4K displays
Up to 40 Gbps
NOTE Data transfer speed may vary between different devices.
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