Thunderbolt 4 guarantees 40Gbps, dual 4K display minimum, PCIe x4 for storage, and daisy-chaining up to 6 devices with stricter certification than TB3.
| Pin | Name | Function | Type |
|---|---|---|---|
| A1 | GND | Ground | GND |
| A2 | TX1+ | 20Gbps TX1 positive | BUS |
| A3 | TX1- | 20Gbps TX1 negative | BUS |
| A4 | VBUS | Power | PWR |
| A5 | CC1 | Config channel 1 | BUS |
| A6 | D+ | USB 2.0 D+ | BUS |
| A7 | D- | USB 2.0 D- | BUS |
| A10 | RX2- | 20Gbps RX2 negative | BUS |
| A11 | RX2+ | 20Gbps RX2 positive | BUS |
| B2 | TX2+ | 20Gbps TX2 positive | BUS |
| B3 | TX2- | 20Gbps TX2 negative | BUS |
| B5 | CC2 | Config channel 2 | BUS |
| B10 | RX1- | 20Gbps RX1 negative | BUS |
| B11 | RX1+ | 20Gbps RX1 positive | BUS |
Thunderbolt 4 guarantees 40Gbps, dual 4K display minimum, PCIe x4 for storage, and daisy-chaining up to 6 devices with stricter certification than TB3.