1.雷电2：
Thunderbolt 2于2013年发布，这是Thunderbolt标准的第二版。与Thunderbolt一样，它基于Apple开发的Mini DisplayPort连接器，这意味着它与任何USB端口兼容，并且其电缆也不适用于Thunderbolt 3端口。 Thunderbolt 2的最大吞吐量为20 Gbps，是Thunderbolt吞吐量的两倍，是Thunderbolt 3吞吐量的一半。
2.雷电3：
Thunderbolt 3于2015年发布。它是Thunderbolt的最新，最快版本，可提供40 Gbps的最大吞吐量。与Thunderbolt 2不同，在Thunderbolt 3中使用USB Type-C连接器，并且向后兼容USB 3.1。它还为该设备提供100 W的功率。
我们可以区分Thunderbolt 2和Thunderbolt 3端口。如果端口形状像mini DisplayPort，则肯定是Thunderbolt 1或2。如果端口形状像USB C，则它是Thunderbolt 3端口。
Thunderbolt 2和Thunderbolt 3之间的区别：
| S.NO | Thunderbolt 2 | Thunderbolt 3 |
|---|---|---|
| 1. | In Thunderbolt 2, Apple’s mini DisplayPort connector is used. | Whereas in thunderbolt 3, Type-c connector is used. |
| 2. | It is provides a maximum throughput of 20 Gbps. | While it can provides double throughput of thunderbolt 2 which is 40 Gbps. |
| 3. | It is two bi-directional 10 Gbps channels is provided. | Whereas in thunderbolt 3, two bi-directional 20 Gbps channels is provided. |
| 4. | Thunderbolt 2 is not backward compatible with USB-C. | Whereas thunderbolt 3 is backward compatible with USB-C. |
| 5. | Thunderbolt 2 is not backward compatible with USB 3.1. | Whereas thunderbolt 3 is backward compatible with USB 3.1. |
| 6. | Thunderbolt 2 is slower than thunderbolt 3. | Whereas thunderbolt 3 is faster than thunderbolt 2. |
| 7. | Thunderbolt 2 port provide very low power to any connected device as compared to thunderbolt 3 port. | Whereas thunderbolt 3 port can provides maximum 100 W power to any connected device. |
| 8. | Thunderbolt 2 ports do not support USB 3.1 generation 2 and thunderbolt 3. | Whereas the thunderbolt 3 ports support USB 3.1 generation 2 as well as thunderbolt 3. |
| 9. | Thunderbolt 2 can support one 4K monitor per port. | Whereas it can support one 4K monitor at 120 Hz or two monitors at 60 Hz per port. |
| 10. | In thunderbolt 2 protocol 4x PCI express 2.0 and DisplayPort 1.2 are used. | Whereas in thunderbolt 3, protocol 4x PCI express 3.0, HDMI-2, USB 3.1 generation-2 and DisplayPort 1.2 are used. |