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TB4/USB4扩展坞总带宽固定40Gbps，若同时外接双4K显示器（约需20Gbps）+ 高速SSD + 千兆网口，带宽会被抢占导致SSD降速，重度多设备需优先选TB4并接受传输降速

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Unverified带宽是共享的：雷电4总带宽40Gbps，若同时接4K显示器（占大量带宽）+高速SSD，SSD读写速率会明显下降，重度数据传输选独立带宽接口的拓展坞85% similar UnverifiedTB4/USB4坞在Windows上外接eGPU或高速NVMe硬盘可跑满约2800MB/s，但40Gbps总带宽在显示、以太网、USB、硬盘间共享，同时接双4K屏后留给数据传输的带宽会明显缩水85% similar Unverified多口同时高负载（网口+外接硬盘+4K显示器）时，USB-C（10Gbps）扩展坞会因带宽共享导致降速或断连，此类场景应选雷电4扩展坞（40Gbps）84% similar UnverifiedTB3/TB4带宽标称均为40Gbps，但雷电数据（PCIe隧道）实际可用约22-32Gbps，接雷电固态硬盘阵列时不要期望跑满40G，多设备同时读写会争抢带宽81% similar UnverifiedTB3与TB4扩展坞带宽同为40Gbps，但TB4强制要求支持双4K@60Hz显示输出+最低32Gbps PCIe带宽，TB3无此强制标准，购买老TB3坞需查证是否支持双屏80% similar

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