Unverified90% confidenceDecision RuleTime unknown
Thunderbolt 3/4接口的PCIe带宽仅为x4（约32Gbps实际约22Gbps可用），会导致高端显卡损失10%-30%性能，故不建议为RTX4090/5090等旗舰卡配eGPU
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Unverified外置显卡盒的性能损耗普遍在10%-25%之间，因雷电4带宽仅40Gbps（实际PCIe通道约32Gbps，等效PCIe 3.0 x4），高端显卡如RTX 4080/4090会被带宽严重瓶颈，实际得益远低于台式机安装83% similarUnverified采用NVMe协议通过Thunderbolt 3通道传输，理论带宽上限约2750-2800MB/s，已接近Thunderbolt 3的40Gbps带宽实际可用上限79% similarUnverifiedThunderbolt 3/4扩展坞性能强但兼容性挑剔，价格高，仅在需要40Gbps带宽（如外接高速SSD、双4K屏、eGPU）时才值得，普通用户USB3.2 Gen1的扩展坞足够78% similarVerifiedThunderbolt 3/4接口提供40Gbps双向带宽，5K@60Hz视频信号约需22Gbps77% similar
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