Unverified90% confidenceDecision RuleTime unknown
USB采集卡受USB带宽限制，1080P60通常是无损上限；若需要真正无延迟的1080P120或4K60直通，必须选PCIe内置采集卡（如4K60 Pro）而非USB外置卡
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90%
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Long-term
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UnverifiedUSB采集卡免驱即插即用、可跨设备便携，但受USB带宽和延迟限制；PCIe卡延迟低画质稳，但仅限台式机且占用一条PCIe插槽，笔记本用户只能选USB方案85% similarUnverifiedUSB 3.0接口采集卡在采集4K60时带宽不足，需要压缩画质，追求4K60无损采集应选PCIe内置卡或USB3.2 Gen2/Type-C全功能接口84% similarUnverified追求4K60HDR无损采集或多路视频源同时采集需选PCIe内置卡（如Elgato 4K60 Pro），PCIe带宽远高于USB，且CPU占用更低，但只能装台式机不能用于笔记本81% similarUnverified笔记本电脑不要选内置PCIe采集卡（无扩展插槽），应选USB3.0外置卡；反之台式机长期高强度直播优先PCIe内置卡，延迟更低且不占USB带宽80% similarUnverified笔记本或无空闲PCIe插槽的设备才考虑USB网卡；有PCIe插槽的台式机/NAS一律优先PCIe网卡，稳定性、发热和满速表现都优于USB方案78% similar
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