Unverified90% confidenceTradeoffTime unknown
USB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
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90%
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Long-term
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Unverified外置USB卡即插即用、跨设备灵活但受USB带宽限制且有延迟；内置PCIe卡性能强延迟低但只能装台式机且占用扩展槽——笔记本用户或多设备切换选外置，固定录制台式机选内置89% 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88% 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87% similarUnverified电竞用途优先选PCIe接口网卡而非USB，PCIe直连主板总线延迟更低且供电稳定，USB网卡在高负载下易出现丢包和延迟抖动86% similarUnverifiedUSB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85% similar
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