Unverified82% confidenceTradeoffTime unknown
分辨率/帧率越高越吃总线带宽和CPU：外置USB卡做4K60直播时若开硬件编码可省CPU，但便宜的USB卡多为软件编码，会导致主机CPU占用飙高、直播掉帧
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82%
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Long-term
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Unverified低配笔记本(轻薄本无独显)不建议搭配4K60采集设备，采集时CPU软编码占用极高会导致直播掉帧，此类设备应选带硬件编码的采集卡83% 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80% similarUnverified分辨率与帧率越高、延迟越低往往需要PCIe硬件方案，但牺牲了便携性和跨设备通用性；外置USB卡通用但延迟和带宽受限79% similarUnverified带独立硬件编码芯片的采集卡（如Elgato 4K60 Pro MK.2）录制时CPU占用可低于5%，而依赖软件编码的低端卡会占用20%以上CPU，直播同时打游戏时应优先硬件编码型号79% similarUnverified延迟越低通常需要硬件编码或PCIe直连，成本更高且便携性差；纯直播场景延迟不敏感，USB外置卡配直通口即可，无需为超低延迟买内置卡79% similar
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