Steam Machine主机HDMI口可输出4K 120Hz画面，但色彩有巨大牺牲

IT之家2025-11-13

IT之家 11 月 13 日消息，V社今天凌晨公布了 Steam Machine 主机，搭载半定制 AMD Zen 4 架构处理器，采用 6 核心 12 线程设计，搭配半定制 AMD RDNA 3 架构显卡，运行 Steam OS 操作系统，预计将在 2026 年初开售。V社将这款主机的目标画质定为 4K 60 帧，不过这台主机配备有 DisplayPort 1.4 接口，理论上最高能输出 8K ...

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of the Steam Machine host can output 4K 120Hz pictures, but there is a huge sacrifice in color","themeId":null,"isJumpTheme":false,"ttsUrl":null,"symbols_score_info":{"AMD":0.82},"content_text":"IT之家 11 月 13 日消息，V社今天凌晨公布了 Steam Machine 主机，搭载半定制 AMD Zen 4 架构处理器，采用 6 核心 12 线程设计，搭配半定制 AMD RDNA 3 架构显卡，运行 Steam OS 操作系统，预计将在 2026 年初开售。V社将这款主机的目标画质定为 4K 60 帧，不过这台主机配备有 DisplayPort 1.4 接口，理论上最高能输出 8K 60Hz 画面，也可输出 4K 240Hz。不过需要注意的是，这台主机的定位是放在客厅的游戏机，而大部分电视机并没有 DisplayPort 接口，一般情况下都只能通过 HDMI 接口输入，而 Steam Machine 主机的 HDMI 接口仅为 2.0 标准，理论带宽上限是 18Gbps，意味着电视端输出性能只能达到 4K 60Hz。但这台主机内置的 RDNA 3 显卡完全有能力输出 4K 120Hz 画面，而且如今许多具备 HDMI 2.1 接口的电视都具备 120Hz 显示能力，看起来略显遗憾。据数毛社（Digital Foundry）今天报道，他们最近前往V社总部近距离测试 Steam Machine 时，官方工程师确认这台主机能通过 HDMI 接口输出 4K 120Hz 画面。从技术实现来看，HDMI 2.0 标准也能传输 4K 120Hz，但由于带宽受限，因此在画面上会有巨大牺牲，例如在这种标准下显示画面的色彩抽样只能达到 4:2:0，相比常见的 4:2:2 会显著降低色彩质量，并且只能输出 SDR（标准动态范围）画面，完全无法支持 HDR。不过从另一个角度看，Display Port 接口可以很轻松地转换为 HDMI 接口，因此我们还是要等这台主机上市后才能知晓它到底能不能输出 4K 120Hz 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