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The HDMI 1.4 standards supports pixel clocks up to 340 MHz, and this is what allows it to display resolutions like 2560x1600@60Hz (268 MHz pixel clock) or 3840×2160@30Hz (297 MHz pixel clock). For 4k@60Hz, HDMI 2.0 and a 600 MHz clock is required. The ThinkPad Edge 300's HDMI port, however seems to be limited to a 165 MHz (HDMI 1.0-1.1) pixel clock, while ...

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