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Theoretically: If I have a HTPC or Nettop with HDMI-out connected to a HDMI-splitter (one to many) and connect this to a TV and at least one other display, will they all be vertically synched (without image tearing) no matter how many displays there are? How do I know if a splitter supports vsynch? Do all?

Is it normal for a HDMI-splitter to allow cloned mode or is that something other than a standard splitter? I want the same image on all displays and I need all to be vsynched. Also the displays may run with different refresh rates but the will all have 1080p-resolution if that matters.

Is this possible?

Andreas Zita
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2 Answers2

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Vertical synchronization simply locks the software running on the GPU from rendering more frames per second than the display updates (i.e. using Vsync with a 60 Hz display will limit your FPS in any application that is Vsync'd to 60 FPS). This is what prevents tearing, and is irrelevant from an HDMI perspective.

Breakthrough
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I've tested this a bunch recently and using an HDMI splitter solves the tearing problem. I have a motherboard with dual HDMI out and Intel 4000. When using cloned mode, the secondary monitor has horrible tearing, but with several different HDMI splitters I've tried and single monitor mode, I have no tearing on either monitor.

Ivan
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