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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?

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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.

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  • So I won't get even a stationary tear at some line if all screens run at 60 Hz? Because that's the problem I have now using a all-in-one-pc with hdmi-out. Only the primary display is tear-free and the secondary (TV running at same 60Hz) has a stationary tear. I'm hoping using a Nettop with a HDMI-splitter will solve the problem completely without any kind of tear on any of the displays. Is that so? Jan 18, 2013 at 15:04
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    How are they set up, as a cloned display, or as separate displays? That really depends on what graphics card you have, and if the drivers allow different monitors to be synchronized to different vsync rates. Jan 18, 2013 at 15:06
  • Intel HD 4000 with cloned displays. But I'm thinking of replacing this AIO with a Nettop with HDMI-splitter if that Will be a solution. Jan 18, 2013 at 15:27
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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.

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