Retina Z3 unclear screen

[adolescent]

Usually, it's the quality of cables and switchbox.  If it's a simple mechanical switchbox then that's a big problem.  Also, try to use quality cables and keep the length down to a minimum.

[adolescent]

That's a shame, because the Retina Z3 is a nice fast card.  Belkin sells gold plated cables in short lengths.  We use them at work to extend KVM consoles where needed (standard cables tend to add ghosting).