VGA is subject to RFI noise. Why? It's analog. The end.
In my old location, I had almost no issue with noise over VGA. In my new location, VGA had major interference patterns. It's all about the power you're getting, ambient RF in your area, and (to a lesser extent) the devices in use. All but one of my devices was clearly fine, since it works fine for years.
DVI has no such issues. It's digital.
Is Starview the same as StarTech? No idea. Do not assume this. Verify it.
Notes:
- The audio on the Starview KVM was terrible. It had noise. I have multiple speakers for my system anyway, so I can continue hearing audio as I switch. It was not needed.
- The keyboard would sometimes stick for the shift key if held down too long, and you'd have to simply switch the KVM to another system and back again.
You cannot make VGA into DVI. The adapter does not work the way that you're thinking.
Mmmm... soup...