DVI to VGA adapter question.

Harmen_1 · Feb 12, 2016

So i started building Pc's for customers and one of the PNY videocards came with a DVI-VGA adapter and i decided to try it out and i think it looks fine. I was expecting a loss in quality actually or maybe i'm not seeing straight.

Anyway my question is: does a DVI to VGA adapter degrade quality of the signal? If the Videocard outputs DVI-D and sends it through a VGA cable does the signal quality weaken or does it stay the same? Will the signal sent through the VGA cable be digital or analogue?

My guess is it will stay the same, but i'm not sure.

clutchc · Feb 12, 2016

Harmen_1 :

"does a DVI to VGA adapter degrade quality of the signal?" Yes, a bit. But you have to look closely or have them side by side to tell sometimes. Text is easier to read with digital. There is signal loss going from digital signal to analog. Brightness will be less as well. https://cabovga.files.wordpress.com/2009/03/dvi_vs_vga1.jpg

"If the Videocard outputs DVI-D and sends it through a VGA cable does the signal quality weaken or does it stay the same?" First, the DVI output must be DVI-I (integrated) to have a VGA signal present. DVI-D is strictly digital. Same answer as for above.

"Will the signal sent through the VGA cable be digital or analogue?" If the signal leaves the card's DVI-I port via a VGA adapter and a VGA cable, the signal going across the wires in the cable will be analog. Here's why... The DVI-I port on the card has two signals; analog and digital. Look closely at the connector. The 4 round holes to one end with the bar between them are for the analog signal; used only if there is an adapter plugged in. Otherwise, they are not used. http://forum.clubedohardware.com.br/applications/core/interface/imageproxy/imageproxy.php?img=http%3A%2F%2Fi.stack.imgur.com%2F6K4tr.png&key=84af5c1151da1bcda746b61724352555e1d0c3e821327b1ab61726122901e88e

junkeymonkey · Feb 12, 2016

with non dvi-I you need a active adaptor to convert digital to analog -- dvi-I has the extra 4 pins around the flat bar pin that carries the analog signal native

hdmi digital only

dvi-D digital only

display port digital only

you can find all this out like from winkipedia articles on that

example
https://en.wikipedia.org/wiki/Digital_Visual_Interface

Harmen_1 · Feb 12, 2016

Great answers, looks like i was wrong but this al makes sense!

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