Tag Archives: video

DVI De-Mystified – Dual-Link DVI versus Single-Link DVI Explained!

DVI Dual vs SingleToday I was doing some spec hunting for my PC, trying to track down exactly what make, model and frequency were supported by the Wi-Fi card that came with my machine. As I was doing so, and eyeballing the rest of the specs, I ran across the information for my video card. One thing that caught my eye was the description of the video or DVI port. Specifically it mentioned that the DVI port was a ‘dual-link’ DVI port. Well now, I consider myself pretty knowledgeable about computers, including hardware, but I hadn’t heard of a ‘dual-link’ DVI port before. Now, in my defense, I have spent the last many years concentrating on hardware by Sun, Hitachi, NetApp and the like. Things you will find in a full up data center, not at home in your desktop PC. I haven’t been knee deep in PC tech for a while, but I have kept up with most things.

So, naturally, I had to find out what ‘dual-link’ meant. I did some searching and found a wonderful article that explains what ‘dual-link’ is, what ‘single-link’ is, the differences between them and more. I am going to give you a brief summary (I don’t want to keep everyone in suspense), but I am also including a link to the original article, go read it and really get learned up.

Basically, the way I see it (the quick version) is like this:

  • Dual-Link DVI
    • Has 24 pins in the plug instead of 18
    • It uses two TMDS digital signal transmitters instead of one
    • It can transmit data faster using 8 wires instead of 4
    • It can support much higher resolutions up to 2560×1600
    • There is an increase in signal quality and refresh rates


  • Single-Link DVI –
    • Has 18 pins in the plug instead of 24
    • It has one TMDS digital signal transmitter
    • It transmits data of 4 wires instead of 8
    • It cannot support resolutions beyond 1920×1200
    • Basic signal quality and refresh rates are observed

And there you have it, a run down of the basic differences between ‘dual-link’ and ‘single-link’ DVI. I think finding out and learning information like this is way cool. I love to learn new things and figure out how stuff works, it’s a lot of fun in my book – but then, more than a few people have called me crazy because a day of fun to me is sitting and coding all day! LOL

DVI All Types
DVI Plugs
All Types
(Click to enlarge)
DVI - All Types of Plugs
DVI Plugs
All Types
(Click to enlarge)

Now, for the sake of completeness, even though this doesn’t really apply to the dual-link or single-link question, I wanted to include another image or two that show other versions of the DVI plug. Since you are likely to run into one or all of these plugs out there somewhere, I figured you might want to know what you are looking at. These two pictures (click to enlarge), show you that aside from the digital DVI-D plugs, there are also DVI-I plugs that are analog and digital, plus some other older plugs. Of these older plugs, the Super-VGA there on the bottom is very common and one that you probably will see a lot. It was used for many years before the DVI option became common. I have seen many video cards that have DVI and VGA on the same card.

Check out the article on DVI dual-link versus single-link here.

Don’t count on Corel for support

Thought I would pass this along for anyone wishing to part with some of their hard earned duckets for some software and expected some type of semblance of support from the company that makes it.  I purchased a product for video editing from Corel called Ulead Video Studio (I guess they bought Ulead like they bought Jasc with Paint Shop Pro).  Now, the product is pretty nice when it works, I say when it works because it’s always been fairly buggy but reliable enough that I didn’t complain.  At the very least it always installed fine when I had to rebuild my machine after Windows decided eating itself was a good idea or something of that nature.  That is until today … when the actual install completes, but it will not accept my product key saying that it is incorrect.  At first I thought it was just one of those situations where I have installed it enough times that I have to have a counter reset somewhere before it will activate again or something like that.  I noticed also though, that no patches would install either, saying that it couldn’t find the product installed on my system anywhere.  That was pretty odd I thought, maybe it’s a Windows 7 thing, who knows.  Either way, even though my product is a couple years old, it wasn’t cheap and we aren’t talking in depth support here (at least on the surface), I just need to activate the thing.  So, I go to Corel’s web site and log in, go to the support section, fill out the long ass form with technical details, hardware specs, screen shots, and lots of other stuff.  It was a pretty involved form, but that’s OK, it will help get the problem resolved right?  Wrong.  I couldn’t even submit the form to get an email to the support staff, I was instead immediately presented with a message that any product that is too old, which they define as more than two versions back, cannot be supported.  That’s it, zip, nada, nil, nothing.  I can’t even ask the damn question.  All I want to do is activate my software that I bought and paid for, and instead I get snubbed and told to go away.  I can tell you one thing for sure, aside from the fact that I will figure this out on my own, and that is I won’t be purchasing any more products that have anything to do with Corel again.  They put out new versions at a frenetic pace, and now I know why.  I had wondered in the past why they released new versions of their software with only seemingly minor changes at the rate of one to three per year.  I think I have my answer you could check here.  That being said, beware you don’t get stuck like I did.