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19" Flat panel VGA or DVI cable

Discussion in 'ATI' started by DB, Apr 6, 2005.

  1. DB

    DB Guest

    I bought a 19" Samsung panel and it works great but was wondering If I would
    see any improvement by using a DVI cable instead of my VGA cable. Anyone
    have any words of wisdom on this? Best buy wants $52 for a DVI cable so I
    don't want to through my money away.

    DB, Apr 6, 2005
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  2. DB

    J. Clarke Guest

    (a) Never, ever buy a cable from BestBuy or CompUSA or the like unless (a)
    you need to see it before you buy it for some reason or (b) you've
    absolutely, positively got to have it _today_.

    The same identical cables (same brand, same part number, same packaging,
    everything) are available online for much, much better prices.

    In the particular case, a DVI-I dual-link cable is available online for
    under 8 bucks, while the Belkin brand that BestBuy likely carries can be
    had for 20. Froogle "DVI Cable".

    (b) I'm surprised that your Samsung didn't come with a DVI cable.

    (c) Whether you see a difference depends on the system--sometimes you do,
    sometimes you don't. With the last Samsung I looked at and a Matrox
    display adapter there was not a noticeable difference.
    J. Clarke, Apr 6, 2005
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  3. DB

    DaveW Guest

    The signal that the LCD monitor actually uses is a digital signal. But
    using the VGA cable you are sending an analog signal which must then be
    converted to digital. Not good. Results in a reduced quality image.
    Get a DVI cable so that you are sending a digital signal to the LCD for
    superior imaging.
    DaveW, Apr 7, 2005
  4. DB

    J. Clarke Guest

    Sez the guy who has never been right once in his life.
    J. Clarke, Apr 7, 2005
  5. DB

    sbb78247 Guest

    I agree with this poast!

    Spent a bunch of money to get DVI and SO WHAT!!! There is not a whole lot
    of difference betwen the analog LCD on this system and the DVI on the other.
    BIG F***** deal.

    sbb78247, Apr 7, 2005
  6. DB

    Frode Guest

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    In my experience, the difference is *significant*. Yet it's not really that
    apparent unless you're able to compare properly.

    When I got an LCD at work I originally plugged it into the VGA. I thought
    the image was stellar. Then, out of curiosity, I got a DVI cable and
    plugged that in as well. I didn't really see much of a difference. Until I
    switched back and forth between them a few times. There difference in
    clarity was huge. The same was the case when I got an LCD at home later on.

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    Frode, Apr 7, 2005
  7. DB

    sbb78247 Guest

    not a world of difference on this one. maybe the monitor or card are crap?
    There is a bit, but not much

    sbb78247, Apr 7, 2005
  8. DB

    Frode Guest

    X-Newsreader: Forte Agent 1.93/32.576 English (American)
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    It might also depend on how your desktop is. I run with dark colors. A lot
    of grey shades. So I can end up with a table window with grey background,
    darker grey separator lines and black text in the cells. VGA vs DVI was as
    night vs day in clarity to me.

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    Frode, Apr 7, 2005
  9. DB

    DB Guest

    Thanks all you guys for your input. I think I'll try and find a less
    DVI cable and give it a go for myself.
    DB, Apr 7, 2005
  10. Yes, the DVI cable is better, the amount of the difference varies. It
    may be anything from minor to tremendous.

    That's an outrageous price for that cable. You can probalby find one
    for $15 or so.


    most monitors that have DVI inputs come with a DVI cable.
    Barry Watzman, Apr 7, 2005
  11. Well, his perfect record is then no longer intact, because he's right on
    this one.
    Barry Watzman, Apr 7, 2005
  12. Most of the people who don't see a difference don't know how to evaluate
    a monitor. I've been in the display business, and the difference to a
    trained eye is usually significant. Put up a test pattern of
    alternating black and white vertical bars, each one single pixel wide,
    and with an analog input there is usually some bad moire distortion
    present. Also, there is usually some "ghosting" or "ringing" around
    very sharp transitions -- like the vertical parts of white or black
    characters on a black or white background, when the character component
    is only a single pixel wide.

    Lots of people don't see these things, just like lots of people can't
    tell the difference between a $50 radio and a $2,000 stereo system. But
    if you show them to people, they will never again be happy with things
    that they used to be perfectly satisfied with. In any case, however,
    DVI images are totally free of these problems, so why fight it.

    By the way, a test program that will put up the bar display is available
    free. It can be used to correctly adjust the dot clock on an analog


    This program is variously known as CRTAT, CRTAT2, and CRT Align
    (crtalign), and was written by Stephen Jenkins in about 1992 or 1993.

    To use the program for this purpose, after installation, select the
    leftmost of the 3 functions in the "Test" group and then check both
    check-boxes. This is a very old Windows 3.1 program written in visual
    basic. It runs under XP just fine, absolutely perfectly in fact, even
    with today's high resolution monitors (you do need VBRUN300.DLL (the
    Visual basic version 3 runtime DLL library), which it may or may not
    come with it depending on where you download it from, but if you don't
    have VBRUN300.DLL, it can be easily found on the web).

    This program is totally non-invasive, it's "installation" makes NO
    changes to your registry or to ANY system components or files. In fact,
    if you just unzip the program and double click the exe file, it will run
    fine without actual "installation" (but the program and the help file
    need to be in the same directory, and VBRUN300.DLL needs to be available).

    When you display this pattern, you should see an absolutely perfect and
    uniform field of alternating (but very, very fine) black and white
    vertical bars each only one single pixel wide. If you see "moire"
    distortion, or smearing, your display isn't adjusted correctly. Digital
    monitors (with DVI interfaces) will always be "perfect". Analog
    monitors will usually show an initial moire distortion pattern until
    they are adjusted (dot clock frequency and phase). In most cases,
    perfect adjustment can be achieved (and is "remembered" by the display),
    but in some cases you can't achieve this. Note that the "auto"
    (auto-adjust) function on almost all analog LCD monitors gets "close"
    but usually does not get to the best possible adjustment.

    If you have an analog monitor and you don't use this program to adjust
    your monitor, you are doing yourself a real disservice.
    Barry Watzman, Apr 7, 2005
  13. DB

    J. Clarke Guest

    Which means that the timing is not properly adjusted.
    If the video board or cables are of poor quality.
    Or when they see them they fix them instead of assuming that they are
    insurmountable obstacles.
    Oh? I see mucho moire on my LCD connected via DVI if I don't have the
    timing right.
    J. Clarke, Apr 7, 2005
  14. DB

    J. Clarke Guest

    He's possibly right in some theoretical sense, but by no means in a
    practical sense. You may never have experienced a display that gives the
    same output when connected using DVI or analog cabling--if so you should
    broaden your experience.
    J. Clarke, Apr 7, 2005
  15. DB

    sbb78247 Guest


    That was the point i was making, in my case it was minor.

    sbb78247, Apr 7, 2005
  16. Re: "Which means that the timing is not properly adjusted."

    Dot clock frequency and/or phase. Right, exactly

    Re: "If the video board or cables are of poor quality."

    The cable is the usual culprit. First, they are often not of very good
    quality, but more to the point, many people have no choice but to use an
    extenstion cable. And, unfortunately, because price can be seen on the
    shelf, while quality can't, most of the cables sold are of poor quality.

    Re: "I see mucho moire on my LCD connected via DVI if I don't have the
    timing right."

    You and I are mostly on the same page, but not here. There is no timing
    adjustment or issue with a digital interface on any display that I have
    ever seen or used (and I was a display product manager for 7 years).
    DVI interfaces don't have to recover a dot clock to sample the pixels.
    The pixels are sent digitally and discreetly.
    Barry Watzman, Apr 7, 2005
  17. DB

    J. Clarke Guest

    And yet the moire remains.
    J. Clarke, Apr 8, 2005
  18. I got a Dell 24 inch 1920x1200 monitor. My AIW 9600 has two
    VGA outputs. No DVI. I was surprised to discover the picture
    was just fine. The dot registration is better than my glasses
    will allow :);

    I am still getting used to the corners being as sharp anywhere else.
    And 1920x1080 HDTV is awesome.

    This is with the VGA cable that came with the monitor.
    Chuck Forsberg, Apr 12, 2005
  19. DB

    DB Guest

    Ok, I thought I would share my results. I ended up getting a DVI cable for
    $17.50 from
    Cable makers inc. I notice that there is no longer any adjustments available
    for auto focus
    either on the Flat screen or via software. I guess because of the Digital
    signal. I think I
    can tell the difference especially in text. I think for $17.50 this was a
    purchase. Thanks again for all your input guys.

    DB, Apr 13, 2005
  20. There are not any adjustments because the digital signal is inherintly
    "perfect" in the aspects of things that you were previously adjusting.
    Barry Watzman, Apr 14, 2005
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