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hdmi vs dvi vs vga - Page 2

post #11 of 22
the one big advantage of using vga is it supports power saving mode. when the pc sleeps, the monitor sleeps with it. not sure if hdmi has caught on.
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post #12 of 22
My laptop can switch my TV off though HDMI so I think it has.
    
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post #13 of 22
Depends on what DVI connectors you're talking about.

DVI-A for example is an analog connector, though seldom seen in desktop circles.

Note, HDMI can't do 120Hz higher than 1200p IIRC
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post #14 of 22
Quote:
Originally Posted by sanket779292 View Post
that means in DVI the picture is constant and in VGA picture or the text is flickering, is it
Yes. My friend said something vague about VGA sending a whole picture while DVI sends individual pixels, something like that. Sounded like hogwash.
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post #15 of 22
Quote:
Originally Posted by Skripka View Post
Note, HDMI can't do 120Hz higher than 1200p IIRC
Yeah I had to figure that out when my 1.3 HDMI cable wouldn't do triple monitor resolutions. Thankfully they had 1.4 in stock at the time.
post #16 of 22
Quote:
Originally Posted by rdr09 View Post
the one big advantage of using vga is it supports power saving mode. when the pc sleeps, the monitor sleeps with it. not sure if hdmi has caught on.
Most monitors (and even TV's) either sleep or switch off when they loose the input signal (ie my 2 Benq LCDs and my viewsonic go into "sleep" mode when the pc turns off/goes to sleep, my LCD TV turns right off (standby mode) when my HTPC turns off/sleeps/turns the monitor off)

My understanding of the whole thing is essentially

DVI/HDMI/(and displayport?) are the same in picture quality.
DVI sends video only
HDMI sends video and audio (with the same audio quality as optical and support for more channels so it doesn't need to be decoded at the reciever end)

VGA is Analog, which means the signal has to be converted from Digital to Analog, sent through the cable, then converted back by the screen (unless you have an Analog monitor, like a CRT), which induces the possibility of picture quality loss during the conversions.

Some screens you pretty much can't tell the difference between Analog and Digital signals, other screens its is blatently obvious (ie hard to tell on my Benq's between the 2, but on my viewsonic, the picture tend to be a little bland (colour wise) and ever so slightly blurry (really noticeable on text).

And as far as i know, picture quality difference is hard to pick between the 2 in movies and such.

(ps, i think with the latest version of HDMI they added some deep colour thing for better colour reproduction, mainly for 3DTV and such)
Edited by ShadoX - 10/23/11 at 6:03am
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post #17 of 22
Quote:
Originally Posted by ShadoX View Post
HDMI sends video and audio (with the same audio quality as optical and support for more channels so it doesn't need to be decoded at the receiver end)
Thats debatable. I went from Optical on my Yamaha Receiver to HDMI and noticed a difference in quality.
post #18 of 22
There is actually (in some cases) a little more to it. A lot depends (mostly) on the monitor.

As most have said, VGA is analog. The video processor (graphic card/integrated graphics) converts the digital information it has been working with, to an analog signal before sending it out through the cable, it also will scale the picture to the resolution you have selected in your display resolution config. When this analog signal reaches your flat panel monitor (not CRT), the signal is then reconverted back to digital, and the individual pixels sent to the display panel itself. With LCD panels, this means the signal has been converted (and usually scaled) twice. D>A in the computer, and A>D in the monitor. This uaually cases a loss of PQ that will show in many cases, but may not on some lower end monitors.

DVI and HDMI are both digital signals, but this is where in many cases, the results get fuzzy.

DVI was initially designed as a computer interface (the replacement for VGA). DVI comes in a couple different forms [DVI-D (Digital), DVI-A (Analog)]. DVI-A is not very different from VGA, it is just a different cable. DVI-D (the current DVI "standard") is a digital video interface that allows the monitor to natively display exactly the signal it has received from the computer.

HDMI can still get a little hairy. HDMI was developed as a one cable solution for home theater (not initially computers). This is where in some cases problems can occur when connected to a computer's graphics card. Although HDMI carries the same video signal as DVI, some monitors manufacturers insist that the signal be run through a video process/scaler in their monitors.

This is to ensure that a video signal such as 720p (a television type signal), is scaled to the monitor's native resolution. Some manufacturers implement this to a fault, and even a computer's 1920x1080@60Htz signal is reprocessed to 1080p. Don't necessarily believe that your video signal isn't being touched before being displayed just because you are connected with HDMI.

Going back just a few years, this was a big problem with HDMI and computers. Manufacturers have been slow to adapt to the fact that many LCD monitors sold as TVs are used for computer applications. Currently, if you have a monitor that was sold as a computer monitor, in most cases, the HDMI signal is untouched by a processor/scaler in the monitor. It is just the opposite if your monitor was sold as a television that contains a tuner. HDMI in practically all cases of these "TVs" is re-processed (for no reason) in the monitor before being displayed when a signal is input through the HDMI connection.

This is why the graphic card companies have added the needed tweaks in their driver software to overcome the cases where scaleing appears to be off, you can't fill the entire screen of your monitor, or you need to deal with, and eliminate overscan. These problems are caused by the scaler in the monitor, and indicate unneccessary video processing.

Anyway I digress... HDMI can handle bandwith up to 10.2Gb/s HDMI also has the ability to carry uncompressed 7.1 channel PCM audio at up to 192kHz. It can also handle compressed lossless audio streams such as DTS Master Audio, and Dolby TrueHD. No other single audio connection is capable of carrying the latter two audio streams.
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post #19 of 22
Quote:
Originally Posted by fluxlite View Post
With dvi and hdmi, it's digital all the way from your card to the monitor, nothing is recalculated. The luminence and colour of each pixel is sent directly from the card and is directly interpreted and represented by the display.

DVI and HDMI, along with displayport, are the best way to connect your panels at the moment. There are absolutely no discernable quality differences between the three. HDMI also carries audio information, but unless you're outputting to a TV or decoder, it's a moot point.

With a dsub (VGA) connection the digital from the card has to be converted to RGB (of which each colour has 256 possible levels). Basically, it's possible that some of the colour accuracy is scrubbed in this process, and it introduces latency (although I don't think it's measurable...).
This.

Go for DVI / HDMI / Display Port if your monitor can natively support them.
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post #20 of 22
Honestly I could see a difference on my old monitor between VGA and DVI. There was always a slight fuzziness to the VGA connection and small horizontal/vertical/diagonal lines always sort of vibrated. That didn't happen on the DVI connection though. Maybe I had a crap monitor though
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