{ "numMessagesInTopic": 15, "nextInTime": 320, "senderId": "z_AsdOzKE01KbtHLRxZXGEx0TTxtIJqpPlBWTLYzKG4e4PJ696dOM_77T_knpb1cn4m6Hj5tsWCNChGKcauiArExTLRcw3N1G9F8", "systemMessage": false, "subject": "Dual DVI misconception", "from": ""yeangchng" <yeang_chng@...>", "authorName": "yeangchng", "msgSnippet": "Steve/David, Thanks for weighing in on this. I must have sounded pretty silly, but all of my reasoning was based on one bad assumption, i.e. Dual- link isn t", "msgId": 319, "profile": "yeangchng", "topicId": 311, "spamInfo": { "reason": "0", "isSpam": false }, "replyTo": "LIST", "userId": 39184597, "messageBody": "
--- In IBM_T2X_LCD@yahoogroups.com, "sax00axe" <wrightsl@u...> wrote:
\n> Yeang,
\n>
\n> What are you saying about using 2x dual-link DVI cards? How many
\n> monitors now support one dual-link DVI channel, not to mention
\ntwo?
\n> I believe the IBM T210 was the first monitor to support dual-link,
\n> even before dual-link cards appeared on the market. The T210
\n> disappeared a long time ago, in my opinion at least partly due to
\nthe
\n> lack of experience and committment to good digital drive solutions-
\n
\n> customers must have turn-key solutions. Dual-link is in infancy.
\n>
\n> I don't fully understand your comments about Quadro FX4000 and
\ndual-
\n> link.... The DG3 does NOT support dual-link DVI, period. The DG5
\n> supports only one dual-link DVI channel, via the converter box. If
\n> and when 2x dual-link DVI cards appear, then there will be an
\n> opportunity for improvements. The converter box does exactly what
\nit
\n> was designed to do to support DG5- it just separates the odd and
\neven
\n> pixel data into two streams. The DG5 senses the presence of the
\n> converter box and reconfigures itself to convert the odd/even
\npixel
\n> data into left/right pixel data, or if three channels are used
\n(from
\n> FX4000),into a special 3-stripe configuration.
\n>
\n> You can drive DG3 at 25 Hz using cards with 2 single-link DVI
\n> channels, possibly 30 Hz or higher, depending upon signal/noise
\nratio
\n> of the transmitter chip. There are some multihead cards with 4
\nDVI
\n> channels that can be used to drive T221 in Quad tile mode at 41 Hz
\n> (DG3) or 48 Hz (DG5). Of course, these cards have very little
\nvideo
\n> memory and little or no graphics acceleration. There are
\nuniversity
\n> people in high-end visualization trying to use 4 DVI channels from
\n> genlocked sources from multiple computers...
\n>
\n> Driving 9Mpix is really pushing the envelope... often a CAVE
\n> visualization installation or planetarium involving massive banks
\nof
\n> projectors and computers doesn't do much more than this. There is
\na
\n> move to establish a standard for digital cinema in the range
\n> 3840x2400 (basically 4x HDTV) but this would not have a
\nsubstantial
\n> impact for many years. Although the price of LCDs is due for a
\nlarge
\n> drop later this year, I don't think this will spread far toward
\nhigh-
\n> end LCDs, with the possible exception of 1920x1080 TVs. Until such
\n> time as applications and OS provide full support for high density
\n> pixels, there will be no widespread movement toward higher
\n> resolution. Today, T221s can be used either for static
\napplications
\n> like digital photography OR for specifically-targeted workstation
\n> applications, using high-end cards such as FX4000, in an
\nindustrial
\n> environment with the associated support. The 16:10 aspect ratio
\nseems
\n> to be gaining momentum, but at low resolutions, with the Apple
\niMac
\n> G5 having 17" 99ppi 1440x900 and 20" 99ppi 1680x1050. It is only
\n> when people compare static images side-by-side at 100ppi and
\n200ppi,
\n> that they can visualize the difference.
\n>
\n>
\n> --- In IBM_T2X_LCD@yahoogroups.com, "yeangchng" <yeang_chng@h...>
\n> wrote:
\n> > Wilson, I haven't gone out and found a local place with a 6800GT
\n> > with dual DVI outputs yet -- Best Buy has a GT but it's single
\nDVI
\n> > only. Most online places want to charge 25-30% restock for a
\nreturn
\n> > on a 6800GT class card! I want to know the answer as much as you
\ndo.
\n> >
\n> > If I were going to try a card, I'd try the Gainward 2400
\n(6800GT)
\n> > Powerpack -- Gainward is probably better than other
\nmanufacturers
\n> > about including everything that can be included. I'm not sure if
\n> the
\n> > Ultras will have a better chance at having 2 SiI transmitters
\n> > instead of one.
\n> >
\n> > Questions regarding Dual DVI cards like the Quadro 4000/4400:
\n> >
\n> > What monitors do people generally use with these 2x Duallink DVI
\n> > cards? Both DG3 and DG5 are unusable (at the moment) with a 2x
\n> > Duallink DVI card, right? I assume so as from reading previous
\n> posts
\n> > it seems impossible to decimate the even and odd pixel streams
\nin a
\n> > duallink DVI connection into 2x single links. Therefore, as a
\nDG5
\n> > needs 1 Duallink and 1 Singlelink DVI connection, a Quadro
\n> 4000/4400
\n> > can't drive it.
\n> > So what do people use with their Quadro 4000's?
\n> >
\n> > In addition, this would also mean that DG3 owners like myself
\nwould
\n> > find any of the Dual-link + Single link DVI cards useless for
\n> > anything other than 13Hz operation from the one single-link DVI
\n> > connector? This is quite disturbing as it means that the only
\nPCI-
\n> > Express Quadros that I can use to drive my DG3 at >20Hz are the
\n> 1300
\n> > and 1400, both of which have 2x single link DVI outputs.
\n> >
\n> > Hopefully someone somewhere will come out with a cheap and
\nreliable
\n> > electronic convertor for Duallink to 2x single link streams.
\nDoes
\n> > anyone know of any such box, aside from the IBM convertor which
\nas
\n> > discussed in past posts doesn't actually do very much?
\n> >
\n> > Let me know if I'm mistaken.
\n> >
\n> > Yeang