{ "numMessagesInTopic": 19, "nextInTime": 1630, "senderId": "5eqafUfPke2WXV5oj4muNZ1FG2VIczs-slqnTm5-LfxX1emSkkJNFMgh0dJNSDujVwJo7ajNt2rHOdNRyD-YwrifQJXXF1vRrSnOzCdEew", "systemMessage": false, "subject": "Re: Quadro NVS440 works - DG3 3840x2400 @ 41Hz!!", "from": ""fluppeteer" <yahoo@...>", "authorName": "fluppeteer", "msgSnippet": "Hi all. Sorry, been busy. I ve got a little to say to each of the posts, to there ll be a flurry - but I ll try to be brief. Sorry for the inbox traffic. ... ", "msgId": 1629, "profile": "fluppeteer", "topicId": 1622, "spamInfo": { "reason": "6", "isSpam": false }, "replyTo": "LIST", "userId": 192443393, "messageBody": "
--- In IBM_T2X_LCD@yahoogroups.com, "yeangchng" <yeang_chng@...> wrote:
\n>
\n> Hi all,
\n>
\n> If you remember, I suggested Nvidia's Quadro NVS 440 as a possible
\n> (cheap) solution to running DG3s/VP2290b's at 41Hz. I don't think
\n> there's been a report from any user running this card with a DG3
\n> yet - I got my NVS440 last week, and tried it this weekend.
\n
\nWell done, Yeang. Thanks for checking it out for us!
\n
\n> Works like a charm! Using all 4 single link DVI inputs of
\n> the DG3, all I had to do was to activate all the 4 displays
\n> in the Display Control Panel, and I had 3840x2400 @ 41Hz,
\n> albeit as 4 different displays.
\n
\nReassuring the bandwidth is up to it. Woohoo!
\n
\n> As I was using the consumer-level forceware driver, I did
\n> not have the Multi-view option, but I could link each pair
\n> of displays into 1 larger display using the Vertical Span
\n> option. this gave two displays in windows of 1920 x 2400
\n> each. I suspect I will have to install the Quadro level
\n> driver to get multiview working, which will combine all 4
\n> heads into 1 virtual display.
\n
\nUm. I could be wrong about this, but I don't think the
\ndrivers will do what you want. "MultiView" is nVidia's
\nterminology for "separate displays". The Quadro "SLI
\nMultiView" support, if it works at all for this card,
\nis (as I understand it) intended to present a single
\nOpenGL surface across multiple devices (much like SLI
\nnormally presents a single interface to two graphics
\ncards). To the best of my knowledge, it doesn't have an
\neffect on 2D at all. Windows (XP) needs to be able to
\nmemory map the frame buffer, and if the frame buffer
\nisn't in one place it's hard to do this (although not,
\nstrictly, impossible - the halves of the card could
\nmerge the data on a Lock() and redistribute on Unlock()).
\nVista, without a 2D frame buffer for the desktop (in
\nAero mode) might behave differently - but then we don't
\nhave multi-card DirectX support with multiple outputs
\neither (for some reason).
\n
\nI'm not sure that accelerated OpenGL on an nvs card
\nis terribly worthwhile, if it has any effect at all.
\nThey're not the FX range. :-)
\n
\nUpshot: the Quadro drivers might let you accelerate
\nOpenGL across all the heads, whereas otherwise only
\none pair of heads might be accelerated, but AFAIK
\nthat's all they'll do. You'll still have a split task
\nbar and windows maximizing to half the screen. If you
\ncan't actually span *all* the displays, there's nothing
\nyou can do; sounds like the nvs440 is two graphics chips
\non a card, like the FX4500X2 (only much smaller).
\n
\nSounds like the nvs440 is a good card for being able to
\nget the full refresh, and being able to be plugged in to
\na single-lane slot, but it doesn't look good for the
\nperfect display. I'd love to be wrong, though.
\n
\n> Regardless, 4 x 1920 x 1200 -> 3840 x 2400 @ 41Hz
\n> works like a charm out of the box with this card,
\n> which makes it a very easy solution without all the
\n> kinks of dual-link and 3-stripe modes.
\n
\nIt sounds like the equivalent of hooking up all four
\nheads of an SLI solution to the monitor - without the
\ngraphics performance, but also without taking up the
\nspace.
\n
\n> It might even
\n> an attractive solution for DG5 owners as getting 3-stripe mode to
\n> work with anything above the 77.xx drivers is DRIVING ME NUTS!!
\n
\nI've not tried it recently (on my "to do" list, along
\nwith a FAQ), but have you got the two halves going *not*
\nin horizontal span? Tried some custom timings? I'm
\nwondering what Windows actually lets you specify if it's
\noutside the range of that it thinks the monitor can
\nhandle. Perhaps some monitor drivers? The nearest I got
\nto perfect on a 6800GTo was the two heads running, but
\nnot spanned.
\n
\nIncidentally, has anyone tried 1920x2400x2 spanned with
\ntwo converter boxes on a modern consumer graphics card?
\nIf it works, I might think about shopping (although I'll
\nprobably still wait for a DX10 card).
\n
\n--
\nFluppeteer