In alt.engineering.electrical krw wrote: | In article , snipped-for-privacy@ipal.net | says... |> In alt.engineering.electrical krw wrote: |> | In article , snipped-for-privacy@ipal.net |> | says... |> |> In alt.engineering.electrical krw wrote: |> |> | In article , snipped-for-privacy@ipal.net |> |> | says... |> |> |> What aspects of a DVI switch (KVM for example) would affect its ability to |> |> |> handle higher video modes such as 1920 x 1200 (when it can handle 1600 x 1200)? |> |> |> I'm curious why there are so many DVI switches that have a 1600 x 1200 limit |> |> |> and can't do 1920 x 1200. |> |> | |> |> | What refresh rate? Perhaps it needs Dual Link DVI (DVI-DL) to get |> |> | the refresh rate you're looking for at 1920x1200. |> |> |> |> 1920x1200 (WUXGA) is a single link format. Single link can go all the way up |> |> to 2098x1311 for odd formats. 2048x1152 (non-standard, but sensible) format |> |> would also be doable on single link. Dual link could go up to 2960x1850. |> | |> | At 60Hz, yes. By 85Hz single link is out of gas. That was my point |> | ("what refresh rate?"). Do follow along. |> |> I will push the refresh rate as low as I can make it work. | | ???
I don't need the refresh rate. I'm not doing fast action gaming. My use of computers is programming, building Linux pseudo-distros, and managing some web servers. While I would use 75 Hz refresh on a CRT to avoid flicker, I don't need to do that on LCD. I have no need to run it even as high as 60 Hz.
24 Hz would be fine by me if I could find a monitor that would accept it.
|> The lowest monitor |> found will go down to 48 Hz (from HP). If I stick to the literal WUXGA format, |> then it's 60 Hz. For the computers outputting the 1920x1200, the vertical rate |> isn't much of an issue. | | I don't think I'd care too much for 48Hz, though have never tried | it. My laptop/24" monitor combination is restricted to 60Hz (at | 1920x1200). I thought it was because this is a cheap monitor (which | I suppose is true - single link).
At 48 Hz, the DVI clock rate can go lower, compared to 60 Hz, for the same geometry (e.g. 1920x1200 on each). The clock rate for 1920x1200 at 60 Hz could do 2048x1280 at 52.75 Hz. Or it could do 2560x1600 at 33.75 Hz. You just need components (video driver, video card, KVM switch, monitor) that don't insist the video mode match one of the named VESA standard modes.
|> The analog computers will be outputting some lower |> resolution to be scaled up, and at the lowest refresh rate I can get (because |> that gives me some more resolution on those). | | "Analog computers"? "Scaled up"? I don't understand the entire | paragraph.
Sorry for the confusion.
By "analog computers" I meant "The two computers I have here that output their video in analog as RGB over a HD-15 connection" ... as opposed to the "digital computers" which are "the (other) two computers I (will) have here that output their video in digital as RGB over a DVI connection".
The computers that output video in analog won't be at 1920x1200. They may be at 1440x900. I'll live with the upscaling artifacts. They are currently running at 1200x960 into a 1280x1024 monitor. The catch is that the highest number of video lines I can program into them is 1023. That and I cannot find a newer video card that supports the software I use on those machines (maybe in the near future the ATI Radeon ones will have enough info released I could upgrade the software for).
Two new computers (one is built now, but I have not selected the video card to go to 1920x1200 for it, yet, so it's limping along as a server for now at a video geometry of 1152x864) will become my new primary graphical desktops. The intention is to go with 1920x1200 but I'm open to doing 2048x1280 or even
2560x1600 if I can find a monitor that will do it at a slow enough speed to do it over ONE DVI link channel. Some monitors will go down to 50 Hz or 48 Hz, so it's just a matter of finding one with 2048x1280.
BTW, that's another of my common rants ... monitors that have LOW frequency limits on vertical video frame rates that are higher than an existing standard video frame rate (e.g. 23.976 Hz). They just need to have a clock that can be adjusted to a lower rate and firmware that doesn't assume all video is at a higher rate.
Have a look at the tech specs on THIS monitor:
formatting link
It is intended for broadcast studio purposes, but can be used as a computer display (as can so many TVs out there). It does support 23.976 Hz in the
3xBNC component inputs. But it doesn't support 23.976 Hz in the HD15/VGA input. I don't see why it shouldn't, though. Apparently it can do the component in either YPbPr or RGB, so I'm curious how well it would do if I used a VGA to 3xBNC connector to feed the computer video that way.
I know that going FASTER is hard to do. It requires better clocks and faster digital circuits. It requires analog amps with a higher bandpass. But why is going _slower_ hard to do, too?