Re: Dual mode display port to DVD-D adapter?

Boris <[email protected]> wrote in
news:[email protected]: 

> Paul <[email protected]> wrote in news:[email protected]:
> 
>> On 9/13/2022 11:40 PM, Boris wrote:
>>> I received a Dell 8950, 12th gen i7, with a onboard graphics.  The 
> display
>>> port is:
>>> 
>>> Dual-Mode DisplayPort 1.4
>>> Connect an external display or a projector.
>>> NOTE: Besides a DisplayPort connector, this port can also provide 
> display
>>> output to a DVI or HDMI connector with a
>>> DisplayPort 1.4 adapter (sold separately).
>>> 
>>> None of the monitors I have hanging around have HDMI.  They do have 
> DVD-D.
>>> Is there such a thing as a dual mode display port to DVD-D adapter. 
>>> Is 
> so,
>>> can you recommend a decent one?
>>> 
>>> I don't do gaming or video editing.
>>> 
>>> TIA
>>> 
>> 
>> You have to check the details on the product, to make
>> sure it's the right one for the monitor. Many monitors
>> will be 1920x1080 @ 60Hz, and either adapter below would work.
>> An Apple Cinema monitor, one of the old ones, might require
>> the expensive adapter, as the Cinema monitor was dual link.
>> It's one DVI connector, but there are two "sets" of pins,
>> each one is termed to be a "link".
>> 
>> DP to DVI single link $20   [ 1920x1080 or 1920x1200 CRTRB ? ]
>> https://www.startech.com/en-us/audio-video-products/dp2dvi2
>> 
>> DP to DVI dual link  $163   [ 2560x1600 or higher ]
>> https://www.startech.com/en-us/audio-video-products/dp2dvid2
>> 
>> I've put a notation next to the "most taxing" display mode.
>> Displaying at 30Hz or even 24Hz, is OK for movie night, but
>> not so good for normal monitor usage. That's why 60Hz is
>> a better metric, than pretending that 24Hz is impressive or something.
>> The DVI clock interface cannot go over 165MHz. On the cable
>> this is multiplied by 10, and is actually 1650MHz. You can
>> see the 2560x1600 @ 60Hz, the adapter is "loafing along" at
>> only 135MHz.
>> 
>> https://en.wikipedia.org/wiki/Digital_Visual_Interface
>> 
>>     "Example display modes (single link):
>> 
>>      SXGA (1280 × 1024) @ 85 Hz with GTF blanking (159 MHz)
>>      HDTV (1920 × 1080) @ 60 Hz with CVT-RB blanking (139 MHz)
>>      UXGA (1600 × 1200) @ 60 Hz with GTF blanking (161 MHz)
>> 
>>      WUXGA (1920 × 1200) @ 60 Hz with CVT-RB blanking (154 MHz)  
> 154<165max
>> 
>>      WQXGA (2560 × 1600) @ 30 Hz with CVT-RB blanking (132 MHz)
>> 
>>      Example display modes (dual link):
>> 
>>      QXGA (2048 × 1536) @ 72 Hz with CVT blanking (2 × 163 MHz)
>>      HDTV (1920 × 1080) @ 144 Hz[6]
>>      WUXGA (1920 × 1200) @ 120 Hz with CVT-RB blanking (2 × 154 
> MHz)
>> 
>>      WQXGA (2560 × 1600) @ 60 Hz with CVT-RB blanking (2 × 135 
> MHz)  135<165max
>> 
>>      WQUXGA (3840 × 2400) @ 30 Hz with CVT-RB blanking (2 × 146 
> MHz)
>>     "
>> 
>> DVI single link, half the digital pins are working at the time.
>> DVI dual link, all the digital pins are working, to achieve the
>> higher resolution. And this is due to the DVI spec being moribund
>> and stopping at 165MHz. When clock rates have been climbing since
>> then (for HDMI and DP) and allowing much higher resolutions. There
>> is less interest (apparently), in making dual link DVI items. Maybe
>> it took two adapter chips rather than just one. You never know.
>> Some of these chips are re-purposed adapter chips used in TV sets
>> (on the TV set IO board). That is why some of them are so cheap.
>> 
>>     Paul
>> 
>> 
> 
> Thanks for the reply.
> 
> The connector looks like a DVI-I dual link connector, with it's 3x8
> block of pinouts and the other four pinouts.  Can I assume that a dual
> link DVI- I connector is used on all StarTech's display port converter
> cables, but not all pins are wired, depending on it's intended use?  Or
> is the picture incorrect?
> 
> (You may notice that I'm posting on aioe.org, instead of E-S.  For some 
> unknown reason, to me, E-S gave me a 441: Excessive nymshifting.  I
> rarely post, but read a lot.  I've probably posted three times in the
> last week.  I did read on Narkive that there was a discussion of E-S
> probably turning on nymshifting discipline measures about a month ago.)
> 

Odd.  I notice that E-S picked up this post, but I still can't post
directly to E-S.  Due to different injection point?