D-sub capability equal DVI in term of resolution?

Tseng

Senior member
Oct 9, 1999
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Just a question regarding the D-sub and DVI connector of modern video card.
If a video card's D-sub can output up to 1920x1440, does it mean that its DVI output
is capable of same resolution?

I could be wrong, but I saw lots of video crad's DVI output can only up to 1280x1024.

TIA
 

warmonger

Member
Feb 21, 2003
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AFAIK, the highest speed DVI on any current card is a 165mhz TMDS, which is DVI 1.0. This only gives 1920*1080 (HDTV) output at the max. DVI output of only 1280 seems a little low to me, but DVI cards don't necessarily have a 165mhz TMDS. 1280 needs only ~90mhz, so those cards with low maximum resolution must be using cheap DVI parts.
In short, no, the DVI output will not be 1920*1440. That would require 175mhz, which is not legal in the DVI spec.
 

Tseng

Senior member
Oct 9, 1999
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Several vendors have new 23" wide LCD on the market.
The best resolution is 1920x1200.
What kind of video card should these owners buy?
 

rbV5

Lifer
Dec 10, 2000
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If a video card's D-sub can output up to 1920x1440, does it mean that its DVI output
is capable of same resolution?
No, the maximum resolution on the VGA connector is determined by the speed of the RAMDAC, the DVI connector digital resolution is provided by the TMDS transmitter.

DVI can also use dual link TMDS for a maximum resolution up to 2048 x 1536.
 

warmonger

Member
Feb 21, 2003
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1920*1200 probably just uses the analog input.

And actually, you can get much higher than QXGA with a dual-link TMDS. The highest resolution I know of with dual-link is 3840*2400, on the IBM T221. Too bad that's at an almost unusable refresh rate, but for a monitor with over 200 ppi, it's worth it.
 

omv

Junior Member
Mar 14, 2003
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Originally posted by: Tseng
Several vendors have new 23" wide LCD on the market.
The best resolution is 1920x1200.
What kind of video card should these owners buy?

I believe all the 1920x1200 displays use single-link DVI. Apparently, you can squeze this out of a single-link DVI card by screwing with the video timing, but you might need something like powerstrip to do this. Hopefully they vendors ship an .inf file to make windows do the right thing.

So, any video card with a full DVI 1.0 port should work.
 

rbV5

Lifer
Dec 10, 2000
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So, any video card with a full DVI 1.0 port should work.

Thats not the case, its the implementation that counts. He is right in that several cards only support up to 1280x1024 via DVI...so you need to check to be sure.
 

Tseng

Senior member
Oct 9, 1999
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Got my Philips 200P3M and DVI-D calbe last night. My video card is ATi 8500LE.
Now I can confirm that 8500LE is capable of DVI-D output up to 1600x1200x32bpp@60Hz.