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can explain/confirm the Nvidia (?) dual DVI (at 1600x1200) issues?

P

phryguy

Member
I remember hearing about this in a discussion forum at work and I've found some anecdotal reports of problems
http://forums.2cpu.com/showthread.php?s...threadid=33992&perpage=30&pagenumber=5
http://www.nvnews.net/vbulletin/archive/index.php/t-34796.html

and some chatter at http://forums.anandtech.com/messageview...hreadid=1542454&enterthread=y&arctab=y (but the links in the posts are dead 🙁).

Can someone summarize what cards or chipsets are affected? Is this still a prob now? If it's a problem specific to Nvidia cards, is there something a card can have so that it won't have the prob? Are the symptoms being unable to run both 2 displays at 1600x1200 over DVI or screen corruption on one?

The reason why I'm asking is because I'm looking for a relatively cheap <$200 dual DVI out card w/perf similiar to the Geforce 6600 or ATI X700. I'm hoping that Dell will resurrect their deal for the BFG 6600GT OC 128MB PCI Express Video Card for $187 (has dual DVI) but if it can't run both displays at 1600x1200, it's pointless. I may as well get a 2nd video card w/DVI to run the 2nd LCD.

I'm also blown away that every review of the Powercolor X700 Bravo (ATI X700 based dual DVI out) doesn't even mention whether they tested this setup!
 
Well, as the extremetech article neatly explains and displays, your DVI transmitter needs to produce a signal of a certain strength, clarity and quality - else the signal won't be recognizable on the far end of the cable. That's digital life: It either works or doesn't.
 
The Quadro chips have the same problem. FireGL is fine, but so is something simpler from ATi like the dual-DVI 9600 that H.I.S. used to make.

Later NVidia drivers mask the problem by running a lower refresh frequency with highres DVI, thus staying below the threshold above which the signal quality degrades noticeably. You'll typically be at 140 MHz instead of 160 then, running the panel at 52 Hz instead of 60.
 
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