RE: X configuration for a 25Khz arcade monitor

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> I've played around with the modeline generator at
> http://xtiming.sourceforge.net/cgi-bin/xtiming.pl, but I haven't
> been able to come up with a modeline at exactly 25KHz. Simplest
> I could get away with was somewhere between 30 and 31KHz. I
> have my doubts whether you can run resolutions that high *cough*
> at a frequency that low.

I still have a question about this (a silly one because I don't
know much about technical details related to video frenquencies)

Why isn't it possible to run this resolution at a lower frequency
and why isn't possible to run a lower resolution (eg 256x224) at
a higher frequency (25Khz) ? Where is the limitation ?
In the graphics cards or is it simply the way frequencies should work ?
If the limitation is about graphic card, does exists some special cards
which allows to do such things ?

PS: sorry for these newbie questions, but I previously googled a lot on
this subject and found nothing, i'm deseperated :)
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