[lug] 2D cards

Tkil tkil at scrye.com
Fri Apr 28 16:32:22 MDT 2006

>>>>> "Zan" == Zan Lynx <zlynx at acm.org> writes:

Zan> And of course if you're using DVI to a LCD panel, none of that
Zan> matters.  Bits are bits.

Not entirely true.  Clean signal at the frequencies required to drive
multi-megapixel displays is non-trivial.

Think about it this way: the latest monitors are the 30" LCD
behemoths, which are at least 4MP.  Refreshing them with 24-bit data
at 60 frames per second yeilds

   4MB * 24bpp * 60 = 5.76 Gbps

That's non trivial.

Granted, its failure should be binary (it either works or it doesn't)
but it's possible that a sufficiently cheap card / PHY and cable could
lead to a DVI-D connection that glitches or has other transient issues.

This is also a part of length limitations on the cable (just as with
any digital signally protocol, there are physical effects that limit
how far the signal can go and still be usable).


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