On Sat, January 31, 2015 1:19 pm, John R Pierce wrote:
On 1/31/2015 10:34 AM, Valeri Galtsev wrote:
I see that single link DVI supports up to WQUXGA (3,840 × 2,400) @ 17 Hz (164 MHz) whereas dual link DVI supports up to WQUXGA (3,840 × 2,400) @ 33 Hz with GTF blanking (2 × 159 MHz)
those numbers seem wrong to me. nothing I've ever seen uses 17hz or 33hz refresh, its all pretty much 60Hz in LCD flat panel land.
single link DVI goes up to 1920x1200 in practice, and dual link up to 2560x1600. so-called '4K', really 3840x2160, requires DisplayPort, or HDMI 2.0 (1.4 supports 4K at 30Hz only).
there's actually something like 5 possible DVI combinations. DVI-D is digital only (no analog/VGA output). DVI-A is analog only (really just VGA with a different connector, I've never seen this in the real world). DVI-I is both analog and digital in parallel on the same connector. either of the digital formats can be single or dual link.
Not in a course of argument, but just to mention. The modes that I cited are from the DVI standard restrictions (basically driven by data troughput restriction) taken verbatrim from wikipedia:
https://en.wikipedia.org/wiki/Digital_Visual_Interface
I only took the mode with highest X*Y resolution hence having smallest refresh frequency. In the reference above all modes are listed including practical ones (with refresh rates 60 and 30 Hz).
I screwed up about one thing though: I called DVI-D "dual link" whereas DVI-D stands for "digital only" both single or dual link, there doesn't seem to be special designation for dual link...
As far as what particular card can/will support, it all depends on the chip it uses (and may also for the same chip depend on board design).
I hope, this clears it all. And my apologies if my original message caused any confusion.
Valeri
++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++