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 ++++++++++++++++++++++++++++++++++++++++