[kiaspectra]

Hi All,

Thread title pretty much sums up my question..... was wondering what the capabilities of DL-DVI and whether they can drive a 1440p display at 144 Hz (or at least 100+Hz??)

Somehow, googling around for this answer is very difficult to find solid information...

I've got an MSI R9 390 Gaming 8G with 1x DP, 2x DL-DVI and 1x HDMI and am already using a 1440p 144 Hz monitor via DP. I'm asking in hopes of being able to run a couple more 1440p @ 144 Hz monitors in the future

Any information would be appreciated!

 

[IMI4tth3w]

i know for a fact that the dual link dvi can run the korean 1440p monitors at 120Hz.

 

[CynicalUnicorn]

I think you'll need DisplayPort at the minimum. Dual-link DVI runs at 165MHz and spits out two pixels per cycle. Or in other words, it spits out 330MP per second, and at 144Hz, up to 2.3MP per frame. That's a little more than half what you'll need for 1440p's 3.7MP resolution.

If you can figure out how to overclock the DVI link itself though...

But that seems impractical, and the group behind DVI hasn't existed for years. DP on the other hand is open, current, and actively supported and updated, so try to get a monitor with that.

EDIT: And since you're interested in high frequencies in general, DVI can handle 1440p at 90Hz at its maximum 165MHz clockrate. A decent boost over 60Hz, of course, but not as high as you'd like. I suppose you could restrict the color depth to 6-bit rather than 8-bit, but that seems silly. You'll either have dithering (which doesn't look great) or banding (which looks even worse).

 

[Falkentyne]

1440p at 100hz can be done by bypassing the pixel clock limits by the ToastyX DVI pixel clock patcher (AMD/Nvidia).
120hz depends purely on if the physical monitor hardware can handle it. That's purely on a case by case basis, but you may wind up with corruption or swimming pixels when reaching this limit at 1440p, and this can vary between two of the exact same monitors. Some Korean QX2414 panels have been pushed to 240hz refresh rate over DVI and a 500mhz pixel clock but that's at 1080p.

144hz over DVI at 2560x1440 is completely impossible even at reduced blanking intervals. No hardware can handle those ranges over DVI. The TDMS chips can't handle those frequencies even if the pixel clock is only around 580 mhz. That much I can bet more than a kidney and a lung on.

 

[kiaspectra]

Thanks for the replies guys, very informative. *sigh* wish I had thought about this problem when making a graphics card purchase. then I would have gotten a card with 3 displayports and less DVI..

But, guess im stuck with lower frequency operation if i want my side monitors to be at 1440p until my next gfx upgrade....

 

[CynicalUnicorn]

If you had Nvidia and SLI, I'd say stick a couple monitors on the second GPU. Sadly, AMD's crossfire only allows display outputs on the primary card if my experience (~2014) is anything to go by.

Multiple GPUs are pretty poorly supported as it is unless you play AAA titles exclusively, so it's an exepensive fix and not even a good one.