Clarity needed - DP / DVI-D 1080@144hz

[KieranValmont]

Hi all you (hopefully helpful) people!

I have been looking online to find out what kind of connection I'd need to run a Iiyama G-MASTER Red Eagle GB2788HS 27" Gamer, 144hz LCD from a GeForce GTX 1080 at 1920x1080 and 144hz

One site says DP or DVI-D... another says only certain DP... another says DVI-D only...

HELP?!

 

[Rookie_MIB]

I daresay that if a Displayport can do 4k@60, it should be able to easily handle the bandwidth for 1080p@144. Do the math:

3840x2160 = 8,200,000 pixels * 60 (hertz) = 500,000,000 pixels per second.

1920x1080 = 2,000,000 pixels * 144 (hertz) = 300,000,00 pixels per second.

So - the bandwidth required to run 1080p@144hz is less than 4k@60hz. The question of course is will your card be able to process frames at that rate with the game you want to play...

As for DVI- I'm not sure what the max framerate per resolution is. I know that it can generally handle (in single link mode) something along the lines of 1080p@60ish hertz or so , dual link is like 2500x1200@60hz. Neither of them (single or dual) offer the bandwidth for 1080p@144hz.

If you had HDMI 2.0 - that could do 1080p@144hz since it offers enough bandwidth for 4k@60, but remember that HDMI 1.4 does NOT. It is -close-, but it only supports 4k@24 which is about half the bandwidth of 4k@60. And remembering our math (300mil pixels for 1080p@144, 500mil pixels for 4k@60) cutting the available bandwidth by half means 4k@24hz is less than 250mil pixels.

So - to recap: DVI-D cannot handle 1080p @ 144hz. Dual link DVI-D cannot handle 1080p @144hz. Displayport CAN handle 1080p@144hz. HDMI 1.4 cannot handle 1080p@144hz, while HDMI 2.0 CAN handle it.