2017-01-23, 16:29
(2017-01-23, 11:25)oo.viper.oo Wrote:(2017-01-20, 20:30)fritsch Wrote: With DVI -> HDMI there is only 3840x2160 @ 30p max.
Just for completeness for other guys reading this (I know you know fritsch :-)):
This particular Intel GPU has two video outputs (relevant for our case):
1. HDMI 1.4 output, which is connected to DVI port on the mainboard's backplate
2. DisplayPort 1.2 output, which is connected to on-board DisplayPort->HDMI 2.0 converter and output of this converter is connected to HDMI port on the mainboard's backplate
So one can connect DVI->HDMI cable to the DVI-out of this mainboard, because this DVI-out is actually HDMI-out. It's HDMI 1.4 though and consequently max. refresh of HDMI 1.4 at 4K resolution is 30p.
Therefore 4K@30p is not some general limitation of DVI->HDMI, but it is limitation of this particular mainboard, because of it's implementation of DVI port.
While this is true, DVI-D only supports a max of around 10Gb/s, which is much lower then the 18Gb/s of HDMI 2.0. The bandwidth limitation also prevents DVI from going above 4k 30Hz.