Agree.tonyw wrote:It certainly looks like a bandwidth limitation to me.
I can add that I also have a similar horizontal frequency, 98.76 kHz. I'm using 2560×1600×32@60 on a Dell U3011 monitor. My X1000 has a Radeon HD 6670, and my X5000 uses a Radeon RX 560. Both are connected with DVI DL cables into an ATEN CS1784a KVM, which is also DL specced, and of course with a DVI DL cable from that to the monitor.I notice that your H freq is very high - nearly 100 kHz. With 2560 pixels across the screen, that needs a bandwidth greater than (2560 x 100 k =) 256 MHz. That is pushing the bounds of the adaptor and cable, not to mention the specification of the DVI interface. Perhaps you need to attract Hans' attention.
And I don't have any of those distortions. I did have them back when I tried using regular DVI (non-DL) gear with that resolution.
Of course there may be an actual hardware fault with one or the other component in Quaros' setup, but otherwise I would suspect the DVI to HDMI adapter or some other issue around the HDMI part of the chain (since that is where the setup differs the most from mine).