Custom Resolution Utility (CRU)

[kaftul]

So, I tried CRU for the first time last night to try an see if I can run my monitor @75 Hz at its native resolution. The monitor is Acer G247HYLbmidx which support 75 Hz natively at low resolutions.

Initially I managed to easily force 65 and 70 Hz on the monitor with the LCD-standard profile and at same time keep my AMD card at default idle clocks. Then I tried 75 Hz and noticed that the colors become completely distorted at 75 Hz and anything above that would result in out of range message from the monitor. After playing around with different refresh rates, I noticed that with any setting that would need a pixel clock of above 165 MHz, I get color distortion, even though I am using DVI and the limit should be 330 MHz. After checking my cable, I noticed that the cable that was shipped with my monitor is actually single-link, so, I bought a dual-link cable right away, hoping that I would be able to successfully use pixel clocks above 165 MHz but I was wrong, I still got color distortion with anything above 165 MHz. I also tried patching my driver once but after patching, anything above 165 MHz would result in out of range message form the monitor instead of the color distortion, so I reverted the patch. Does this mean that my monitor, even though its DVI port physically has all the dual-link pins, is actually only capable of processing single-link signals?

I also managed to reach 72 Hz with a pixel clock of less than 165 Hz while keeping the vertical total the same as the standard profile to keep my card at correct idle clocks but with 75 Hz, if I use the reduced profile to have a pixel clock of less than 165 MHz, my card will not go down to idle clocks anymore and if I keep the vertical total the same as the standard profile for correct idle clocks, I cannot bring the horizontal total low enough for the pixel clock to be lower than 165 MHz. Is there any way I can get 75 Hz with correct idle clocks for my GPU?

P.S. CRU reads the maximum pixel clock of my monitor as 170 Hz but I am not sure if that means what I think it does.