Custom Resolution Utility (CRU)

[aliquis]

Hello, first of all i am new to this forum but i have already used CRU often, the tool was very helpful so i greatly appreciate the work you put in.

I have a question (although my problem is already solved, i don't understand something) which i hope someone may shed some light upon.

I own a samsung cf791 monitor (21:9, 3440 x 1440 , 100hz, VA, that supports freesync). There is a wide reported issue (it seems 100% of users have this problem) that the monitor starts to flicker when freesync is turned on (more so if the framerates are low (roughly lower then 60fps, and therefore the monitor is running at lower hz because of freesync)
The freesync range used is 48-100hz. It works (tested with games and techdemos like gsync demo) and LFC also works.

Now i have read a lot, exchanged opinions and experiences with other users and tried a lot, and it seems at least so far i have found and fixed the problem, or at least the problem has disappeared: Someone posted that the pixel clock and h rate was wrong:

please correct me if i am wrong but as far as i read it pixel clock = v total * h total * refresh rate but when i openened cru and looked at the settings for the cf791 the pixel clock rate was too fast (it was set to 550 mhz and the h rate was too fast too)
but if we take the formula: 3600 * 1481 * 100 = 533, 160 mhz (lower then the pixel clock rate that was set) and the standard h rate was too high too ( i corrected it to the correct one)

After i did these corrections the flicker in freesync disappeared, now my question is were these standard settings really wrong and is it likely that these slightly too high pixel clock and h rate caused this flicker ?, and if so, how can it be that wrong values/settings are used for this monitor and whose fault is this (the radeon driver or samsung firmware)?

This is a short video i uploaded on youtube that shows the flicker that happened before i changed the pixel clock and h rate values, it is a short video of ROTTR running on 3440 * 1440p on a rx 480 with freesync enabled, although it was recorded only with a 30 fps camera, the flickering that one can see in the video is about what you see with your eyes if you sit in front of it
cf791 flicker
After changed the values this flicker is completly gone ( and freesync is still working)