Samsung U28E590D Freesync range

I have been having a hard time trying to figure out the real Freesync range of this monitor, for like a month now. I'm on Windows 10 64bit, AMD 16.12.2 driver, with RX 480, and monitor driver installed. I also tested it under Windows 7 with old and new drivers, same results.

All of the reviews I have read before purchasing state that the range is 40-60 or at least 45-60.
AMD lists it having 40-60 range: AMD Official Freesync Monitors
A few others are reporting the same problem by the way.

What actually happens is, if I turn OFF Freesync in the monitor's OSD, I got the default maximum refresh rate of 60hz. With Freesync ON, maximum refresh rate becomes 64! And the FS range is actually 54-64! (Reported under Radeon Settings, and tested to be the case).

I tried many times to modify the range of Freesync using CRU, and everytime I do so and test it with games or AMD/Nvidia apps, the monitor will eventually turns white or green after a random amount of time (sometimes 10min, others up to 1 or 2 hours), What's interesting is that Freesync actually works in the range I specify (tried up to the 40-64 range).


Here's all the details that might be useful in diagnosis:

- Part of the manual that lists all of the panel specs (Keep in mind that FS is only working with Displayport):
U28E590D Manual


- Default timings and frequencies detected by CRU:





Is the Freesync range of this monitor really is 54-64?! Or am I doing something wrong?
Thanks in advance.