Well if it states 75Hz as it's specs, and reviews say 75Hz, and you have managed to set it to 75Hz natively without using any LCD overclocking tools, then it is indeed a 1080p 75Hz Freesync monitor
Wouldn't worry about someone on reddit trying to say otherwise, they don't sit in your chair and see what you see - possible they are getting mixed up with VGA vs HDMI for whichever Hz it supports at 1080p, no idea, but you seem to be correct in this case, even Amazon specs show 75Hz @ 1080p
So I guess that also means FreeSync range of 48-75 at 1080p 75Hz, just like the specs say? Some games are giving me trouble with FreeSync not working (screen tearing), but some others run just fine with it, or at least no screen-tearing. My first experience with FreeSync can't really tell it apart. Reddit people say it's only 48-60 not 48-75.
right click the game .exe .. properties.. compatibility tab.. uncheck full screen optimizations. try that
Go to the game menu and choose the nearby resolution to you´re native monitor resolution plus “Alt-space x” to run in full screen mode.
The limitations one has to deal with (what can be transmitted) is specified in the HDMI protocol whatever kind of monitor. The rest is chipwork. Or one uses another interface such as DVI or display port.
Hi Yen thanks for very good info related to website maybe I need "some relative time" to read all content but is valid