I had managed to get my monitor up to 85Hz before it said 'Out of range' when trying 90Hz, this is coming from the 75Hz recommended factory refresh rate. I see virtually no differnece in 75Hz vs 85Hz but that's probably because I have granny reaction speed.

The jump from 60Hz to 75Hz was more potent than 75Hz to 85Hz. The display doesn't seem to get damaged or have noticeable artifacting with 85Hz which is nice. Despite being a 5ms response rate monitor, there's very little blurring/ghosting, and my input still feel sharp, as it should since it should feel inperceivable.

Here's some Counter-Strike gameplay in a 25FPS GIF slowed down to 0.5x to show how slow my reaction speed is, and how unnecessary high refresh rates would be for an absolute slowpoke like me. Crosshair placement on point though.