Why can't I get refresh rates higher than 60Hz on my 100Hz monitor?

[r6mile]

Hello - I am using a 2018 Mac Mini, and have a Viewsonic 27" 2K monitor (https://www.viewsonic.com/global/products/lcd/VG2755-2K) that supposedly supports refresh rates of up to 100Hz. But I can't seem to get it to show any refresh rates higher than 60Hz?

I am using a brand new Benfei USB-C to DisplayPort cable that supports much higher resolutions and refresh rates. But the Mac OS Display settings don't give me the option of anything higher than 60Hz at 1440p. I have also tried SwitchResX, I set a refresh rate of 100Hz but it said it was "invalid" (it's also possible I used SwitchResX wrong as I haven't used it before).

Does anyone have any advice?

 

[Bigwaff]

Does anyone have any advice?

Might be setting in display onboard controls. Look for something called timing or refresh.

 

[r6mile]

Thanks for your response - I looked a bit deeper into the technical documentation and it turns out the Viewsonic promo page is incorrect, and the actual manual says the display only supports 60Hz.

 

[TumbleDryer]

Thanks for your response - I looked a bit deeper into the technical documentation and it turns out the Viewsonic promo page is incorrect, and the actual manual says the display only supports 60Hz.

Could maybe try and get a part refund for being mis sold.

 

[r6mile]

I am pretty sure the description on the website where I bought this from said 60Hz (I just looked at my e-mails), and it was 5 years ago anyway Was not an issue as I was using a 2012 Mac Mini which doesn't support higher anyway, but now I'm on a 2018 so started looking into it.