Confusion with screen resolution

[naokuronao]

Hello, I went through 2 websites where it identifies your display resolution. It identified my screen resolution as 2560 by 1440. I got confused by this because I own an Acer XB280HK which has an maximum resolution of 3840 by 2160. I checked my display settings and it is using that current resolution. I'm wondering why the websites resulted in a lower resolution. 

 

These are the two websites I checked from:

http://www.screenresolution.org/

http://whatismyresolution.com/

[Aytex]

What display adapter are you using?

Try going into your graphics card's settings to scale up the rez like amd's crimson or geforce experience

[Naeaes]

5 minutes ago, naokuronao said:

Hello, I went through 2 websites where it identifies your display resolution. It identified my screen resolution as 2560 by 1440. I got confused by this because I own an Acer XB280HK which has an maximum resolution of 3840 by 2160. I checked my display settings and it is using that current resolution. I'm wondering why the websites resulted in a lower resolution. 

 

These are the two websites I checked from:

http://www.screenresolution.org/

http://whatismyresolution.com/

Maybe the browser is tricking the site for some reason. Did you try other browsers?

[l_zheng101]

The monitor you are using features G-Sync but you have a AMD graphics card which might be a problem. 

[naokuronao]

54 minutes ago, Aytex said:

What display adapter are you using?

Try going into your graphics card's settings to scale up the rez like amd's crimson or geforce experience

I'm using nvidia GTX980Ti

I did went to the aspect ratio in the nvidia control and it did say 3840 by 2160.

When I launch games, such as Rocket League or GTA, it does scale as UHD.

[naokuronao]

58 minutes ago, Naeaes said:

Maybe the browser is tricking the site for some reason. Did you try other browsers?

I tried with Microsoft edge and it resulted in the same problem.

[naokuronao]

42 minutes ago, l_zheng101 said:

The monitor you are using features G-Sync but you have a AMD graphics card which might be a problem. 

That's kind of the reason why I got this monitor, since I use an nvidia 980Ti 

[vanished]

I've heard webpage resolution checkers can be unreliable.  Since it's a 4K screen, are you by any chance using scaling above 100%?  I've heard that can affect the site.

[naokuronao]

29 minutes ago, Ryan_Vickers said:

I've heard webpage resolution checkers can be unreliable.  Since it's a 4K screen, are you by any chance using scaling above 100%?  I've heard that can affect the site.

Yeah, the windows automatically sets the scaling at 150% for default in 4k. I just did what you said and now it actually shows up the maximum resolution for my monitor! Thank you for the clarification!