Question My 240Hz monitor is stuck at 120hz

[samuel.pipolo26]

I have a 240hz Monitor (Alienware 25 Gaming Monitor - AW2518H) but it only uses 120hz in game. I went into the Nvidia Cntrol Panel made a custom resolution (1920x1080 240hz) and selected it and turned vsync off. I go into the windows display and it says my resolution and refresh rate (as it should says 1920x1080 and 240hz) but when I go into the Display --> Advanced Display settings --> Display adapter Properties --> Monitor. It says 240hz is selected (normal) but when I check the box that says Hide modes this monitor cannot display it goes back down to 120hz. I would like some advice on why this is happening.

Specs:
Nvidia Geforce Gtx 1089
i7 7700k Intel Processor
16 gigs of ram
Windows 10
Alienware 25 Gaming Monitor - AW2518H (240hz 1920x1080)

If any more information is needed I am happy to reply/supply it I would really like some help with this

 

[cdrkf]

I have a 240hz Monitor (Alienware 25 Gaming Monitor - AW2518H) but it only uses 120hz in game. I went into the Nvidia Cntrol Panel made a custom resolution (1920x1080 240hz) and selected it and turned vsync off. I go into the windows display and it says my resolution and refresh rate (as it should says 1920x1080 and 240hz) but when I go into the Display --> Advanced Display settings --> Display adapter Properties --> Monitor. It says 240hz is selected (normal) but when I check the box that says Hide modes this monitor cannot display it goes back down to 120hz. I would like some advice on why this is happening.

Specs:
Nvidia Geforce Gtx 1089
i7 7700k Intel Processor
16 gigs of ram
Windows 10
Alienware 25 Gaming Monitor - AW2518H (240hz 1920x1080)

If any more information is needed I am happy to reply/supply it I would really like some help with this

What cable are you using, HDMI or DP? I think for both G-Sync support, and to go over 120hz you have to use the DP cable (however the monitor comes supplied with an HDMI cable according to Dell's website)...

 

[samuel.pipolo26]

What cable are you using, HDMI or DP? I think for both G-Sync support, and to go over 120hz you have to use the DP cable (however the monitor comes supplied with an HDMI cable according to Dell's website)...

It came with an HDMI 2 cable which should be able to run 240hz at 1080p. I found that info in this article (was making sure) "HDMI 2.0 allows for 1440p at 144Hz and 1080p at 240Hz " https://www.gamingscan.com/hdmi-vs-displayport-vs-dvi-vs-vga/

 

[SgtScream]

I've read multiple forum threads that using a displayport cable solved the problem. Yes I know the one that comes with the panel should work, but it's worth a try.

 

[samuel.pipolo26]

I've read multiple forum threads that using a displayport cable solved the problem. Yes I know the one that comes with the panel should work, but it's worth a try.

alright thanks for the reply Im going to order one now and give feedback when it comes to see if it works!

 

[cdrkf]

It came with an HDMI 2 cable which should be able to run 240hz at 1080p. I found that info in this article (was making sure) "HDMI 2.0 allows for 1440p at 144Hz and 1080p at 240Hz " https://www.gamingscan.com/hdmi-vs-displayport-vs-dvi-vs-vga/

Yeah I read a few bits like that and it should work- but then lots of forum posts suggesting it doesn't. I've had a lot of problems with HDMI, a good DP cable is worth a try

 

[Glenwing]

I went into the Nvidia Cntrol Panel made a custom resolution (1920x1080 240hz) and selected it and turned vsync off. I go into the windows display and it says my resolution and refresh rate (as it should says 1920x1080 and 240hz) but when I go into the Display --> Advanced Display settings --> Display adapter Properties --> Monitor. It says 240hz is selected (normal) but when I check the box that says Hide modes this monitor cannot display it goes back down to 120hz. I would like some advice on why this is happening.

Just leave the Hide Modes box unchecked. Sounds like everything is working fine.