[SOLVED] lg 27gl850-b only displaying option for 100hz not 144hz

[TheKittenSlay3r]

I bought the monitor recently and if I recall when I first set it up I was posting at 144hz and then when I swapped out GPU's to my 3080 I can only get the nvidia control panel to show me 100hz, it states that it only needs HDMI to hit 144hz not DVI (Not that the monitor has the ports for DVI anyways) Anyone out there with any idea on how to fix?

*Side note in Nvidia control panel my option to enable Gsync just isn't there

 

[Barty1884]

Did you remove old GPU drivers and reinstall new with the 3080?

While the monitor can do 1440p/144Hz over HDMI, as far as I know you still need to use DisplayPort for G-Sync.

 

[sizzling]

I’ve got the 27gl83-a which is nearly identical to your monitor and it only does 100Hz @ 1440p when using hdmi.

I just had a thought I never tried. Turn HDR off in the monitor settings and Windows. It might be a bandwidth issue with HDR on.

 

[sizzling]

Did you remove old GPU drivers and reinstall new with the 3080?

While the monitor can do 1440p/144Hz over HDMI, as far as I know you still need to use DisplayPort for G-Sync.

My understanding is no monitors support G-Sync over HDMI however bizarrely there are some TV’s that do, for example 2019 & 2020 LG OLED TV’s.

 

[Barty1884]

My understanding is no monitors support G-Sync over HDMI however bizarrely there are some TV’s.

I believe there are some, in theory at least.

It's to do with HDMI 2.1 AFAIK which is becoming more prominent on TVs already (for upcoming consoles) which has been slower to adopt on the monitor front. The OP's monitor should be HDMI 2.1, so theoretically can do it....but it's G-Sync 'compatible', not certified, so doesn't have the G-Sync module. So unless a driver launches to bring support, it's probably going to need DP for G-Sync for a while yet.

 

[sizzling]

Ok although the manual does say 1440p 144Hz is supported over HDMI it also says

Recommended Resolution
2560 x 1440 @ 100 Hz (HDMI)

As the recommended is 100Hz you might need to create a custom resolution to achieve 1440p 144Hz.

 

[Barty1884]

I'm assuming "adaptive-sync"is an option in the OSD? It needs to be 'off'for HDMI 100+Hz.

So if you want >100Hz with G-Sync, you'll need to use DisplayPort.

 

[TheKittenSlay3r]

Waiting on a display port cable now, strange that it supports 144hz at 1440p over HDMI but is only showing 100hz

 

[Barty1884]

Waiting on a display port cable now, strange that it supports 144hz at 1440p over HDMI but is only showing 100hz

Have you disabled Adaptive Sync in the OSD (on-screen display)? That's what the manual is saying.....

There also should've been a DP cable in the box, according to the 'accessories' listing on the product page:

ACCESSORY

• HDMIYes
• Display PortYes
• USB3.0 Upstream CableYes

https://www.lg.com/ca_en/desktop-monitors/lg-27GL850-B

 

[Glenwing]

The 27GL850 / 27GL83A are limited to 100 Hz over HDMI when FreeSync is enabled. You can use 144 Hz over HDMI if FreeSync is disabled.