Benq XL2420T PROBLEM! Cant set 120hz at 1080p. Only lower res.

maxolina · 27 Feb 2012 at 20:51

EDIT: I sent a mail to my laptop manufacturer and they said that the output is only Single-Link DVI. Sucks.

Hello guys,

I just got this beauty of a monitor, and it's fantastic.

The only problem is I can't set it to 120hz at 1920x1080p. It only goes up to 60hz at that resolution.

If I want 120hz I'd have to go down to 1020x768...

Before you stay it, I am using a Dual Link DVI cable.

Both in the Windows Control Panel and in the Catalyst Control Center it shows that I cant get 120hz at 1080p.

Now as you should know the monitor is made for 120hz at 1920x1080 so I wonder where the problem lies.

Surveyor · 27 Feb 2012 at 20:54

Hi and welcome to the forum.

What graphics card are you using?

You may be using the dual link cable but do you have it connected to a dual link DVI connector on your graphics card?

A lot of the AMD 6 series cards, for example, have 2 DVI connectors but only one of them is dual link.

cmndr_andi · 27 Feb 2012 at 20:54

Hi there,

May I ask what graphics card you are using and are you certain it is plugged into a dual-link DVI display output on your graphics card? (as many AMD HD 6000/7000 series have only one dual link, the other is single link).

Edit: beaten by Surveyor

Surveyor · 27 Feb 2012 at 20:59

cmndr_andi said:
Edit: beaten by Surveyor

I'll let you answer when he replies.

maxolina · 27 Feb 2012 at 21:04

It's connected to a HD6970M, wich has a Dual-Link DVI output. I can tell it just by looking at it, but here you have the specs http://www.amd.com/us/products/note...md-radeon-6900m/Pages/amd-radeon-6900m.aspx#2

cmndr_andi · 27 Feb 2012 at 21:14

Aye, it has the ability to output dual link, but that doesn't necessarily mean that the laptop manufacturer made use of it.

May I ask what make and model number laptop you are using?

maxolina · 27 Feb 2012 at 21:18

It's a XMG p501 pro

EDIT: The output port is exactly this one

It means they made use of the Dual Link DVI

Surveyor · 27 Feb 2012 at 21:31

maxolina said:
It means they made use of the Dual Link DVI

Not necessarily.

A single link connector looks exactly the same it's just the middle 6 pins aren't connected internally.

In the image below only one of the DVI connectors is dual link but they both look the same:

maxolina · 27 Feb 2012 at 21:46

Oh alright.

But still, with the old monitor I couldn't run 120hz on any resolution..

Now I can, but only up to 1024x768...

Surveyor · 27 Feb 2012 at 21:55

maxolina said:
Oh alright.

But still, with the old monitor I couldn't run 120hz on any resolution..

Now I can, but only up to 1024x768...

If it is single link perhaps that's the highest resolution it supports at 120Hz.

Do you have a user manual which tells you if it's single or dual link?

My Google skills on German notebooks fail me.

Surveyor · 27 Feb 2012 at 21:57

@ cmndr_andi

Have you found anything?

I can't find any informtion on whether or not the DVI is dual link.

cmndr_andi · 27 Feb 2012 at 22:08

Yea, I haven't seen anything which confirms it either way - and no mention of people running 120Hz monitors with.

Though I have seen mention on product pages of:

NVIDIA ® GeForce ® GTX 580M 2048MB GDDR5 RAM Features: DirectX ® 11, Dual Link DVI, HDMI 1.4a, NVIDIA ® PhysX ™ as an alternative: AMD Radeon HD 6990M ® 2048MB GDDR5 RAM Features: DirectX ® 11, HDMI 1.4

Hopefully that doesn't mean that the dual-link DVI is only connected up for the Nvidia graphics options (to make use of 3D vision).

Surveyor · 27 Feb 2012 at 22:15

I found that on the product pages but it doesn't mention DVI at all for the AMD graphics option so it's a bit confusing and perhaps the mention for Nvidia only is, as you say, not a good sign.

maxolina · 27 Feb 2012 at 22:22

That would be disappointing.....

I guess it means that I'll have to save up for a decent desktop build.... I regretted buying this notebook already the first day I bought it.... **** it was even expensive...

I'll have to decide if it's better to play games in 1024x768@120 or 1920x1080@60

Surveyor · 27 Feb 2012 at 22:35

maxolina said:
That would be disappointing.....

Why don't you send them an e-mail asking for confirmation?

If they say it's single link then unfortunately you're stuck.

If they say it's dual link then there's something else going on and you can come back to it.

Either way please post their reply as it may come in handy for someone else.

Disco Boy · 27 Feb 2012 at 23:15

maxolina said:
That would be disappointing.....

I guess it means that I'll have to save up for a decent desktop build.... I regretted buying this notebook already the first day I bought it.... **** it was even expensive...

I'll have to decide if it's better to play games in 1024x768@120 or 1920x1080@60

Try it at 1920x1080... I'll be surprised of you can get over 60fps in modern games anyway...

That is assuming that you are one of the few people who can see a gain over 60fps.

Xeanor · 27 Feb 2012 at 23:46

Disco Boy said:
Try it at 1920x1080... I'll be surprised of you can get over 60fps in modern games anyway...

That is assuming that you are one of the few people who can see a gain over 60fps.

Everybody can see a difference between 60fps @ 60Hz and 120fps @ 120Hz.

OptimaLnrg · 27 Feb 2012 at 23:54

Xeanor said:
Everybody can see a difference between 60fps @ 60Hz and 120fps @ 120Hz.

This.

It's a mahoosive difference.

maxolina · 28 Feb 2012 at 06:34

I was skeptik when I bought the monitor, thinking you notice a small difference.

After I played some quake live on 1024x768@120, I tried to go back to 60hz. WoW. Everything looked so stuttery and not smooth at all........It's a huge difference

maxolina · 28 Feb 2012 at 11:23

I received an answer from the laptop manufacturer. They said the output is only Single-Link DVI.

Sucks.. Now I cant use the monitor to it's full potential ****ing god