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XL2411Z StrobeUtility -> Crosstalk/1440x1080/More than 120hz?

post #1 of 6
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Hi!

I'm pretty new to the 144hz monitor scene and just used this tutorial https://www.youtube.com/watch?v=ZvsmO5cjB6A to set up my BenQ XL2411Z. I mainly use this monitor for playing Counter-Strike Global Offensive and there I play with a 1440x1080 stretched resolution.

I got some questions/problems and hope you can help me with that smile.gif

1. First problem is that I think I have a lot of crosstalk (like black lines which look like Honeycombs, I guess thats crosstalk) when using 1440x1080 resolution. I got an amd gpu so I'm using CRU. These are the settings for regular 1920x1080p:



And this for my stretched resolution 1440x1080p:



Is there anything that I can tweak to solve this? GPU scaling is deactivated because I get less fps with it and I can't get it to be stretched.

2. I'm using currently 120hz because in the guide it said with the strobe utility you can only use 120hz but I read 125hz is possible, too. Is there any disadvantage to use more than 120hz (like can it fry or something?).

3. Is the utility the right thing for games like CSGO or should I just use regular 144hz?

Thanks for reading this and thanks in advance for any help/advice smile.gif

Greetings kikyou2
post #2 of 6
You could test your cross-talk with something like UFOtest.

Then try different settings to see what you like.

Some users like the blur reduction, but others find that 120 or 144 is enough to reduce blur to a point that they do not care.

Every user is different and some are sensitive to the flicker even at 120/144.

I have always seen more cross-talk at higher refresh rates. If your frame rates do not stay perfect, blur reduction can cause a double image effect sometimes as well.

If you look around you may see that changing the vertical total on some of these screens can push the cross-talk lower on the screen and even right off(at lower refresh rates in my case). This does add some input delay that you may or may not notice.

I am not 100% sure these tweaks work on non native resolutions however.

If you do not mind some color issues(because it was designed for 3d glasses), you may want to try to enable lightboost. It tends to have less cross-talk.
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post #3 of 6
For 120hz please set the Vertical Total to 1500.
I found that 1502 is actually unstable sometimes and can cause random frame skipping (this only happens on a monitor hard refresh or resolution change and its random whether it happens or not. This never happens at VT 1500 however).

At 100hz, VT 1502 is perfectly stable.

Please note: there is absolutely *NO* difference between VT 1497-VT 1502 whatsoever, except which one is stable or which one causes frame skipping and pulsating backlight. Each one causes the (internal) scaler to report 1280x1440, which is why the crosstalk is reduced (1080 ->1440), I'm not going to explain why. You can check my post on the blur busters' forums which explains why. The TL;DR version is the scaler gets confused by the change in blanking interval and thinks the actual vertical resolution is larger.

As far as your 1440x1080 problem, you're completely out of luck.
The ONLY way to get low crosstalk at 1440x1080 is to enable GPU scaling for the 1920x1080 resolution with the VT tweak gets applied and downsampled. If you try using a VT 1500 tweak at 1440x1080 by changing the Vertical total, you will LOSE the ability to use 1:1 pixel mapping as neither the monitor OSD or the video card 1:1 option will function and you will locked to full screen.

Second: How are you getting LESS frames per second with GPU scaling at 1440x1080?
Are you using a 10 year old CPU or something?
You should be getting MORE frames per second at 1440x1080 than 1920x1080 because the resolution is lower! Mind explaining what's going on?

Third: again, use VT 1500 not VT 1502 at 120hz.

Fourth:
for lowest possible input lag when using a VT tweak, which will remove ALL added input lag from enabling blur reduction, you want the STROBE PHASE set as high as possible. You want to set it to the point right below where the backlight will shut off. At 120hz with a VT tweak, this cutoff is strobe phase 049. At 100hz, this cutoff is 059. The math and the reasoning behind this is explained in that thread I linked.

http://forums.blurbusters.com/viewtopic.php?f=13&t=2590

At this cutoff, the strobe DUTY will be equal to 001, which will give you a very dim screen (the maximum strobe duty allowed is determined by the maximum strobe phase allowed before monitor backlight shut-off). So at 120hz, Phase 049, the Duty is 001, which is too dim to use. To raise the maximum strobe duty, you must lower the strobe phase by a few points. So going backwards (please use your brain, just like if you were in math class), Strobe phase 044 (5 lower) would give you a maximum strobe duty of 006 (001 + 5). Strobe phase 043 would give you a maximum strobe duty of 007.

This *ONLY* applies when using a Vertical total tweak which limits the maximum strobe phase.

if you were for example NOT using a VT tweak, this doesn't apply and there is an input lag buffer added also e.g. Strobe phase 100 would NOT be equal to strobe duty 001 because there is a buffer added (LONG STORY).

In our example: for 100hz and VT tweak, strobe phase 054 gives a maximum strobe duty of 006 and strobe phase 053 = duty 007.

BTW you can use VT 1502 tweak at 125hz refresh rate (I found VT 1497 to be the most stable at 125hz). the highest refresh rate that can accept VT tweaks is 128hz. But 125hz syncs perfectly with 500hz polling rate Mouses as 500/4=125).
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post #4 of 6
Quote:
Originally Posted by Falkentyne View Post

For 120hz please set the Vertical Total to 1500.
I found that 1502 is actually unstable sometimes and can cause random frame skipping (this only happens on a monitor hard refresh or resolution change and its random whether it happens or not. This never happens at VT 1500 however).

At 100hz, VT 1502 is perfectly stable.

Please note: there is absolutely *NO* difference between VT 1497-VT 1502 whatsoever, except which one is stable or which one causes frame skipping and pulsating backlight. Each one causes the (internal) scaler to report 1280x1440, which is why the crosstalk is reduced (1080 ->1440), I'm not going to explain why. You can check my post on the blur busters' forums which explains why. The TL;DR version is the scaler gets confused by the change in blanking interval and thinks the actual vertical resolution is larger.

As far as your 1440x1080 problem, you're completely out of luck.
The ONLY way to get low crosstalk at 1440x1080 is to enable GPU scaling for the 1920x1080 resolution with the VT tweak gets applied and downsampled. If you try using a VT 1500 tweak at 1440x1080 by changing the Vertical total, you will LOSE the ability to use 1:1 pixel mapping as neither the monitor OSD or the video card 1:1 option will function and you will locked to full screen.

Second: How are you getting LESS frames per second with GPU scaling at 1440x1080?
Are you using a 10 year old CPU or something?
You should be getting MORE frames per second at 1440x1080 than 1920x1080 because the resolution is lower! Mind explaining what's going on?

Third: again, use VT 1500 not VT 1502 at 120hz.

Fourth:
for lowest possible input lag when using a VT tweak, which will remove ALL added input lag from enabling blur reduction, you want the STROBE PHASE set as high as possible. You want to set it to the point right below where the backlight will shut off. At 120hz with a VT tweak, this cutoff is strobe phase 049. At 100hz, this cutoff is 059. The math and the reasoning behind this is explained in that thread I linked.

http://forums.blurbusters.com/viewtopic.php?f=13&t=2590

At this cutoff, the strobe DUTY will be equal to 001, which will give you a very dim screen (the maximum strobe duty allowed is determined by the maximum strobe phase allowed before monitor backlight shut-off). So at 120hz, Phase 049, the Duty is 001, which is too dim to use. To raise the maximum strobe duty, you must lower the strobe phase by a few points. So going backwards (please use your brain, just like if you were in math class), Strobe phase 044 (5 lower) would give you a maximum strobe duty of 006 (001 + 5). Strobe phase 043 would give you a maximum strobe duty of 007.

This *ONLY* applies when using a Vertical total tweak which limits the maximum strobe phase.

if you were for example NOT using a VT tweak, this doesn't apply and there is an input lag buffer added also e.g. Strobe phase 100 would NOT be equal to strobe duty 001 because there is a buffer added (LONG STORY).

In our example: for 100hz and VT tweak, strobe phase 054 gives a maximum strobe duty of 006 and strobe phase 053 = duty 007.

BTW you can use VT 1502 tweak at 125hz refresh rate (I found VT 1497 to be the most stable at 125hz). the highest refresh rate that can accept VT tweaks is 128hz. But 125hz syncs perfectly with 500hz polling rate Mouses as 500/4=125).
Great write up.
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post #5 of 6
I'm surprised you actually followed that. Most people have no idea what I'm saying (it's actually quite easy if you're using the monitor and actually testing exactly what is going on)
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post #6 of 6
I have had interest in blur reduction for a while.

I have a XL2420Z so I have played with the feature as well.
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