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LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby mushi » 03 Feb 2019, 10:11

Thanks on your insights on cru - but that doesn't solve the issue. (i've updated the cru image on the shared folder).
its August 2017. the contents of the service menu are on the shared folder.
Any way to update the firmware? how to improve even further your findings?
thx
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby k2viper » 03 Feb 2019, 11:12

You still get stuttering and unsmoothness with VT1304 239,760Hz resolution?

Are you sure that this CRU resolution on your screenshot is the only 240Hz resolution you have under Standard resolutions, Detailed resolutions, and Extension blocks? There should be no duplicates. Also remove any custom resolutions you may have created via Nvidia control panel.

VT1304, VT1182, VT1184 with actual 239,760 refresh rate should be non-issue if it actually enabled and works. I suppose you messed up something while creating many duplicated resolutions under wrong CRU sections.
I uploaded a .bin CRU file for you, with correct VT1304 resolution and no duplicates. Use CRU reset-all.exe before importing.

https://dropmefiles.com/fU9Dj

I dont know any ways to update firmware yet (and no sources of newer firmware too).
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby addi » 03 Feb 2019, 11:40

Well i use a VT1182... Also i enabled G-SYNC which does work perfectly.
I got Firmware 3.06 iirc, manufactured in december 2017.

Did you set "preferred refresh rate" to "highest available" in Nvidia control panel ?
Might try reset Nvidia settings aswell. And then check the setting again.

That setting caused some stutter in games iirc.

But I still get stutter / frameskipping or however you want to call it.

Did everything right in CRU for sure.

I think i'm done with that shit... I will return it and get something else.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby k2viper » 03 Feb 2019, 13:00

If someone is not sure didnt he messed up something in CRU i recommend reset resolution and monitor EDID settings using reset-all.exe from CRU bundle.
I have 3.06 fw and 239,760Hz VT1304 is buttery smooth for a year I have this unit. GPU was 1070 and now I have 1080, the same smoothness, no stutters.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby mushi » 03 Feb 2019, 14:20

k2viper, i followed your instructions, its the same. testufo is okay with your settings, just the game its not. i've wasted many hours in this. what games do you play?
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby k2viper » 03 Feb 2019, 14:40

Overwatch. Is perfectly smooth.
World of tanks - same. Why do you think its a monitor issue, if testufo is okay but the game you play stutters? It's more likely a game or gpu driver issue in this case.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby mushi » 03 Feb 2019, 17:34

144hz for me is smoothest. out of the box settings. try it and check if you notice a difference while jumping around at high speed.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby Kheri » 03 Feb 2019, 21:18

k2viper wrote:
Kheri wrote:Mine's version 3.07 (and it still has a bad strobing implementation).


Whats wrong with the strobing implementation on your unit?


It looks horrible, as I've said before. As for what exactly is wrong with it, I don't know. There are too many duplicated images, something like 3. It's noticeable in games, especially at 144hz+144fps. No amount of playing around with CRU changes the strobing, that I'm certain of because I have looked very carefully over 20 times AND when I switch to 1:1 aspect ratio, the direction of the strobing appears to change from the top being the most messed up to the bottom being messed up (an upside-down mirror image). Is it worth it? Maybe at 240hz, but then again, I really love motion clarity. I really love clear motion pictures. I didn't understand how people cannot notice low-persistence mode, but after having my experience on the LG, now I can. I keep trying once in awhile to see if I can get CRU to affect strobing.

Take the panning map test for example. There seems to be so much crosstalk on the vast majority of that map @ 240hz that most (or half?) of the reading clarity benefit of the strobing is gone. There are words I cannot read and the only reason is because I can see the duplicate images/letters overlapping each other. At 240hz, the duplicate images are fairly skinny so that's good, but at 120hz and 144hz they're pretty wide. This is a problem in games for accuracy reasons because you're trying to hit a target that's not as wide as they appear to be, so you miss. Even THINKING something is wider or in a different spot than it actually is, is a problem. I did not realize at first that this is what was happening to me in some situations, but I think it was. Also, too much strobing crosstalk coupled with the phantom array effect almost seems to have a "disorienting" effect at times; I want to know where I'm at when I spin around. And I'm guessing this monitor would benefit a fair amount by faster pixel response times. It's kinda poor in that regard compared to other 240hz monitors, IIRC and if I did my research right.

Tl;dr: CRU doesn't work for strobing. Too many duplicated images / crosstalk.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby Kheri » 03 Feb 2019, 21:22

mushi wrote:k2viper, i followed your instructions, its the same. testufo is okay with your settings, just the game its not. i've wasted many hours in this. what games do you play?


You have a unique LG 27GK750F-B because its version number is very low, not sure that's a good thing..
If you're not noticing the stutter in the testufo crosstalk test, then you've set the refresh rate on CRU up correctly and you should be good to go. However, a few times, I've had to turn off my monitor, switch MBR off then on, etc. to get stutter to disappear. I think it may have been my driver.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby k2viper » 04 Feb 2019, 07:19

Kheri wrote:You have a unique LG 27GK750F-B because its version number is very low, not sure that's a good thing..
If you're not noticing the stutter in the testufo crosstalk test, then you've set the refresh rate on CRU up correctly and you should be good to go. However, a few times, I've had to turn off my monitor, switch MBR off then on, etc. to get stutter to disappear. I think it may have been my driver.


Yes, if crosstalk test appears to have no stutters, monitor is indeed fine. So it's a game, GPU or driver to blame.

There can be something you may not even think about, e.g. I had an old GTX 260 with new (to date) VG278H monitor, and there was a problem with Team Fortress 2: if I use 2xx.xx driver versions everything is fine and game is smooth, but I cannot use Lightboost hack to enable strobing. Strobing worked with 3xx drivers but the game became unstable, lots of stutters and sometimes even driver stopped to respond. Card was OK indeed, because it worked perfectly with an old driver.
I ended up upgrading to 660GTX that time, it was just a bad luck combining and old game, old GPU and a newer driver.
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