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

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addi
Posts: 16
Joined: 02 Feb 2019, 12:42

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

Post by 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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k2viper
Posts: 293
Joined: 23 Jan 2018, 06:30

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

Post by 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.

mushi
Posts: 32
Joined: 02 Feb 2019, 11:46

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

Post by 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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k2viper
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by 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.

mushi
Posts: 32
Joined: 02 Feb 2019, 11:46

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

Post by 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.

Kheri
Posts: 59
Joined: 29 Sep 2018, 13:39

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

Post by 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.

Kheri
Posts: 59
Joined: 29 Sep 2018, 13:39

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

Post by 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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k2viper
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by 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.

mushi
Posts: 32
Joined: 02 Feb 2019, 11:46

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

Post by mushi » 07 Feb 2019, 05:59

edit: see my next post in this page

Thank you for all your help.

The stuttering and frameskip is almost solved. I ended up using NVCP exclusively to tweak the values, since I could test it (frame skip and crosstalk) straight away and see if it was smooth, even though NVCP doesn't let me tweak the values much.
Now its almost perfect, its good enough. At first, i've managed to get good results at 239hz, but then i got good results at 240hz also. I haven't tested the limits (vertical frequency) without frameskip. ive slightly tested 242hz but with skips.

So here's what I got:
239hz
239_ok2.PNG
239_ok2.PNG (23.8 KiB) Viewed 5845 times

and 240hz
240_ok2.PNG
240_ok2.PNG (23.43 KiB) Viewed 5845 times
I've been tweaking the Vertical total pixels, between 1280 and 1304, for now its ok. The "problem" in NVCP is that no matter what decimal digits i put in Refresh rate (240.xxx), it always resets to .000
I might give CRU another chance though (after removing the custom resolutions in NVCP). The problem i got with CRU, I never knew which modes were actually set. thats ignorant from me, i should have seen some tutorials first. (also the OSD doesn't show actual refresh rate, it always shows either 60, 120, 144 or 240)
I wonder if this kind of overclock does any harm to the monitor in the long run. Also I wanted to know how to reset the timing settings to the monitor's defaults (I assume its the automatic option in the combobox?).

Thanks everyone, and for the ones that i saw complaining about this monitor in this thread - don't. just fiddle around a bit and it will be fine. There are good deals for this monitor if you look for them (<300 eur/usd)
Last edited by mushi on 23 Apr 2019, 12:12, edited 1 time in total.

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k2viper
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Post by k2viper » 07 Feb 2019, 08:58

To reset custom resolutions and CRU settings, manually remove custom resolutions created in NVCP and use reset-all.exe from CRU bundle.

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