Blur Busters Forums

Who you gonna call? The Blur Busters! For Everything Better Than 60Hz™ Skip to content

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

Everything about displays and monitors. 120Hz, 144Hz, 240Hz, 4K, 1440p, input lag, display shopping, monitor purchase decisions, compare, versus, debate, and more. Questions? Just ask!

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

Postby k2viper » 02 Feb 2018, 13:29

Finally I'm posting some pictures. Sorry for crosstalk pics, I tried to follow moving ufos with hand and chose "sport" mode which should use short shutter time.

First, is 240hz+MBR+VT1306 mode (pixelclock 639mhz). Kinda maximum VT i can get with smooth picture with no frameskips. Mode I currently stick at.

Image Image Image

280hz overclocked mode. Shows out of sync message in Russian (my display dont have English in OSD, just asian languages + Russian + Ukrainian). Frameskips, unfortunately :(

Image

Same for 260hz. Frameskips.

Image

241hz with reduced timings. Frameskips. Looks like reduced timings leads to frameskipping, and this was the cause of unsmoothness I mentioned in previous post.

Image

Tried 180hz with VT ??? (forgot, used maximum to fill pixelclock). Works, but looks like strobing dont work outside 120/144/240-242hz, MBR feature greyed out.

Image

Finally I tried "ultraclean 120hz" mode with max VT I could get working. Max working was between 1580 and 1600. But, I wasnt impressed by picture quality honestly. Crosstalk reduced compared to default 120hz, but 240hz with VT 1306 looks fairly better imho.

Image Image
User avatar
k2viper
 
Posts: 290
Joined: 23 Jan 2018, 06:30

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

Postby Falkentyne » 03 Feb 2018, 17:18

Sort of similar to my findings when using certain Vertical Totals on Benq Mstar 8556T based monitors (XL2720Z, XL2420Z, XL2411Z, etc). Certain VT's at certain refresh rates will ALWAYS cause stutter from the panel.
1920x1080 @ 85hz, @ VT 1502, VT 1500, 1499, 1498 and 1497 will almost always stutter when switching resolutions to this or on a mode switch in the OSD. But VT 1501 works just fine...

Never heard about inverting porch values before though. That trick never worked on Benqs. Haven't tried it on any newer Benq. Still debating on whether to get a Realtek 2796BF based Benq monitor (XL2735) or that Dell S2716DG to try Gsync+ULMB at the same time on my laptop.
Falkentyne
 
Posts: 2537
Joined: 26 Mar 2014, 07:23

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

Postby lexlazootin » 03 Feb 2018, 21:41

If you get a 240hz you can do the G-Sync+ULMB trick up to 155hz instead of the 120hz max.

Be a ware that it's not a completely smooth experience, every frame dip sub millisecond long will adjust the brightness and flicker. Even in HL1 it's not completely stable.
User avatar
lexlazootin
 
Posts: 1251
Joined: 16 Dec 2014, 02:57

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

Postby Falkentyne » 03 Feb 2018, 23:37

Would you say it's worth spending the $500 for the Dell TN monitor?
Falkentyne
 
Posts: 2537
Joined: 26 Mar 2014, 07:23

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

Postby lexlazootin » 04 Feb 2018, 00:20

Well you already have a 144hz monitor, unless you want the 1440p or the G-Sync/ULMB it might not be worth it. I think personally you have more to gain from a 240hz, you get higher ULMB+G-Sync and the added bonus of having a 240hz monitor. The only down-side is it's not 1440p and the price.

Only you can really decide if it's worth it.
User avatar
lexlazootin
 
Posts: 1251
Joined: 16 Dec 2014, 02:57

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

Postby k2viper » 04 Feb 2018, 07:04

Falkentyne wrote:Sort of similar to my findings when using certain Vertical Totals on Benq Mstar 8556T based monitors (XL2720Z, XL2420Z, XL2411Z, etc). Certain VT's at certain refresh rates will ALWAYS cause stutter from the panel.
1920x1080 @ 85hz, @ VT 1502, VT 1500, 1499, 1498 and 1497 will almost always stutter when switching resolutions to this or on a mode switch in the OSD. But VT 1501 works just fine...


My finding is that stutter/unsmoothness I was getting at higher then 240hz refresh rates was due to frameskipping.
User avatar
k2viper
 
Posts: 290
Joined: 23 Jan 2018, 06:30

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

Postby Chief Blur Buster » 04 Feb 2018, 13:40

Frameskipping is not the exact same thing as simple stutters -- however, both can exist at the same time (e.g. stutters not caused by frameskipping, stutters caused by frameskipping)

To rule things out....
Could you take a few photos of http://www.testufo.com/frameskipping at Windows desktop

Do this with both G-SYNC enabled and disabled. (Windows won't vary the refresh rate, but the frameskipping mechanics of DWM may change) . Need to capture several with 40-square sequences to capture the 1-in-40. Camera exposure about 1/6 sec (use smartphone app), CPU set to 100% and all apps not running, to make sure browser is running flawlessly.

I don't think there is frameskipping in this G-SYNC monitor but I would love to definitively confirm.


EDIT: I noticed you edited your post and posted pictures. Thanks!
Head of Blur Busters - BlurBusters.com | TestUFO.com | Follow @BlurBusters on Twitter

       To support Blur Busters:
       • Official List of Best Gaming Monitors
       • List of G-SYNC Monitors
       • List of FreeSync Monitors
       • List of Ultrawide Monitors
User avatar
Chief Blur Buster
Site Admin
 
Posts: 6409
Joined: 05 Dec 2013, 15:44

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

Postby k2viper » 05 Feb 2018, 01:37

This LG display do not support G-SYNC, its freesync but I dont have an AMD graphics card to test its VRR mode.
User avatar
k2viper
 
Posts: 290
Joined: 23 Jan 2018, 06:30

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

Postby k2viper » 06 Feb 2018, 04:43

LG provides a software tool called OnScreenControl for their monitors, and it can change all OSD features via software.

Doesnt this mean that LG is fully DDC/CI controllable?
How a user like me, can discover if there is hidden DDC/CI control options (regarding strobe timings, as its done for Benqs via Strobe utility)?
Sorry for the inconvinience.
User avatar
k2viper
 
Posts: 290
Joined: 23 Jan 2018, 06:30

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

Postby Chief Blur Buster » 06 Feb 2018, 09:06

From the pictures I am seeing, your monitor is indeed frameskipping. (at 280 Hz overclocked)
Head of Blur Busters - BlurBusters.com | TestUFO.com | Follow @BlurBusters on Twitter

       To support Blur Busters:
       • Official List of Best Gaming Monitors
       • List of G-SYNC Monitors
       • List of FreeSync Monitors
       • List of Ultrawide Monitors
User avatar
Chief Blur Buster
Site Admin
 
Posts: 6409
Joined: 05 Dec 2013, 15:44

PreviousNext

Return to General — Displays, Graphics & More

Who is online

Users browsing this forum: eRvY, MSN [Bot] and 18 guests