Why the heck I can't tell a difference between ULMB2 on vs off at 540Hz ???

[GFresha]

I got me a PG248QP and overclocked it to 540Hz then turned on ULMB2 and for some reason the image brightness is the only thing that changes, the image looks literally the same lol...

Is it maybe because I am strobing at 540Hz and because unstrobed 540Hz just looks so clear already, that maybe the human eye can't see a difference, or is the difference noticeable but maybe I have some third variable?

I have tried:
1. match Hz to FPS
2. refresh rate headroom (tried strobing at 480, 360, no changes)
3. playing around with pulse width
4. doing various tests like this one https://www.testufo.com/map#pps=960&pur ... llscreen=1 and the image just looks like the same....
5. NVCP settings is obviously gsync turned off and monitor set to fixed refresh rate (nvidia removed ULMB option in control panel so I just keep it on in OSD)

I have not tried
1. reinstalling my graphics drivers
2. using 2000Hz+ polling rate (not sure if this will allow me to see a difference, it may help with tracking and moving mouse but not make ULMB suddenly start to work right?)
3. Any other ULMB2 monitors

Could it maybe be a hardware issue that the monitor shows ULMB2 is on and brightness dims a bit and changes with adjusting pulsewidth YET their is no strobing going on? (Anyone heard of something like this?)

Its either that or strobing 540Hz is useless since 540Hz is already pretty clear by itself

[Discorz]

Is it maybe because I am strobing at 540Hz and because unstrobed 540Hz just looks so clear already, that maybe the human eye can't see a difference...

Yes this can be the case if testing speed is too slow. Try much faster speeds! ULMB OFF vs ON at 500Hz at 1000 px/sec is only 2 vs 0.5 pixels of motion blur (depening on the pulse width setting and Hz). By tripling the speed u're tripling the visible difference too. At 3000 px/sec that is 6 vs 1.5 pixels. See Blur Busters Law - 1ms persistence = 1 pixel motion blur per 1000 pixels/second motion.

...or is the difference noticeable but maybe I have some third variable?

And more importantly, you must eye-track moving objects to benefit from strobing, otherwise you are immune to it. If u're not noticing much improvement in fast FPS game that might be the reason why. Most testufo tests pretty much force you to eye-track and that's why there is almost always a perceivable difference. In real world we're not eye-tracking 100% of the time.

[MSIfanboy]

i have same monitor, i just dont like how ULMB2 only works above 360hz, (the ULMB hack works at 250hz, someone here on the forums, disable overclock, and make a cru resolution with the same i think 970 pixel clock at 250hz, but the brightness is reduced)

i wish ulmb2 worked at 144/240/360/480/540 etc

because i am mainly playing apex atm, and my benq xl2546k looks clearer at 240hz with dyac

to be honest in motion, in game, all these ulmb2, dyac, elmb all look similar, regardless of the refresh rate

if you added a game environment background to the ufo test, it wouldnt be as noticeable

[GFresha]

Yes this can be the case if testing speed is too slow. Try much faster speeds! ULMB OFF vs ON at 500Hz at 1000 px/sec is only 2 vs 0.5 pixels of motion blur (depening on the pulse width setting and Hz). By tripling the speed u're tripling the visible difference too. At 3000 px/sec that is 6 vs 1.5 pixels. See Blur Busters Law - 1ms persistence = 1 pixel motion blur per 1000 pixels/second motion.

And more importantly, you must eye-track moving objects to benefit from strobing, otherwise you are immune to it. If u're not noticing much improvement in fast FPS game that might be the reason why. Most testufo tests pretty much force you to eye-track and that's why there is almost always a perceivable difference. In real world we're not eye-tracking 100% of the time.

Idk I still can't tell a difference, I have a feeling its not doing anything when I turn it on in OSD, either hardware issue with monitor/need to use a different DP cable (eventhough 540Hz works no problems) or possibly driver issue/need to reinstall nvidia drivers or clarity at 360Hz and 540Hz is already really good, that strobing at maxHz is not showing huge differences

[Discorz]

Idk I still can't tell a difference, I have a feeling its not doing anything when I turn it on in OSD, either hardware issue with monitor/need to use a different DP cable (eventhough 540Hz works no problems) or possibly driver issue/need to reinstall nvidia drivers or clarity at 360Hz and 540Hz is already really good, that strobing at maxHz is not showing huge differences

So did u try to eye-track faster speeds? Once u do that it should be fairly obvious.

The fact that pulse width is affecting the brightness should confirm that it's working.

[Supermodel_Evelynn]

Let's stop fooling ourselves and spreading this EVIL lie that you can't tell the difference between native 500 HZ and Strobing enabled?

The difference is obvious and strobing always wins, also does anybody know how hard it is to get 500 FPS in games?


STROBED IPS 120 HZ 120 FPS XG2431 Blur Buster 2.0



Native shitty TN panel 540HZ 540 FPS ASUS ULMB 2

[GFresha]

IDK bro I promise I can't tell a difference, either I am blind or my monitor is messed up...

But doesn't your second image prove my point with ULMB2 the asus panel should be better at 540Hz strobing than the xg2431 or atleast same not worse though?
idk now I am thinking of trying a dyac+ instead of ulmb2...

[GFresha]

Idk I still can't tell a difference, I have a feeling its not doing anything when I turn it on in OSD, either hardware issue with monitor/need to use a different DP cable (eventhough 540Hz works no problems) or possibly driver issue/need to reinstall nvidia drivers or clarity at 360Hz and 540Hz is already really good, that strobing at maxHz is not showing huge differences

So did u try to eye-track faster speeds? Once u do that it should be fairly obvious.

The fact that pulse width is affecting the brightness should confirm that it's working.

Yeah, is their a specific test you would like me to try at 3000 speed? Link me, I tried a few not sure if I was doing the right one

[Supermodel_Evelynn]

IDK bro I promise I can't tell a difference, either I am blind or my monitor is messed up...

But doesn't your second image prove my point with ULMB2 the asus panel should be better at 540Hz strobing than the xg2431 or atleast same not worse though?
idk now I am thinking of trying a dyac+ instead of ulmb2...

The XG2431 at 120 FPS strobing is clearly better vastly clearer than the ASUS 540 HZ without strobing in the second pic

I get that you can't see the difference 500 FPS is pretty fast especially in games with lots of stuff going on but from a scientific point of view with a test like what RTINGS uses you can see strobing will always be clearer.

Another way you notice this is in Street Fighter 6, cammy has the fastest walk speed and her default costume she has a 6 pack set of abs you can notice in strobing at 120 FPS walk speed with strobing it looks extremely clear

Where as 240 FPS its very clear but obviously not as clear as there is still noticeable blur

[Discorz]

Yeah, is their a specific test you would like me to try at 3000 speed? Link me, I tried a few not sure if I was doing the right one

Most of the tests will work. But I like to use Ghosting Test in full screen so that middle ufo is vertically centered. Here I linked ~3840 pps speed (actually 540fps * 7ppf = 3780pps). You might find it hard to eye track, but it has to be obvious at that speed. At screen center it should look similar to this:

- ULMB 2 OFF (7+ pixels of eye-tracking motion blur)
- ULMB 2 ON at PW 100 (2+ pixels of eye-tracking motion blur)