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LightBoost, G-SYNC, Turbo240: 120Hz Strobe Backlight LCDs / No Motion Blur! - Page 68

post #671 of 2929
I think most of the strain came from the fact that I read while scrolling a lot and it was impossible to do on the old monitor, even scrolling slowly things were unreadable.That being said I have my monitor in LB mode 100% of the time and it hasn't bothered me. The brightness is the thing that also gets me.
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Errdegahr Ktonos
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post #672 of 2929
Quote:
Originally Posted by mdrejhon View Post

Unlike the Asus (which has good colors), I noticed I had much more eyestrain with excess BENQ brightness (LightBoost turned off). So my cause of eyestrain is improper brightness adjustment; I'm not eyestrain-sensitive to PWM.

Totally agree the the brightness on the Benq is seriously excessive even at 0. Unfortunately the replacement I got from Amazon has streaks, almost like smudges going from the bottom to the middle. This is starting to get annoying, first permanelty lit pixels now smudges on the second. Is there any QC at Benq, I cannot believe someone quality testing these monitors did not notice the issues. The smudges are more noticeable than a permanetly white pixel as its noticeable even in games and not just on a vlack screen. Guess its another replacement for me frown.gif
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post #673 of 2929
Thread Starter 
Quote:
Originally Posted by Ryld Baenre View Post

I think most of the strain came from the fact that I read while scrolling a lot and it was impossible to do on the old monitor, even scrolling slowly things were unreadable.That being said I have my monitor in LB mode 100% of the time and it hasn't bothered me. The brightness is the thing that also gets me.
LightBoost certainly makes it possible to read text while a web browser is scrolling on the fly. That's a blurry mess on all other LCD's.

Have you ever tried adjusting the LightBoost OSD setting, to see how it affects reading while smooth scrolling?
post #674 of 2929
Quote:
Originally Posted by mdrejhon View Post

There can be more input lag using the Control+T method, and there's been some reports of instability problems. That's why enabling LightBoost while keeping stereoscopic disabled, is a highly favoured LightBoost mode on this forum.

Great, thanks! Lightboost won't affect FPS in any way, right?
Quote:
Originally Posted by Razor 116 View Post

Totally agree the the brightness on the Benq is seriously excessive even at 0. Unfortunately the replacement I got from Amazon has streaks, almost like smudges going from the bottom to the middle. This is starting to get annoying, first permanelty lit pixels now smudges on the second. Is there any QC at Benq, I cannot believe someone quality testing these monitors did not notice the issues. The smudges are more noticeable than a permanetly white pixel as its noticeable even in games and not just on a vlack screen. Guess its another replacement for me frown.gif

Is this the same for all BenQ monitors like my XL2420TX?
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post #675 of 2929
Lightboost has nothing to do with the video card's bandwidth or fill rate. That's why you can 'activate' it by initializing the timings, and then plug the monitor from an Nvidia video card to an Ati video card. It SHOULD be possible, since it's NOT videocard dependent, to send it a custom DDC/CI signal to trick it into activating lightboost (after a hard power off--plug, not power button) without an Nvidia card. Thus your FPS isn't affected at all.

The "problem" with lightboost is you want FPS to match refresh rate as much as possible. And it doesn't matter whether vsync is on (with triplebuffering) or off...the image will look VERY stuttery if your FPS drops more than 5 fps under the refresh rate of 120. And if it it drops by half often, you are far better off using 144 hz mode without lightboost. CRT's can handle that drop in framerate better than lightboost LCD's. The LCD "double image" effect of having 60 FPS@120 hz refresh rate with lightboost enabled is far worse than a CRT at 60fps @ 120 hz.

So depending on the game you're playing, you need to test and see if you can maintain an average of 120 fps and have it drop no lower than 100. Otherwise you're better off at 144 hz. So don't bother doing this in Crysis 3 or Battlefield 3. BF3's framerate can drop into the 70's regardless of how many video cards you are using, unless you're using a 6 core CPU or have a VERY high overclock.
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post #676 of 2929
Thread Starter 
Quote:
Originally Posted by Falkentyne View Post

So depending on the game you're playing, you need to test and see if you can maintain an average of 120 fps and have it drop no lower than 100. Otherwise you're better off at 144 hz. So don't bother doing this in Crysis 3 or Battlefield 3. BF3's framerate can drop into the 70's regardless of how many video cards you are using, unless you're using a 6 core CPU or have a VERY high overclock.
Actually, I've gotten rave reviews from Battlefield 3 users (I can easily quote a bunch), but they all have had SLI (dual 680's, 690's or Titan's). Apparently, it's good enough to benefit Battlefield 3. But it certainly benefits source engine games such as CS:GO more since that easily consistently stays at 120fps.

It doesn't look bad per se at 70fps, and as long as that's your minimum average framerate, and you often run at higher, you're still going to have the LightBoost fun most of the time.

If you fall below 60fps all the time, that's a different story altogether -- 144 Hz non-LightBoost will probably benefit sub-60fps-average games more.

Also, LightBoost supports 100Hz. So you get LightBoost benefit for anything higher than 50fps in this situation. Longer strobe lengths are used, so adjust your LightBoost OSD setting downwards a little bit.
Edited by mdrejhon - 3/12/13 at 7:44pm
post #677 of 2929
Quote:
Originally Posted by mdrejhon View Post

Actually, I've gotten rave reviews from Battlefield 3 users (I can easily quote a bunch), but they all have had SLI (dual 680's, 690's or Titan's). Apparently, it's good enough to benefit Battlefield 3. But it certainly benefits source engine games such as CS:GO more since that easily consistently stays at 120fps.

It doesn't look bad per se at 70fps, and as long as that's your minimum average framerate, and you often run at higher, you're still going to have the LightBoost fun most of the time.

If you fall below 60fps all the time, that's a different story altogether -- 144 Hz non-LightBoost will probably benefit sub-60fps-average games more.

Also, LightBoost supports 100Hz. So you get LightBoost benefit for anything higher than 50fps in this situation. Longer strobe lengths are used, so adjust your LightBoost OSD setting downwards a little bit.

I thought it will be stuttery if it falls more than 5fps below 120Hz? Then that means my fps should be greater than 115 in order to have complete smoothness of any game?
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post #678 of 2929
It will look stuttery but not bad. It only gets bad when your FPS starts approaching 60. THEN it gets bad.

Mark, how do you get LB working at 100hz refresh rate for 100 fps vsync on? The CRU timings were only for 120 hz....
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post #679 of 2929
Thread Starter 
Quote:
Originally Posted by Falkentyne View Post

It will look stuttery but not bad. It only gets bad when your FPS starts approaching 60. THEN it gets bad.

Mark, how do you get LB working at 100hz refresh rate for 100 fps vsync on? The CRU timings were only for 120 hz....
I have a 3D emitter, so I can switch to any 3D Vision supported timings without CRU. I swear... It is an order of magnitude easier to enable LightBoost when you have the nVidia 3D Vision emitter built into your monitor (VG278H). I own both the Asus VG278H and the BENQ XL2411T.

I can easily snoop the 100 Hz timing in nVidia Custom Resolution (the vendor official custom resolution utility), and copy it to CRU. I can write down the numbers for any LightBoost supported refresh rate between 100.0 Hz and 120.0 Hz, in 0.001 Hz increments; the only key ingredient is a larger Vertical Total for all of them. As a rule of thumb, the same numbers generally usually work at 100 Hz and 120 Hz -- only the dotclock / scan rates / Hz are different.

120 Hz is just the mode in highest demand; since it has lower input lag, it's the highest supported LightBoost refresh rate.
Edited by mdrejhon - 3/12/13 at 9:53pm
post #680 of 2929
Thread Starter 
A very useful article:
"Why Do Some OLED's Have Motion Blur?"

I would like to buy an OLED monitor -- It could eventually be The Holy Grail -- but unfortunately the first cheap OLED monitors is likely to have the sample-and-hold issue, which means even 0ms instant pixel response still has motion blur. I'm not expecting all correct OLED checkboxes to be checked off until sometime in the 2020's at the consumer market level (rather than the elite high-cost level).
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