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LightBoost, G-SYNC, Turbo240: 120Hz Strobe Backlight LCDs / No Motion Blur! - Page 130

post #1291 of 2929
Quote:
Originally Posted by CallsignVega View Post

http://www.testufo.com/ is now working so I am compiling my notes on the new XL2420TE vs VG248QE vs XL2720T and should have the info out soon.
Great news can't wait for the comparison!
post #1292 of 2929
Quote:
Originally Posted by CallsignVega View Post

http://www.testufo.com/ is now working so I am compiling my notes on the new XL2420TE vs VG248QE vs XL2720T and should have the info out soon.

Excellent, look forward to it! thumb.gif
post #1293 of 2929
Just a small comparison in Lightboost mode between the 24" 144 Hz Asus VG248QE (this one has matte film removed), the new 24" 144 Hz BenQ XL2420TE with zero-PWM and the 27" 120 Hz BenQ XL2720T.

I was interested in doing a little comparison due to the seemingly wide variances in picture quality and ghosting between monitors in Lightboost mode. I've just received three XL2420TE which are new models and I hoped would bring good image quality and low Lightboost ghosting in one package.

Please be advised that pictures and videos usually cannot do justice versus "real world" viewing and comparison of the monitors, so I will be adding commentary to the media. All monitors are set to 120 Hz, 10% Lightboost mode (the fastest) and 50% contrast ratio. I found on all three models if you strayed too far off from 50% contrast, the picture quality suffered too much.

These tests are done with driver 326.19. I also tested a much older driver to see if it helped the 24" monitors picture quality, but it did not.

Firstly, the XL2420TE does in fact use the same exact panel as the BenQ XL2411T and the Asus VG248QE. This is good in the regard of least ghosting, but is also bad in the picture quality department.

All images and video are the XL2720T on the left, the XL2420TE in the center and the VG248QE on the right.




This is a completely dark room and once again I would like to point out a camera will overexpose black levels and back light bleed versus real world viewing. For a point of reference, the Xl2720T in real world viewing has a nice, quite black and very uniform black screen. It is very impressive for it to look that good in Lightboost mode.

The XL2420TE in the center has the worse "blacks" and are actually more of a dark grey than anything. The VG248QE on the right was about 60% the strength of the Xl2420TE, so still quite far from the blacks on the XL2720T. One annoying aspect of the "grey-ness" of the blacks on the 24" models is that it isn't very uniform and for some unusual reason I have yet to discover, only happens in LB mode.

In this video you can see the XL2720T's better blacks and contrast:

http://www.youtube.com/watch?v=eMnZGFTnjbQ


You can also see the same thing in this next video. The XL2720T does a very good job with this black test with deep blacks and proper subtle differences between the darkest blocks. The other two overexposing and showing off their poor contrast with large bright gradients to the black boxes with the XL2420TE once again trailing the pack:

http://www.youtube.com/watch?v=eMnZGFTnjbQ





Surprisingly, whites are quite accurate in this photo. Even more surprising is that the best "whites" come from the Xl2420TE. The other two monitors were a bit "muddier-red" in their whites, but no adjustment's were made in NVIDIA control panel to keep the comparison on an even footing.

Xl2720T showing off it's better contrast in the white test, with blocks 247 through 251 outpacing the other two:

http://www.youtube.com/watch?v=GTY4aY9vuiE





In this picture is the contrast on a white web site. Although the Xl2420T in the center had the best whites, it also had the most "bleached out" contrast and was less pleasing on the eyes to read said web site.


Image quality test:

http://www.youtube.com/watch?v=NMOd_gbRj5c

Rank: #1 XL2720T, #2 de-matted VG248QE, #3 XL2420TE.


Moving on to motion quality and ghosting. All monitors tested at a 1.4ms MPRT as they should. I tried taking "ghosting" video but at 60 FPS, the camera did not capture what I feel is a good enough representation. Although, I did get some fairly good images of particular effects seen.


All motion tests are courtesy of www.testufo.com from Mark, the designer of www.blurbusters.com

Here is the XL2720T under the very demanding "Marquee" test that is very unforgiving for ghosting on all display types:



This is where the Xl2720T starts to run into some issues. It does have a quite pronounced ghost and in real life actually looks a bit worse than this image.


Both the XL2420TE and the VG248QE are almost perfect in this test:







Here, in the vertical scrolling the XL2720T once again falls behind the other two in these images:






The 24" models coming out crystal clear:








More ghosting tests in order from monitors left to right using a very high shutter speed:






Next set:






And the last set:






So once again, what we have here is a compromise and what do you prioritize more. The 24" models are clearly the best if ghosting is of a concern to you. The Xl2720T has quite a bit better picture then the 24" models, but you do pay a price with the ghosting. One thing to note with the Xl2420TE is it did have some "scan lines" in the corners, and also produced a strange "ripple effect" during movement that the two other display did not have. This "ripple" is hard to describe, and the only reason I can think that the Xl2420TE has it is because of the new LED's or controller they used in this model. It was quite annoying and another reason to not recommend this model for Lightboost.

As for the XL2420TE, I would not recommend the monitor if you are going to be using Lightboost mode. The Zero-PWM feature does not help here and it's $150 more than the VG248QE. The Xl2420TE did look fine in normal 144 Hz mode and didn't have the huge blacks/contrast issues. It will be up to you if the zero-PWM flicker feature is worth the extra $150 and you want to run normal non-Lightboost 144 Hz.

Personally, I view the jump from 144 Hz non-LB to 120 Hz LB about as big of a jump in motion clarity as going from 60 Hz to 120 Hz non-LB.


One last video of the monitors, this time in Falcon 4 BMS:

http://www.youtube.com/watch?v=kNy6yx3Tec8


How much did the matte-removal on the VG248QE help it out versus the XL2420TE? Since they have the same panel, apparently quite a bit. I did not have a stock VG248QE to test against. Some online like Mark have mentioned that adjusting the contrast to certain values can alleviate some of the ghosting on the Asus VG278HE model that undoubtedly has the same panel as the XL2720T. I did not find this the case with the BenQ. The ghosting was at all contrast levels, and straying too far from the middle mark in either direction negatively affected image quality.

After playing some games on all three monitor's, I have decided that the image quality increase on the BenQ XL2720T was worth the trade-off with the ghosting. This came in no small part to the ghosting only happening on light colored images, and the ghosting was actually sometimes less apparent than the 24" models on dark images. In no small part to the XL2720T being 27", which will allow me to push the 3x portrait setup further back on my desk. This will allow a U2413 IPS panel to swing in front of it an a monitor arm for web surfing as it has zero-PWM, great picture quality and a wonderful "semi-gloss" AR film.

One thing to note is ghosting is actually different across the top to the bottom on the 24" panels. This is a strange phenomenon I found out once I rotated all three monitors to portrait. The XL2720T ghosting stayed the same. Pretty universal across the screen. The center of the 24" models still has zero ghosting, but at the very sides "top and bottom in landscape", ghosting similar to the normal Xl2720T's appeared. Since the ghosting was no longer universally better in portrait mode, that also had me lean towards the better picture quality of the big BenQ.

To recap:

My 3x XL2420TE's are going back. I'd only recommend this monitor if you don't want Lightboost and are sensitive to PWM Flicker.

The Asus VG248QE is still the best value at a current pricing of $250. This is some half the cost of the XL2720T.

I have a Asus VG278HE arriving tomorrow to pit against the XL2720T. The victor will end up as my 3x 120 Hz portrait Lightboost setup replacement. Stay tuned!
Edited by CallsignVega - 7/18/13 at 11:57pm
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post #1294 of 2929
Wow ! great work, nuff said thumb.gif thanks !
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post #1295 of 2929
Thank you for this review thumb.gif +REP
Edited by trhead - 7/19/13 at 3:37am
post #1296 of 2929
Thread Starter 
Vega, thanks for torture testing the Test UFO!

Here are the web-based motion test that Vega used in his review:

Marquee ............. www.testufo.com/#test=framerates-marquee
Scrolling Text ...... www.testufo.com/#test=framerates-text
Ghosting ............. www.testufo.com/#test=ghosting
Eiffel Tower ......... www.testufo.com/#test=photo&photo=photo-eiffel.jpg
Chase Test .......... www.testufo.com/#test=chase

Google Chrome browser is preferred as it does 120fps@120Hz, or use a recent VSYNC-supported web browser. Make sure you enable/disable LightBoost during these tests, to see the improvement LightBoost gives. If you have ToastyX Strobelight installed (with multiple refresh rates in strobelight setup), use Ctrl+Alt+Plus and Ctrl-Alt+Minus to turn ON/OFF LightBoost. Even while the web page is running.
post #1297 of 2929
Great comparison vega!
post #1298 of 2929
It might be because ActualMultipleMonitors does not like Google Chrome, but that UFO test does not work at all for me.
post #1299 of 2929
Thread Starter 
Quote:
Originally Posted by Art Vanelay View Post

It might be because ActualMultipleMonitors does not like Google Chrome, but that UFO test does not work at all.
Art, thank you for beta testing www.testufo.com. To help me improve Test UFO:

Did you mean Chrome does not work at all, or Chrome is running very stuttery? Chrome is usually great, but it has been known to do quite a lot of stutters sometimes.

(1) In Chrome, can you type "chrome://gpu" in the address bar, and send me info to mark[at]blurbusters.com or by PM?
(2) In Chrome, can you run http://www.testufo.com/#test=animation-time-graph and email me a screenshot of that to mark[at]blurbusters.com ?
(3) Can you try out FireFox 24+ pre-beta; it seems to work well on the multimonitor setups that Chrome seems to dislike.
Edited by mdrejhon - 7/19/13 at 5:12pm
post #1300 of 2929
Quote:
Originally Posted by mdrejhon View Post

Art, thank you for beta testing the UFO test. To help me improve Test UFO:

Did you mean Chrome does not work at all, or Chrome is running very stuttery? Chrome is usually great, but it has been known to do quite a lot of stutters sometimes.

(1) In Chrome, can you type "chrome://gpu" in the address bar, and send me info to mark[at]blurbusters.com or by PM?
(2) In Chrome, can you run http://www.testufo.com/#test=animation-time-graph and email me a screenshot of that to mark[at]blurbusters.com ?
(3) Can you try out FireFox 24+ pre-beta; it seems to work well on the multimonitor setups that Chrome seems to dislike.
I plugged the second display into my graphics card, instead of the IGPU, and it actually runs now.

Actual Multiple Monitors and Chrome may actually not hate each other.

Chrome doesn't seem to like having windows open on two monitor, though. The test doesn't run at the correct frame rate, if I have chrome open on both monitors.
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