Designed for gaming use, the BenQ puts a lot of weight into its 120 Hz refresh rate. If you haven’t used a 120 Hz display before, you really need to do it in person to see the extra fluidity that it offers in comparison to 60 Hz. It isn’t something that can be captured in video, since it would be seen on a 60 Hz display, but in person it’s impossible to miss. Simple things like a mouse cursor or dragging a window are much more fluid. Playing games, animations and movement are much more fluid than with 60 Hz, and the change is almost instant to notice. Even myself, who is a casual gamer at best, can notice the difference that it makes in fluidity.

The downsides here are that all 120 Hz monitors seem to currently be limited to 1080p resolution, though some people are overdriving their import 27” IPS LCDs to do 120 Hz as well. Moving to 120 Hz at a higher resolution would also require a much more expensive graphics card, so I can understand the focus on 1080p because of that, but it also makes the monitor not as nice for general work as a higher resolution display is now.

As far as the gaming modes and the quick keys, what these modes are really doing is radically altering the gamma, going from the 2.2 that we might generally want to something closer to 1.4 in my measurements. This brings out things that might be hidden in the shadows, but in doing so it also destroys all the shadow detail and leads to a very washed out, flat looking image that isn’t attractive at all. It might offer you a bit of a performance advantage by seeing more things and not missing someone that is hidden away, but it isn’t nearly as enjoyable to look at in normal use. Perhaps if I was playing in a competitive game against someone I would utilize them, but for solo play I’m almost certain to go back to the calibrated settings, as I far and away prefer the higher contrast ratios and visual pop that it offers.

Update: Lightboost

As many people pointed out in the comments, you can use Lightboost, and some trickery, to get the XL2720T to display at 120 Hz with a strobing backlight. Working much more like a CRT, where you have black frames between objects and not object permenance on the screen, this should provide for better motion resolution and a more CRT-like feel. After I was made aware of this (it's not in the documentation with the monitor, or mentioned by BenQ, or really officially supported) and hooked the XL2720T back up and tested it in this mode.

One thing this does do it lock out all the picture controls except color and brightness. You also take a significant hit to light output in this mode. Motion does look smoother, that I can say for sure. However the extra flickering that this backlight causes also gives me a bit of a headache. I went away from CRTs to LCDs a decade ago because the flicker caused more eye-strain for me, and with the BenQ it seems to bring that feeling back. Games were smoother than before, with a noticeable difference in motion resolution, but it wasn't perfect. Losing all adjustments and the light output is a downside as well.

I also ran the numbers on the display with Lightboost enabled. As all of the controls except for Contrast are really locked off from you, then you need to rely on a video card LUT to calibrate and get anything remotely close to accurate. I also found the maximum contrast level I could drive was 48 without having severe clipping of whites. At this setting your maximum light output is 129 cd/m2. With the contrast at maximum I got 140 cd/m2 but also severe highlight clipping and color distortions.

Lightboost also causes a severe blue-shift in the image. I mean an extreme shift in the image. If you've read our display reviews, you'll know that 6503K is the ideal color temperature (CCT). Lower than that is reddish and higher is bluish. Sometimes we see a display come in around 10,000-12,000K, but that's very high. With Lightboost enabled, the BenQ has an average CCT of 36,025K. It is very, very blue. Here's a table with the data for the BenQ with Lightboost enabled, and after calibration with Lightboost on.

  Lightboost Default Lightboost Calibrated
Average CCT 36025K 6541K
Grayscale dE2000 19.8149 0.9748
Contrast Ratio 779:1 718:1
Peak Light Output 129.1 cd/m2 103.6 cd/m2
Gamma (2.2 target) 1.29 2.15
Color Points dE2000 10.6246 1.5229
Gretag Macbeth dE2000 16.7849 1.7451

So if you calibrate it, you can get a decent image with Lightboost enabled, but you also have to trade your contrast ratio and peak light output for it. It has to reduce Blue all through the video cart LUT to remove that horrible color cast on the image, and doing that drops the light output. At the default settings, the color tint is extreme and while you might be OK with it for gaming, for any daily use even those unconcerned with a calibration might find it to be way too blue for their liking. Post calibration it looks fine, though. All of the Pre- and Post-calibration charts are in the gallery below.

I wish they would make this a normal choice to use the monitor in, and not hidden away and requiring research and work. If motion resolution is the most important aspect to you, then you'll want to at least test out Lightboost mode on the XL2720T. Just know it does entail a few trade-offs as well.

For lag testing, I’ve settled on using the Leo Bodnar lag tester for reviews. Talking to other reviewers with it, our data indicates consistent results with everything except plasma TVs at this point, and that’s not an issue for PC monitors. It means I can only test 1080p60 over HDMI or DVI inputs, but that is similar to the limitations that SMTT introduced. It also lets me measure across the screen at three points and provide different data that I can then average to an overall lag number. The BenQ measures out at 22.1 ms of lag using the Leo Bodnar test. Using the FPS mode or the regular mode led to the exact same scores, so that didn’t influence it at all. I didn’t notice any perceptible lag in use, but that number is higher than I expected it to be.

Processing Lag Comparison (By FPS)

Brightness, Contrast and Power Use Conclusions
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79 Comments

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  • metril - Monday, June 17, 2013 - link

    Now that others have pointed out, I see the 1080p tag. I agree that a table would have been beneficial. I guess, I'm so used to see tables like in the other reviews that I've come to expect one in any review. It provides a quick overview before I go and read the review. Nonetheless, thanks for the review. :) Reply
  • brucek2 - Monday, June 17, 2013 - link

    The list of tags right under the article's title includes "1080p", and then there's the discussion on the next to last page how all current 120hz monitors are 1080.

    Of course the table is a good idea. I feel like there usually is one? Maybe something got lost in the editorial pipeline?
    Reply
  • thwaak - Monday, June 17, 2013 - link

    I agree, this was a major oversight. I had to skim the article till the second last page to determine that it was 1080p, and even then it's really not even directly stated. Reply
  • Rob94hawk - Monday, June 17, 2013 - link

    Yeah had to read it a few times to figure out what the resolutions was. Reply
  • r3loaded - Monday, June 17, 2013 - link

    Are there any 120Hz IPS monitors? I'm sure many people would want one. Reply
  • jackstar7 - Monday, June 17, 2013 - link

    Overlord is one of the places you can get the closest thing to 120Hz IPS (at 1440p). Takes some gfx horsepower, but is worth it. Reply
  • Rob94hawk - Monday, June 17, 2013 - link

    No offense but 2560x1440, 2560x1600 gaming is where it's at. Reviewing a 1080p monitor is like reviewing socket 775 all over again. Reply
  • birru - Monday, June 17, 2013 - link

    That's a complete exaggeration. High resolution gaming is awesome, and there's real value there, but 1080p is absolutely relevant. Especially when you factor in trying to maintain 120fps or 144fps to keep up with these high refresh LCDs while avoiding tearing. Even with my GTX 780 I've found that with some recent titles I have to scale back the eye candy a touch to keep the experience at a solid 60fps. And that's at 1080p. So with a top of the line single GPU you'd certainly have to reduce visual fidelity a bit more at higher resolutions. And of course it gets worse with triple screens if you want to go that route. 3x1080p is feasible with one GPU. 3x1440p and you're looking at SLI or Crossfire.

    Resolution costs money; how sharp do you want to go?
    Reply
  • sxr7171 - Monday, June 17, 2013 - link

    Same issue here. 780GTX and I need to turn settings down in Crysis 3. This is at 1080p. Can't imagine how that would work out at 1600p. I guess SLI is a must with those resolutions along with all the problems. Reply
  • brucek2 - Monday, June 17, 2013 - link

    Per Steam, 1080p and under is something like 98%+ of all gamers (and this is billed as a "gaming monitor" review.)

    Sure I'd expect that the percent of newly purchased monitors may be somewhat higher, but I bet it's still well south of 10%.
    Reply

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