HP ZR2740w Versus Asus PB278Q: QHD 27" Monitors, Tested

Until cutting-edge UHD (3840×2160) displays hit the mainstream, most enthusiasts have to be content with QHD monitors at 2560x1440 pixels. In the lab today, we have two more 27-inch QHD screens: the ZR2740w from HP and the PB278Q from Asus.

It seems that, at least for now, affordable QHD (2560x1440) screens at least 27" large are hot ticket enthusiast items. Given a screen that size, the extra pixel density is more pleasing to the eye than an FHD panel at 1920x1080. With 108 pixels per inch, you probably won’t see any dot structure at the normal two- to three-foot viewing distance.

Although QHD is still at the pricier end of the spectrum, the amount of cash required to obtain a nice-looking 2560x1440 display continues dropping. Don't believe us? Check out Auria EQ276W 27" IPS Monitor Review: QHD For $400. While other brands are still asking $800 or more, a few others are dipping into the $650 range.

We're looking at two such panels today: HP’s ZR2740w and Asus’ PB278Q. Both are IPS-based and boast high-quality fit and finish. Accuracy is a definite selling point, as is brightness. With a fairly steady stream of very nice displays coming through our labs, it’s becoming difficult to go back to anything smaller (or lower-res), and these screens typify why.

HP ZR2740w

HP ships its monitor in one of the largest cartons we’ve ever seen. At least two screens could fit in the heavy corrugated box. The panel and base are kept separate by molded Styrofoam, leaving both extremely well-protected. Shippers would have to make a serious effort to damage this product! Inside the box are DisplayPort and dual-link DVI cables, along with a power cord. The power supply is internal, so there are no external bricks to contend with. Also included is a CD containing the user manual and all necessary software.

The base attaches without tools and is quite substantial. It’s made out of the same high-quality matte-finished plastic as the panel’s bezel. Ergonomic adjustments include height, tilt, swivel, and rotation. You should have no trouble setting this monitor up on any kind of desktop. All of the movements are very smooth, yet each position also feels very solid. If you want to use your own bracket or stand, the HP accepts a 100 mm VESA mount.

The bezel absorbs light extremely well. It measures 22 mm wide on the top and sides and 32 mm wide on the bottom. The image goes right to the edge (as it should) and sits behind a high-clarity anti-glare screen. Light reflections won’t be an issue with the ZR2740w. At the top center is the HP logo embossed in silver. The lower-left corner sports the model number, while the lower-right corner is home to the four control buttons. These also have a nice expensive feel to them. One of the first things you'll notice is that there is no button for the on-screen menu; that’s because the ZR2740w doesn’t have one. The only adjustment available is brightness, which is controlled by the plus and minus keys. The other two keys switch on the power and cycle between input sources.

The inputs face downwards and are clustered near the left side of the panel. DVI and DisplayPort are the only choices. The absence of both VGA and HDMI ports is a clear sign of the business-oriented intent of this product. This means no connecting Blu-ray players or other TV-type sources. A computer is the only way to display an image on the ZR2740w. Rounding out the connectivity suite are two pairs of USB ports, one side-facing and one down facing; and a type-B upstream connector. All three ports are USB 2.0-compatible.

The ZR2740w uses LG’s H-IPS panel as its core technology. This is first-generation IPS tech from 2007, back when IPS panels first came to market. Its main strength is white balance accuracy, thanks to the use of an Advanced True White polarizing film developed by NEC. Despite the age of the tech used here, the benchmark results should demonstrate that significant improvements have been made in contrast and overall color accuracy since H-IPS first appeared on the scene.

Asus PB278Q

Asus’ panel is based on a Samsung PLS part; similar to the one that we recently tested in Samsung’s own S27B970D. The technology is identical to the different flavors of IPS in that the individual sub-pixels are aligned parallel to the screen instead of perpendicular. The packaging is a stout carton sporting a carrying handle, with dense, rigid foam to protect its contents. Inside are DVI, DisplayPort, HDMI, VGA cables, and a standard power cord. Like the HP, Asus’ power supply is internal. Also included is a mini-headphone audio cable for the internal three-watt stereo speakers. For documentation, only a Quick Start Guide and warranty booklet are provided. The full user manual can be downloaded from Asus’ website.

The base screws on without tools and, like the ZR2740w, it is large, solid, and more than up to the task of balancing the nearly 20-pound panel. The vertical support adjusts for height, tilt, and rotation, but not swivel. If you want to use your own bracket or swing arm, the screen accepts 90 mm VESA-compatible hardware. Everything is made from a high-impact matte-finished plastic that looks to be of high quality.

The bezel absorbs light well, measuring 21 mm wide on the top and sides, and just 25 mm on the bottom. The slightly-raised Asus logo is finished in a silver color. To the right are labels for the controls. At first glance, they appear to be touch-sensitive, but there are actually buttons beneath the edge of the panel. Their feel is nice, and they don’t require too much pressure to activate. In addition to menu navigation and power, you can cycle through sources, as well as directly access brightness controls and picture mode options. The screen itself has excellent light rejection quality and displays a sharp, bright image right out-of-the-box.

The input panel faces downwards and includes every type of connection currently available. DVI and DisplayPort are there of course. And the HDMI port is version 1.4-compliant, supporting the monitor’s full native resolution of 2560x1440 pixels. This assumes your video card outputs QHD resolution over HDMI; not all do. For audio, there are mini-headphone input and output jacks. Through these, you're able to hear the signal from both analog and digital audio sources, using either a pair of connected headphones or the panel’s internal speakers. With a full complement of inputs and included cables, the PB278Q provides the most complete package we’ve seen to date.

Street Price
Panel Type
Screen Size
Max Resolution
Aspect Ratio
Response Time (GTG)
12 ms
5 ms
Brightness (cd/m^2)
Yes, 3 W stereo
Refresh Rate
60 Hz
60 Hz
Dimensions w/base
25.4 x 17.3-21.26 x 9.3 in
645 x 439-540 x 236 mm
25.31 x 21.74 x 8.58 in
643 x 552 x 218 mm
Panel Thickness
2.76 in / 70 mm
2.76 in / 70 mm
Three years
Three years

Before getting to the results, let's quickly go over how we test.

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  • KOKing
    I've had one of these HPs at work for a couple of months (replacing an early 24" 1920x1200 IPS), which I've set fairly low), but as this review says, it's not really necessary. I was a little disappointed that, possibly because of the aspect ratio change to 16:9, it doesn't _feel_ like a lot more screen real estate.
  • Immoral Medic
    Add 120hz, THEN it's enthusiast level.
  • bit_user
    Where are all the OLED monitors? They should be cheap and plentiful, by now!
    Useless review, the uniformity on these screens is pathetic, tried three of each, the color temp difference across the screen is over 1000K. Toms has very poor reviewers, only prad.de and overclockers.ru do reliable screen reviews. And btw the U2713HM is regularly on sale for $500 or so, the ZR2740W is now an overpriced relic lacking even an OSD.
  • cangelini
    SIDDHARTH MISHRAUseless review, the uniformity on these screens is pathetic, tried three of each, the color temp difference across the screen is over 1000K. Toms has very poor reviewers, only prad.de and overclockers.ru do reliable screen reviews. And btw the U2713HM is regularly on sale for $500 or so, the ZR2740W is now an overpriced relic lacking even an OSD.

    Screen uniformity is covered on page eight, and low points on both screens are discussed.
  • flong777
    Am I right by saying that the Asus monitor has more accurate color and better grayscale performance.
  • Marcus52
    Surprised that the Asus has slightly better lag results, as one of the reasons for not having an OSD is to reduce lag, and it can make a big difference. Of course, how you measure lag can get different results, and I've seen much lower numbers for the ZR2740w:


    tftcentral is showing the HP as having far less lag than the Asus panel.
  • ceberle
    The Asus certainly calibrates better than the HP; mainly because it can be calibrated. The HP is slightly better out of the box for grayscale and its chromaticity is also a touch better. Both screens have identical color to the eye. Only the instruments can tell the difference.

  • ceberle
    Regarding the lag results: It's hard to compare numbers from one review to another when the testing methods are so different. With our high-speed camera procedure, the only fair comparison is between the monitors we've tested. I would defend our response test as definitive though. Actually watching the screen draw in slow motion leaves no room for interpretation. The lag test is also consistent since we use the same signal chain for every screen. There is never a change in video cards, drivers, peripherals or any other device that might affect the result.

  • dgingeri
    I have the HP ZR2740w, and have for over a year now. It's a great looking monitor, and it performas well by my standards, but suffers from a significant lack of both reliability and support. HP's support is massively fragmented. It took me over three hours on the phone to get to the department that actually handled the support for this monitor. (It is a "Commercial" monitor, not business or personal. It's splitting hairs mighty thin, but that's the way HP's support is separated out.) When I finally got through, they sent a tech with a replacement monitor the next day. However, it also has two major hardware issues that render it useless when they occur. Most of the first run monitors had the power supplies die within months. The second run monitors had a serious issue with the control boards. All of them have issues with the USB hub, but it least the monitor keeps working if you don't have the USB cable plugged in. As an owner of one, I would not, under any circumstances, recommend this monitor to anyone.

    HP: the perfect example of a company falling apart because it is both too big and too fragmented.
  • ubercake
    Does anyone know how absolute input lag of the IPS monitors compares with that of higher end TN-panel monitors?
  • maxinexus
    Who cares about 1440p...where are the 4k gee how long does it going to take!!!
  • sempifi99
    I have had this HP monitor for about 2 years now. It is a good and solid monitor. It turns on in a matter of seconds and the 12 ms response time is not a problem at all. Though I do wish it was a bit quicker, but you can not have everything at this price point. Also, there is software calibration to adjust the color output so the lack of monitor adjustment did not bother me at all.

    What I don't understand is the difference of input lag compared to other reviews. The Acer has been measured at 16.6 ms while the HP is an amazing 3.6 ms with a CRT being used as the zero set point. I am not sure the exact toms hardware testing methodology but it seems to synthetic, not representing real world performance.
  • ceberle
    The testing procedure is explained in the review. We shoot video at 1000 fps of a black to white screen draw. Then we simply count the number of frames it takes for the white field to fill the screen. The input lag is measured the same way. The video shows the pattern generator's lights flashing when the signal is sent to the monitor. We count the frames between the flash and the full rendering of the pattern to arrive at the input lag measurement. We do this five times and average the results.
  • Nintendo Maniac 64
    So I guess I'm the only one interested in a monitor's upscaling quality? I mean, we don't always play the latest AAA games - I myself like to play some Touhou from time to time, but it's locked to a 640x480 window which is pretty tiny on a high-res display. That leaves you with fullscreen which puts you at the mercy of your monitor's and/or GPU's upscaling ability.
  • Anonymous
    Hp when oh when are you going to make a 30 inch 2560 x 1600 led or oled display or better yet a 4K ready version at 30 inches or better??
  • Spooderman
    Considering the cost of such a panel, probably not for the next 5 or so years.
    soldier2013Hp when oh when are you going to make a 30 inch 2560 x 1600 led or oled display or better yet a 4K ready version at 30 inches or better??
  • mczak1
    No workaround for other resolutions? Seriously? Last time I checked gpus had output scalers (since about 15 years or so...). Maybe you need to activate it manually if the driver can't figure out the monitor can do scaling on its own but pretty sure it should work...
  • agnickolov
    With UHD (Ultra HD, 4K, or 2160p) just around the corner, QHD represents the highest pixel count that you can put on your desktop right now.

    Technically, there's also 2880x1800, but it's only on iMac-s so far. Still, the panels exist...
  • MasterMace
    1440 and 1600p are now old. 2160p is where it's at :)