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ASUS PQ321Q 31.5-Inch 4K UHD 16:9 LED LCD Monitor (Black)

3.8 out of 5 stars 59 customer reviews
| 49 answered questions

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  • 31.5-inch 4K display with ultra-high definition (UHD) 3840 x 2160 resolution and 140 pixels per inch (PPI) for impeccable visuals
  • Ergonomically-designed stand with Tilt,Swivel,Pivot,Height adjustment plus wall-mount capability for comfortable viewing position
  • The thinnest 4K monitor available, the PQ321Q is wall-mountable with full tilt, swivel, and height adjustment
  • DisplayPort and dual HDMI ports, Picture-by-Picture function, and built-in dual 2-watt stereo speakers
  • ASUS Rapid Replacement: 3 Years Warranty, 2 way free shipping
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Product Description

Product Description

The 31.5-Inch ASUS PQ321Q True 4K UHD Monitor provides stunning visuals with an ultra-high definition 3840 x 2160 resolution-four times the detail of Full HD. With over 8 million pixels, experience larger screen real estate and clarity you have to see to believe.


An Experience Only 4K can Deliver. The 31.5-inch ASUS PQ321Q True 4K UHD Monitor provides stunning visuals with an ultra-high definition 3840 x 2160 resolution—four times the detail of Full HD. With over 8 million pixels, experience larger screen real estate and another level of clarity in your movies, videos, and games you have to see to believe.


Over 8 million pixels
Over 8 million pixels

By doubling the number of horizontal and vertical pixels, the PQ321Q True 4K UHD monitor gives you every bit of detail, far surpassing that of a Full HD monitor. With four times the resolution of Full HD and over 8 million pixels, experience larger screen real estate and clarity you have to see to believe.

10-bit color for smoother gradations
10-bit color for smoother gradations

The ASUS PQ321Q True 4K UHD monitor is a 10-bit RGB panels that delivers more natural transitions between different hues and offers a more flawless image than ever before.

Premium IGZO Display
Premium IGZO Display

The ASUS PQ321Q True 4K UHD Monitor is built with an anti-glare Indium Gallium Zinc Oxide (IGZO) panel rather than traditional amorphous silicon. The IGZO panel supports much smaller transistors than amorphous silicon, which allows for much smaller pixels and much better detail. Couple with an ultra-wide 176-degree viewing angles on both vertical and horizontal planes, get a pristine image from virtually any angle. What’s more, the IGZO panel supports increased pixel transparency and reduced current leakage for increased energy savings.

Extensive Connectivity
Extensive Connectivity

The ASUS PQ321Q True 4K UHD Monitor features DisplayPort and dual-HDMI ports inputs to connect to your various devices and PCs simultaneously. Built-in 2W stereo speakers simplify frees space from needing separate speakers for a complete audio visual experience.

Picture-by-picture (PIP) mode splits the screen down the middle to display content from two separate sources side-by-side to view images from different signals and easily switch between the main and PIP source, including audio.

Slim Profile with Ergonomic Design
Slim Profile with Ergonomic Design

The thinnest 4K monitor available, the ASUS PQ321Q True 4K UHD monitor measure only 35mm at its thickest point, showcasing a modern design fit for anywhere in the home or office.

Pixel-perfect Coverage
Pixel-perfect Coverage

The PQ321Q comes with a 3 year global warranty as well as aZero Bright Dot guarantee that ensures full replacement if there’s so much as 1 bright dot pixel. Plus, ASUS Rapid Replacement provides fast and free replacement in no time at all*.

What's in the Box


  • PQ321Q True 4K UHD Monitor
  • AC adapter
  • Power cable
  • DispayPort 1.2 cable
  • RS-232C conversion cable
  • Warranty Card


Display Size: 31.5 inches 16:9
Display Type:
IGZO LED backlit
Display Colors:
1.07 billion (10-bit RGB)
True Resolution:
3840 x 2160
Pixel Pitch: 0.182 mm (140ppi)
Viewing Angles:
176-degrees (H) / 176-degrees (V)
Brightness:  350 cd/m2  
Response Time: 8ms (Gray to Gray)
Color Temperature: 18 levels
Gamma Adjustment: 5 modes
Inputs/ Outputs:

1 x DisplayPort

2 x HDMI 1.4

1 x RS-232C

1 x 3.5mm audio-in

1 x 3.5mm audio-out

Mechanical Design:

Tilt (+25° ~5°)

Swivel (+45°~ -5°)

Height adjustment (0~ 150mm)

VESA wall-mountable (200 x 200mm)

Size: 750 x 489 x 256mm / 29.5 x 19.3 x 10.1-inches (with stand)
Weight  13kg / 28.7 lbs

© 2013 ASUS Computer International. All Rights Reserved. ASUS is a registered trademark of ASUSTeK Computer. All specifications are subject to change without notice and features are only in select models. Products may not be available in all markets. Brand and product names mentioned are trademarks of their respective companies.

* ASUSTeK will provide warranty coverage without charge if the purchased product is proven defective and workmanship under normal use within the warranty period, from the date of purchase from ASUSTeK or its authorized reseller. This limited warranty applies only to the original consumer purchaser and is effective only within three years (for the standard warranty) and 30 day (for the Zero Bright Dot warranty) from date of purchase. ASUS Rapid Replacement covers 2-way free shipping for US and Canada regions only.

Product Information

Technical Details

Collapse all
Summary : Screen Size, Screen Resolution, Graphics Coprocessor, Graphics Card RAM
Screen Size 80.1 centimeters
Max Screen Resolution 3840 x 2160
Brand Name Asus
Item model number PQ321Q
Item Weight 37.7 pounds
Product Dimensions 9.1 x 21.6 x 39 inches
Item Dimensions L x W x H 9.06 x 21.65 x 38.98 inches
Color black

Additional Information

Customer Reviews
3.8 out of 5 stars 59 customer reviews

3.8 out of 5 stars
Best Sellers Rank #17,179 in Computers & Accessories (See top 100)
#1,222 in Computers & Accessories > Monitors
Shipping Weight 38 pounds
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available July 1, 2013

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Product Warranty: For warranty information about this product, please click here


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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

The manufacturer commented on the review below
By D. Birns on August 12, 2013
Verified Purchase
Wanted to throw my name into the ring as well as a new owner of the PQ321 who is insanely happy with my purchase. With scaling set to 100% (I don't mind the small fonts) I've massively expanded my available desktop space, and as a programmer who usually has 3 or 4 different applications open at once, it has greatly increased my productivity, and I've only had it for a few hours! Installation was easy (note: using Windows 8.1 preview, I hear it adds DPI functionality, so I don't know if it'd be so seamless under normal 8), thankfully my Radeon came with a mini display port to display port converter or else I'd have been really pissed not being able to use it day one! I used eyefinity to make it a single display @60hz (after turning on MST using the PQ's menu). One thing that stumped me for a few minutes, no sound after eyefinity'ing it - solution was simple, make sure you select monitor 1 as the default sound output device under playback devices! I haven't tried any games yet so can't comment, but as far as productivity goes, happy as can be.

1 Day Later:
Burned out pixel :( , will let you know how their zero bright dot policy and 2 way shipping works out.
6 Comments 80 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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The manufacturer commented on this review(What's this?)
August 19, 2013
Dear D. Birns,

We are glad you've made the right choice in selecting this model as this is the thinnest 4K monitor available on the market today. We value your feedback and I'm willing to take the opportunity to try and correct any monitor issue you may experience with your new unit. I also encourage you to reach out to us, the ASUS Customer Loyalty Team, should you have any other ASUS product-related inquiries. My email is cl-celeste@asus.com. Please include this unique case#2888494 in the subject line.

ASUS Customer Loyalty
One of the new 4K Computer monitors out there to use Sharps 31.5" IGZO display, and bring 4K to the desktop.

That all sounds very promising, but this thing comes set up like its a cheap TV competing for your attention in Walmart. Let me give some of the many examples:

The PQ321Q requires being reset to standard resolution, not 'Wide' displays - nobody wants their Photoshop images 'stretched': Screen Size > Normal (not 'Wide')

They need the brightness to be set at 120-140 cdm, not eye peeling 350cdm maximum: Picture > Brightness, turn it down from 30 to about 8 on my model

We need to work with the monitors native gamut, not 'Vivid' or sRGB, but the full native color space that can be accurately calibrated by a calibrator puck: Color> Standard, not Vivid, not sRGB (unless you are purely a web designer)

White Balance will be set by your calibration routine, not a preset: Color> White Balance > Thru (for PC use)

Gamma should be 2.2 for most people, it's set way to high as delivered: Color> Gamma> 2.2

All of these are set wrongly by the factory, it is kind of shocking what they think 'Default' should be. When you get it running out of the box, it seems dreadful, like its trying to compete on a BestBuy TV wall. Adjusting nearly every setting down to standard workstation monitor settings, like those above, improves a *lot*. Proper profiling improves it even more. A 10bit pipeline (like in ATI FirePro cards) to this 10 bit monitor, even better! Basically, Asus need to provide the option of Gaming Default or Graphic Pro defaults, at first startup. They are completely different in their needs.
Read more ›
12 Comments 170 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Verified Purchase
I just took the plunge and got the Asus PQ321Q, in large part because Apple has certified that it is capable of 60 hz on the Mac Pro (Late 2013) when using this display. See Apple's support page. People have been repeating this all over the internet.

Apple says: "Mac Pro (Late 2013) also support 60 Hz displays using multi-stream transport (MST). These displays need to be manually configured to use MST. Follow the steps below to use the display's built-in controls to enable this feature.

ASUS PQ321Q: Choose OSD menu > Setup > DisplayPort Stream

Your Mac will automatically detect an MST-enabled display."

Well, I got the display and set it up on my nMP with dual D500s. Its connected to my nMP using a display port to minidisplayport cable. [...]

As soon as I turn on MST, the screen goes black. I have to turn off MST to get it working. I finally talked to Asus support. The support rep made me wait while he talked to a supervisor, and then he swore that it simply isn't possible. Here is part of our discussion:

Shahid Haque-Hausrath Fri, 7/11/2014 05:07:18 pm
Can you tell me what kind of cable I can use to connect a Mac Pro (newest model, only has mini display port) to the monitor, and get 60hz? Because this is absolutely supposed to be possible.

Cordell S. Fri, 7/11/2014 05:07:47 pm
you will not be able to get 60hz when using that mac as the output on the mac is mini display port. it would have to be coming from a full display port connection that your mac does not have.
and who told you that?

Shahid Haque-Hausrath Fri, 7/11/2014 05:08:11 pm
Apple. [...]
I don't get how what Apple says can jive with what you said about mini display port not working. The Mac Pro only has mini display port.
Read more ›
2 Comments 29 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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I got this monitor the first day available on July 17 and it has worked perfectly. Easy to set up and capable of 60 hz, single cable, max resolution single screen output. Multiple screen output is also available(Enter monitor setup and select MST instead of default SST otherwise only 30 hz is available). After being used to a Dell 1920*1200 monitor I have to increase the text size by 50% since the text size is so small. Sharpness, color richness and detail are significantly improved over typical HD(1920*1080) monitors. Played some 5 year old action games which allowed for 3840*2160 resolution and even at max detail level there wasn't any noticable lag. I bought a fast new video card(Radeon 7950) to drive this monitor and comes with a display port output.

I viewed some 4k videos on Youtube. These are videos filmed in 3840*2160+ resolution and can be 500 mb for only 3 minutes, instead of less than 50 mb for typical HD. These 4k videos are breathtaking on this monitor and really show off the color richness and detail. They look 3d in the sense that I cannot distinguish the quality difference between this and real life. While 4k movies are still scarce, you will be in for a real treat when watching any 4k content on this monitor!

Is this worth $3500? If screen real estate is very important to you, or money is not an issue then definitely yes go out and buy this monitor!

My only complaint is the users manual is a complete joke and ASUS technical support is not well versed with this monitor as they don't even have one to use.
3 Comments 28 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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