ASUS PQ321 Ultra HD 4K 31.5-inch Monitor Review

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We have a confession to make (well, several actually, but all the rest date back to our college days, and some secrets are best left untold). Reviewing monitors isn't as fun as it once was. It's not that we've grown jaded over the years, but plain and simple, the monitor market has become stale, lacking the kind of 'gee-whiz' innovations that tend to excite us. Panel makers seemed to stopped pushing the envelope once they developed 30-inch In-Plane Switching (IPS) screens, and for the longest time, that's where the high-end has sector been stuck, as if caught in quicksand with no rope in sight, or so we thought.

Out of all the monitor manufacturers out there, it was ASUS that showed up to the panel party with rope in hand, marching through the muck and mire tugging the first consumer 4K display ahead of the competition. And for adding bragging rights, the ASUS PQ321 True 4K Ultra HD measures a just a little bit bigger than current flagship models with a 31.5-inch LED backlit panel, giving monitor enthusiasts yet another reason to upgrade.

Not that the PQ321 is lacking a sales pitch. Boasting a 3840x2160 display resolution, this 4K display floods your eyeballs without four times as many pixels as that of a standard Full HD 1080p (1920x1080) display. To squeeze that many pixels into a 31.5-inch form factor, the PQ321 uses what's called Indium Gallium Zinc Oxide (IGZO) rather than traditional amorphous silicon for the active layer of its LCD panel. IGZO supports much smaller transistors, which in turn paves the way for greater pixel density (and other benefits).

ASUS PQ321 - world's first consumer 4K monitor

So, what can you do with over 8 million pixels at your disposal? Put simply, you can do everything with the PQ321 that you can on lower resolution monitors, only with more detail and a larger workspace, depending on the application. There are some downsides to current 4K technology though -- the refresh rate is capped at 60Hz and it can be a little tricky to setup/configure -- but there is also plenty of upside, especially for professional photographers and graphic artists who demand a high level of detail. We'll cover both ends of the spectrum, but before we do that, let's have a look at the spec sheet.

ASUS 31.5-inch PQ321 4K Ultra HD Monitor
Specifications & Features
Display Size
31.5-inch IGZO
3840 x 2160
Aspect Ratio     
350 cd/m2 
Contrast Ratio 
Response Time
8ms (Gray to Gray)
Viewing Angle
176° vertical / 176° horizontal
Display Type
IGZO (Indium Gallium Zinc Oxide)
2 x HDMI; DisplayPort; RS-232C; 3.5mm mini-jack
Power Consumption 
93W (Typical); <6W (Power Saving); <1W (Power Off Mode)
2 x 2W stereo RMS speakers
Tilt (+25 degrees to 5 degrees); Swivel; Height
I/O Ports N/A
Dimensions (with stand)
750 mm x 489 mm x 256 mm (HxWxD) / 29.5 inches x 19.2 inches x 10.1 inches
13 kg / 28.7 lbs
Included Accessories

Cable clamp; power cord; power adapter; DisplayPort cable; Warranty card; RS-232C conversion cable; Setup manual
3 years casing; 3 years panel; 1 year parts and accessories (optional)
Price $3,499 street

There are couple of things in the spec sheet that we'll play close attention to in this review. The response time, for one, is bit higher than we're used to seeing, and the contrast ratio (typical) is a little lower than most panels. At the same time, bear in mind that monitor specs are general guidelines at best. There are different ways to measure a monitor's performance, making it relatively easy for monitor makers to fudge the numbers if they're so inclined, so we don't put a ton of stock in them to begin with.

The elephant in the room is the price. At $3,499 street, the PQ321 carries a premium price tag that was once occupied by 30-inch IPS panels not that long ago (some still hover in that range). Expect 4K monitors to come down in price once they become more commonplace, but for now, there's a premium attached for being an early adopter.

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TravisKenyon one year ago

Sad thing is, this 10.5x better than my monitor, but mines al so just a very old 1024x768 15" flat :P Makes me feel like such a noob.

Tyotukovei one year ago

I love ASUS for their monitors. Their MOBO's are also some of the best out there. Now to read the review.

toughtrasher one year ago

Thank you very much for the review, Dave. I found some similar reviews regarding another ASUS monitor that was compared to a BenQ monitor to see which was the better one for things like gaming. I'll leave the link for those that want to read more on it (

I personally think ASUS monitors are the best. They are designed really well and look sleek with my PC!

realneil one year ago

ASUS make some really good screens. I'd love to have this one, but my 27" ASUS will have to do for now.

MayhemMatthew one year ago

So big :(

I prefer 24 inch sizing myself.

ThomasHensley one year ago

ultra HD or 4k res is wasted in anything less then 50 inches where 1080p shows its limitation (pixels get to big) 4k res can go to 300 inches (via projector) with ease or 120 inches in 3D

redrum123 one year ago

It's very nice and all but for now $3500 is out of my price range!! is it just me or does 35 mm thick seem a lot thicker then the 2 or 3 mm LG 31 inch monitor? i don't get the huge price disparity over my current ASUS IPS display. I think i'll stick with my monitor for now deep colours, great contrast, flawless quality, and strong sturdy industrial look makes me a big ASUS fan for now!

Maciek one year ago

For last 4 years I am using Dell 3007 30" , 2560 x 1600 monitor as a central one plus 2 Dell 2007FPb, 20" 1600 x 1200 monitors as a wings, set at 30 degrees in portrait mode, so they become 1200 x 1600. In this configuration they are perfect mach to the center one giving me total resolution 4960 x 1600. Paid on Ebay $560 for 30" and $90 for 2 used 20" from Craigslist. Just can't imagine being without my setup. It is so convenient be able to move pages aside instead closing them or covering with next page. In the future would like to move my setup to higher resolution when cost will come to more realistic level end more video card supporting ultra definition become available. Love this country for its secondary market and rich people buying expensive staff and selling it later for 10 cents on a dollar, lol.

realneil one year ago

[quote user="Maciek"]Love this country for its secondary market and rich people buying expensive staff and selling it later for 10 cents on a dollar, lol.[/quote]


I love this and I'll buy used and refurbished gear also.


iJOHNO one year ago

$3,500? Let me just sell my kidney. :D

drchaos 11 months ago

A great article on the topic. "4K is for programmers"

"At our office, we just equipped all of the programmers' workstations with Seiki 39" 4K televisions as monitors. At $500 a piece, you should be doing the same."

KevinLozandier 8 months ago

Thanks for sharing that article, drchaos; A 4K monitor (preferably an Asus ProArt model to have the thoughtful grid feature they provide on their monitors) is on my wishlist for a better programming experience.

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