Asus ROG Swift PG27UCDM 4K 240 Hz QD-OLED gaming monitor review: High-end in every way

27-inch 4K QD-OLED gaming monitor with 240 Hz, Adaptive-Sync, HDR10, and wide gamut color.

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Asus ROG Swift PG27UCDM
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The PG27UCDM is my first look at a 27-inch 4K OLED. The other screens in the group are 32-inches but all run up to 240 Hz. They are Asus’ PG32UCDP, Aorus’ FO32U2P, Acer’s X32 X3, Dough’s Spectrum Black 32, and HP’s Omen 32 OLED.

Pixel Response and Input Lag

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Asus ROG Swift PG27UCDM
(Image credit: Tom's Hardware)

240 Hz OLEDs, regardless of pixel count or density, refresh the screen in 4ms. They are on equal footing regarding motion blur, of which there is none. The PG27UCDM includes ELMB (black frame insertion) for lower speeds up to 120 Hz. But no extra processing is required for blur-free operation over 150fps.

In the lag test, the PG27UCDM proved to be the fastest 4K OLED I’ve yet tested, tied with the HP Omen 32 OLED at 18ms. This is very quick but there are a few QHD screens that are faster. The overall record still belongs to the 360 Hz Philips 27M2N8500 at 10ms. The PG27UCDM is more than fast enough for any gamer though, even at the pro level. Its smoothness is a definite asset in competition.

Test Takeaway: The PG27UCDM delivers the same blur-free operation as any OLED running over 150 Hz. It has less input lag than all other 4K OLEDs except the HP Omen 32 OLED, which it tied in my test. It adds flexibility with ELMB up to 120 Hz which makes it better suited for slower PCs. If you have the processing power, it is on equal footing with the very best and provides an addictive gaming experience.

Asus ROG Swift PG27UCDM

(Image credit: Tom's Hardware)

Viewing Angles

The PG27UCDM has perfect viewing angles, meaning there is no visible color or brightness shift at 45 degrees to the sides. Some QD-OLEDS show a slight warmth, but Asus is using the latest panel part here, which does not have that artifact. The top view is a bit red with lighter gamma. This is excellent performance.

Screen Uniformity

To learn how we measure screen uniformity, click here.

Asus ROG Swift PG27UCDM

(Image credit: Tom's Hardware)

OLEDs are consistently solid in my uniformity test, and the PG27UCDM is one of the better panels I’ve seen. That is as it should be for a $1,200 monitor. With just 5.01% measured deviation, it has no visible hot spots or other anomalies. All field patterns are perfectly uniform from edge to edge.

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Christian Eberle
Christian Eberle
Contributing Editor

Christian Eberle is a Contributing Editor for Tom's Hardware US. He's a veteran reviewer of A/V equipment, specializing in monitors. Christian began his obsession with tech when he built his first PC in 1991, a 286 running DOS 3.0 at a blazing 12MHz. In 2006, he undertook training from the Imaging Science Foundation in video calibration and testing and thus started a passion for precise imaging that persists to this day. He is also a professional musician with a degree from the New England Conservatory as a classical bassoonist which he used to good effect as a performer with the West Point Army Band from 1987 to 2013. He enjoys watching movies and listening to high-end audio in his custom-built home theater and can be seen riding trails near his home on a race-ready ICE VTX recumbent trike. Christian enjoys the endless summer in Florida where he lives with his wife and Chihuahua and plays with orchestras around the state.