42 facts in comparison
ASUS ROG Swift OLED PG27UCDM vs KOORUI S2741LM
Two 27-inch 4K monitors that reach good HDR by completely different routes: one lights every pixel individually, the other divides an LCD backlight into over a thousand zones.
The OLED wins response time and contrast outright. The Mini-LED wins peak brightness and costs far less, and nothing about it can wear unevenly over years of static desktop use. Which matters more depends almost entirely on how bright your room is and what sits on screen all day.
Where the ASUS ROG Swift OLED PG27UCDM beats the KOORUI S2741LM
- OLED Panel type ?OLED vs IPS
- A much higher refresh rate ?240 Hz vs 160 Hz
- A much faster response time ?0.03 ms vs 1 ms
- Slightly wider DCI-P3 colour coverage ?99 % vs 98 %
- True Black 400 HDR ?True Black 400 vs DisplayHDR 1000
- A slightly higher pixel density ?166 ppi vs 163 ppi
- G-Sync Compatible Adaptive sync ?G-Sync Compatible vs FreeSync
Where the KOORUI S2741LM beats the ASUS ROG Swift OLED PG27UCDM
- Higher peak brightness ?1,400 nits vs 1,000 nits
- Has local dimming ?
Key real-world differences
The spec sheet pulls in both directions. These are the gaps big enough to shape the decision — with the actual figures, and what each one means in real-world use.
- Response timePicture0.03 ms vs 1 ms — 97% less for the ASUS ROG Swift OLED PG27UCDM
Grey-to-grey response; lower reduces motion blur.
- Local dimmingPictureNo vs Yes — only the KOORUI S2741LM has it
Dims parts of the backlight independently to improve contrast.
- Adaptive syncGamingG-Sync Compatible vs FreeSync — advantage ASUS ROG Swift OLED PG27UCDM
Variable-refresh technology for tear-free motion.
Which one should you buy?
There is no single answer — it depends on what you will actually use it for. Match your priority to the pick below.
- Best for picture ASUS ROG Swift OLED PG27UCDM takes the category 87 to 49 — driven by response time (0.03 ms vs 1 ms).
- Best for gaming ASUS ROG Swift OLED PG27UCDM takes the category 100 to 45 — driven by adaptive sync (G-Sync Compatible vs FreeSync).
- Best for features ASUS ROG Swift OLED PG27UCDM takes the category 100 to 0.
- The safe all-rounder ASUS ROG Swift OLED PG27UCDM wins more of the categories that carry real weight, topping the overall VS Score at 92.
Where each one falls short
ASUS ROG Swift OLED PG27UCDM
- Local dimming: No vs Yes
- Peak brightness: 1,000 nits vs 1,400 nits
- 4 specs are unreported (shown as Unknown) and excluded from its scores.
KOORUI S2741LM
- Response time: 0.03 ms vs 1 ms
- Refresh rate: 240 Hz vs 160 Hz
- Adaptive sync: G-Sync Compatible vs FreeSync
- 11 specs are unreported (shown as Unknown) and excluded from its scores.
What matters to you?
Drag the sliders to weight each category and re-rank the products to suit your priorities.
Score breakdown
Picture
Larger screens are more immersive; measured diagonally.
The total pixel count; higher is sharper.
The panel technology; OLED offers the best contrast.
The more specific panel or backlight technology (e.g. QD-OLED, WOLED or Mini-LED VA).
The native or supported bit depth used to reproduce colour gradients.
The display surface treatment and its balance of glare control and image clarity.
Higher refresh rates are smoother for gaming and scrolling.
Grey-to-grey response; lower reduces motion blur.
Higher brightness makes HDR highlights pop.
The ratio between the brightest and darkest output.
Wider colour gamut for more vivid, accurate colour.
Full sRGB coverage keeps everyday content and photos colour-accurate.
The certified HDR tier.
Pixels per inch; higher looks sharper.
Dims parts of the backlight independently to improve contrast.
More independently controlled zones can improve HDR precision.
Gaming
Variable-refresh technology for tear-free motion.
Syncs the refresh rate to the GPU.
Backlight strobing for clearer motion.
The delay between an input and the image changing; lower is better.
The minimum-to-maximum refresh range over which variable refresh rate operates.
Ergonomics & design
The width-to-height ratio (e.g. 16:9, 21:9).
The curve radius (e.g. 1000R); blank for a flat panel.
Raise and lower the panel.
Angle the panel up and down.
Rotate the panel left and right.
Rotate to portrait orientation.
The VESA wall / arm mount pattern (e.g. 100 x 100 mm).
Connectivity
More HDMI inputs connect more devices.
The highest HDMI standard supported by the monitor.
DisplayPort inputs, preferred for high refresh rates.
The highest DisplayPort standard supported by the monitor.
A USB-C input, often with power delivery for laptops.
Charges a connected laptop over USB-C.
Built-in USB ports for peripherals.
Integrated speakers.
A 3.5 mm audio output for headphones or external speakers.
Control two computers with one keyboard and mouse.
Features
A built-in camera for video calls.
A built-in microphone for calls.
A wired network port for USB-C docking.
Shows inputs from two computers side by side.
Specs last verified August 26, 2026ASUS ROG Swift OLED PG27UCDM: 38 of 42 specs verified (90%)KOORUI S2741LM: 31 of 42 specs verified (74%)Unverified specs show as Unknown — never estimated, never scored
What reviewers say
The bottom line
The ASUS ROG Swift OLED PG27UCDM is the clear winner, scoring 92 to 62 on our VS Score. It leads on Picture, Gaming and Features.
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