Piqelo Monitors.
Full Piqelo Review · US market

ASUS ROG Swift OLED PG34WCDN

A 34-inch 3440x1440 360Hz Tandem QD-OLED ultrawide combining very fast gaming with USB-C 90W and KVM support.

Size
34"
Resolution
3440x1440
Panel
Tandem QD-OLED
Refresh
360Hz
USB-C 90WKVMHDMI 2.1
Piqelo ScoreReview in progressOur overall product assessment
Search ScoreResearchingMatch to your preferences

Review in progress

How these scores work

The Piqelo Score is our published assessment of this exact product, including value. Your search does not change it. The Search Score uses the underlying research, your preferences and comparison with similarly priced products. Value is counted once; budget and required features are hard limits.

Price comparison: $974.25 to $1,623.75 (±25% of this product’s price). Comparable evidence is limited.

Match evidence or required features still need confirmation.

Find my best-fit monitor →Compare monitors
ASUS ROG Swift OLED PG34WCDN
Decision snapshot

Premium ultrawide OLED

Best for: Immersive ultrawide gaming with high refresh and a USB-C/KVM desk

Think twice if: You need 4K-class vertical detail or broad 16:9 game compatibility

PC gamingCreatorMixed useMac / USB-C
Plus points
  • 360Hz OLED delivers exceptionally sharp ultrawide motion
  • Tandem QD-OLED provides deep blacks and vivid HDR color
  • 90W USB-C and KVM make it useful beyond a gaming-only desk
Keep in mind
  • 21:9 support still varies by game and application
  • 3440x1440 is less vertically dense than 4K productivity displays
  • OLED care remains relevant for static-heavy desktop use
At a glance

Pros and cons

The main reasons to choose it, and the compromises to weigh up.

What we like

  • 360Hz OLED delivers exceptionally sharp ultrawide motion
  • Tandem QD-OLED provides deep blacks and vivid HDR color
  • 90W USB-C and KVM make it useful beyond a gaming-only desk

Keep in mind

  • 21:9 support still varies by game and application
  • 3440x1440 is less vertically dense than 4K productivity displays
  • OLED care remains relevant for static-heavy desktop use
Test results

Image quality, explained

Selected independent measurements, with what they mean in everyday use. Picture mode and test method matter; these results are not additional Piqelo scores.

Everyday brightness

Higher = brighter
SDR brightness
260 nitsdefault User
SDR brightness
260 nitsUser/default

SDR is everyday desktop content. More brightness can help in a lit room; reflections and the size of the bright area still matter.

These percentages describe gamut extent, rather than color-space coverage.

One independently tested sample; lab settings and methods affect results.

Tom's GuideRead the test ↗

HDR highlights

Higher = brighter highlights
HDR brightness
481 nitsConsole HDR · 10% window
HDR brightness
347 nitsConsole HDR · 40% window
HDR brightness
280 nitsConsole HDR · 100% window

HDR measures bright highlights in games and video. A small-window peak is different from full-screen brightness, so check the window and mode.

Tom's GuideRead the test ↗

Color accuracy

Lower ΔE = less error
Grayscale error · ΔE
0.62 DeltaEReported grayscale comparison

Delta E measures the difference from the target color or gray. A calibrated result describes that setup; it does not establish factory accuracy.

One independently tested sample; lab settings and methods affect results.

Tom's HardwareRead the test ↗

Motion & delay

Lower time = faster
Black-to-white response
0.24 msOne-inch square

Pixel response affects moving edges. Input lag is delay before the image starts changing; screen draw and signal processing are separate tests. Compare like-for-like methods.

Response, signal processing and total lag are different metrics; do not compare across lab methods.

Tom's HardwareRead the test ↗

No independent measured result in this profile yet for black depth & contrast, color range, screen consistency.

Explore all findings, test settings and sources
Close alternatives

When another monitor makes more sense

Piqelo does not force one universal winner. These are the closest researched alternatives when your priorities shift.

Research & detailsSources, measurements and full specificationsHide details
Decision confidence

How stable is this recommendation?

Confidence and evidence maturity stay separate from product fit and commerce.

Recommendation stabilityHighMultiple independent sources support a high-confidence exact-model profile.
Owner evidencePendingNo exact-model owner rating is being inferred.
Current buying routes3Commerce never changes the recommendation order.
Product views
ASUS ROG Swift OLED PG34WCDN
Key specifications

The attributes that change the decision

Specs are kept separate from judgment so a fast number does not hide a practical trade-off.

Screen34"
Resolution3440x1440
PanelTandem QD-OLED
Refresh360Hz
Response0.03 ms GTG
HDMI 2.1Yes
USB-C power90W
KVMYes
Transparent research

Sources behind this profile

Independent expert testing, exact-model owner signals and manufacturer specifications are visibly separated. Piqelo never counts itself as product evidence.

Manufacturer specification sourceASUS evidence for ASUS ROG Swift OLED PG34WCDN.Checked 2026-09-28Open exact source →
Independent expert sourceRTINGS evidence for ASUS ROG Swift OLED PG34WCDN.Checked 2026-09-28Open exact source →
Independent expert sourceHands-on ultrawide review finds sharp RGB-stripe text, fast motion and useful connectivity. High pricing and absent speakers are compromises.Checked 2026-09-30Open exact source →
Independent expert sourceIndependent exact-model review highlights the 34-inch OLED panel, 360Hz motion performance and straightforward interface, with high pricing as the main trade-off.Checked 2026-10-07Open exact source →
Independent expert sourceExact-model 34-inch 360Hz QD-OLED test reports sharp RGB-stripe rendering, bright accurate imagery and low lag. No built-in speakers.Checked 2026-10-07Open exact source →
From evidence to Piqelo Rating

What is still needed for a Piqelo Rating

Expert 50% · Owners 25% · Reliability 15% · Value 10%. The rating appears when all four components are supported.

Expert performance
4 eligible test sources collected. Performance calibration is still required.
Owner experience
At least 30 eligible exact-model owner reviews are needed; 0 are currently available.
Reliability
A supported reliability calculation needs model maturity, recurring risks and eligible owner evidence.
Current value
A current US price is available. Comparison with a supported peer group is still required.

Exact-model findings and measurements

Supported finding · motion response

Tom's Guide highlights very smooth 360Hz OLED gaming performance on the 34-inch ultrawide panel.

Tom's Guide Open exact source →
Supported finding · connectivity

The hands-on review praised connectivity but noted the lack of built-in speakers.

Stuff Open exact source →
Supported finding · hdr image

Tom’s Guide measured Console HDR at 481 nits for a 10% window, 347 nits at 40%, and 280 nits full-screen. Gaming HDR measured 457, 344 and 281 nits at the same sizes.

HDR brightness
481 nitsConsole HDR · 10% window
HDR brightness
347 nitsConsole HDR · 40% window
HDR brightness
280 nitsConsole HDR · 100% window
Tom's Guide Open exact source →
Supported finding · sdr image

The PG34WCDN lab table measured 260 nits in its default User mode. Reported sRGB and DCI-P3 percentages exceed 100% and describe oversaturation; they must not be stored as bounded gamut coverage.

SDR brightness
260 nitsdefault User

Do not interpret publisher gamut percentages above 100 as color-space coverage.

Tom's Guide Open exact source →
Supported finding · motion

Tom's Hardware reported 0.24 ms black-to-white transition (One-inch square); 10.3 ms total control lag (Nvidia LDAT; mean of 25 clicks).

Black-to-white response
0.24 msOne-inch square
total control lag
10.3 msNvidia LDAT; mean of 25 clicks · mean

Response, signal processing and total lag are different metrics; do not compare across lab methods.

Tom's Hardware Open exact source →
Supported finding · color

The grayscale comparison reported 0.62 dE and gamma 2.18. The sRGB gamut test returned 1.08 dE.

Grayscale error · ΔE
0.62 DeltaEReported grayscale comparison
Gamma
2.18 gammaReported gamma comparison
gamut delta e
1.08 DeltaEsRGB

One independently tested sample; lab settings and methods affect results.

Tom's Hardware Open exact source →
Supported finding · color

Tom's Guide reported Delta-E 0.26 and gamut extent 200.7% sRGB / 142.2% DCI-P3.

Average color error · ΔE
0.26 DeltaEUser/default
color gamut volume
200.7%User/default · sRGB
color gamut volume
142.2%User/default · DCI-P3

Gamut extent/volume must not be presented as absolute coverage; the Delta-E method is source-specific.

Tom's Guide Open exact source →
Supported finding · sdr image

Tom's Guide measured SDR 260 nits (User/default).

SDR brightness
260 nitsUser/default

One independently tested sample; lab settings and methods affect results.

Tom's Guide Open exact source →
Supported finding · hdr image

Tom's Guide measured HDR 458 nits (Cinema HDR); HDR 344 nits (Cinema HDR); HDR 279 nits (Cinema HDR); HDR 457 nits (HDR 500 True Black); HDR 346 nits (HDR 500 True Black); HDR 280 nits (HDR 500 True Black).

HDR brightness
458 nitsCinema HDR · 10% window
HDR brightness
344 nitsCinema HDR · 40% window
HDR brightness
279 nitsCinema HDR · 100% window
HDR brightness
457 nitsHDR 500 True Black · 10% window
HDR brightness
346 nitsHDR 500 True Black · 40% window

One independently tested sample; lab settings and methods affect results.

Tom's Guide Open exact source →
Next steps

Put this monitor in context

Independent test resultsBrightness, color and motion, with exact test settings →Best Monitors researchExplore the full research set →Best Gaming Monitors 2026: OLED, 1440p & 4K | PiqeloExplore monitors matching this specification →Best OLED Monitors 2026Explore monitors matching this specification →Best 1440p Monitors 2026Explore monitors matching this specification →Compare this exact monitorChoose a second monitor →
Trust & transparencyIndependent by design.

Some retailer links may be affiliate links. Commercial relationships never buy a score, recommendation, award or retailer order. As an Amazon Associate I earn from qualifying purchases.