ASUS - ROG Swift PG34WCDM vs Samsung - ViewFinity S9 (S90PC)
Between the ROG Swift PG34WCDM and ViewFinity S9 (S90PC), the ROG Swift PG34WCDM comes out ahead in refresh rate and peak brightness, while the ViewFinity S9 (S90PC) wins on several specs. Overall, the ROG Swift PG34WCDM scores 75.1 and the ViewFinity S9 (S90PC) scores 59.3 on our Mars Score.
Which should you buy?
The ROG Swift PG34WCDM is the clear pick on raw spec strength, leading by 15.8 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the ROG Swift PG34WCDM if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. The biggest gaps in its favor are refresh rate, peak brightness, response time (gtg), among others.
The ViewFinity S9 (S90PC) similarly doesn't carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable dci-p3 coverage, usb-c power delivery, so those specs don't separate the two — focus on the differences below.
Bottom line: the ROG Swift PG34WCDM is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why ASUS - ROG Swift PG34WCDM wins
- ▲Refresh rate — 300.00% more. 240 Hz vs 60 Hz.
- ▲Peak brightness — 116.67% more. 1300 nits vs 600 nits.
- ▲Response time (GtG) — 99.40% less. 0.03 ms vs 5 ms.
- ▲Screen size — 25.93% more. 34 " vs 27 ".
- ▲Has G-Sync.
- ▲Has FreeSync.
- ▲Panel type: QD-OLED (vs IPS).
Why Samsung - ViewFinity S9 (S90PC) wins
- No decisive advantages.
Spec comparison
Panel
| Spec | ASUS - ROG Swift PG34WCDM | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| Screen sizeⓘ | 34 "lead | 27 " |
| Panel typeⓘ | QD-OLEDlead | IPS |
| Resolutionⓘ | 1440p | 5Klead |
| Aspect ratioⓘ | 21:9 | 16:9 |
| Curvedⓘ | truelead | false |
Performance
| Spec | ASUS - ROG Swift PG34WCDM | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| Refresh rateⓘ | 240 Hzlead | 60 Hz |
| Response time (GtG)ⓘ | 0.03 mslead | 5 ms |
| Peak brightnessⓘ | 1300 nitslead | 600 nits |
| DCI-P3 coverageⓘ | 99 % | 99 % |
| HDRⓘ | true | true |
| G-Syncⓘ | truelead | false |
| FreeSyncⓘ | truelead | false |
Connectivity
| Spec | ASUS - ROG Swift PG34WCDM | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| HDMI ports | 2lead | 1 |
| DisplayPort ports | 1lead | 0 |
| USB-C input | true | true |
| USB-C Power Deliveryⓘ | 90 W | 90 W |
| KVM | truelead | false |
Frequently asked
Which has higher refresh rate, ROG Swift PG34WCDM or ViewFinity S9 (S90PC)?+
ROG Swift PG34WCDM refreshes at 240Hz vs 60Hz.
Which has faster response time, ROG Swift PG34WCDM or ViewFinity S9 (S90PC)?+
ROG Swift PG34WCDM responds in 0.03ms vs 5ms.
Does ROG Swift PG34WCDM or ViewFinity S9 (S90PC) have USB-C with power delivery?+
Both offer USB-C PD — 90W on ROG Swift PG34WCDM, 90W on ViewFinity S9 (S90PC).
Spec-level deep dives
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