Between the M27Q X and ViewFinity S9 (S90PC), the M27Q X comes out ahead in refresh rate / response time (gtg), while the ViewFinity S9 (S90PC) wins on usb-c power delivery / peak brightness. Overall, the M27Q X scores 65.7 and the ViewFinity S9 (S90PC) scores 59.3 on our Mars Score.
Which should you buy?
The M27Q X edges ahead on the Mars Score (65.7 vs 59.3), but the 6.4-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the M27Q X 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, response time (gtg), g-sync, among others.
Pick the ViewFinity S9 (S90PC) if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are usb-c power delivery, peak brightness, dci-p3 coverage.
Both ship with comparable screen size, panel type, so those specs do not separate the two — focus on the differences below.
Bottom line: the M27Q X is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Gigabyte - M27Q X wins
- ▲Refresh rate — 300.00% more. 240 Hz vs 60 Hz.
- ▲Response time (GtG) — 94.00% less. 0.3 ms vs 5 ms.
- ▲Has G-Sync.
- ▲Has FreeSync.
Why Samsung - ViewFinity S9 (S90PC) wins
- ▲USB-C Power Delivery — 500.00% more. 90 W vs 15 W.
- ▲Peak brightness — 50.00% more. 600 nits vs 400 nits.
- ▲DCI-P3 coverage — 7.61% more. 99 % vs 92 %.
Spec comparison
Panel
| Spec | Gigabyte - M27Q X | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| Screen sizeⓘ | 27 " | 27 " |
| Panel typeⓘ | IPS | IPS |
| Resolutionⓘ | 1440p | 5Klead |
| Aspect ratioⓘ | 16:9 | 16:9 |
| Curvedⓘ | false | false |
Performance
| Spec | Gigabyte - M27Q X | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| Refresh rateⓘ | 240 Hzlead | 60 Hz |
| Response time (GtG)ⓘ | 0.3 mslead | 5 ms |
| Peak brightnessⓘ | 400 nits | 600 nitslead |
| DCI-P3 coverageⓘ | 92 % | 99 %lead |
| HDRⓘ | true | true |
| G-Syncⓘ | truelead | false |
| FreeSyncⓘ | truelead | false |
Connectivity
| Spec | Gigabyte - M27Q X | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| HDMI ports | 2lead | 1 |
| DisplayPort ports | 1lead | 0 |
| USB-C input | true | true |
| USB-C Power Deliveryⓘ | 15 W | 90 Wlead |
| KVM | truelead | false |
Frequently asked
Which has higher refresh rate, M27Q X or ViewFinity S9 (S90PC)?+
M27Q X refreshes at 240Hz vs 60Hz.
Which has faster response time, M27Q X or ViewFinity S9 (S90PC)?+
M27Q X responds in 0.3ms vs 5ms.
Does M27Q X or ViewFinity S9 (S90PC) have USB-C with power delivery?+
Both offer USB-C PD — 15W on M27Q X, 90W on ViewFinity S9 (S90PC).
Spec-level deep dives
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