Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Gigabyte - M27Q X | Samsung - ViewFinity S9 (S90PC) |
|---|---|---|
| USB-C Power Delivery | 15 W | 90 W |
| Refresh rate | 240 Hz | 60 Hz |
| Response time (GtG) | 0.3 ms | 5 ms |
| Peak brightness | 400 nits | 600 nits |
| DCI-P3 coverage | 92 % | 99 % |
| G-Sync | true | false |
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 67.6 and the ViewFinity S9 (S90PC) scores 65.9 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (67.6 vs 65.9). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
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. The single most decisive one: Refresh rate — 300.00% more. 240 Hz vs 60 Hz.
Pick the ViewFinity S9 (S90PC) if you care most about usb-c power delivery / peak brightness. Its strongest claims are usb-c power delivery, peak brightness, dci-p3 coverage. The single most decisive one: USB-C Power Delivery — 500.00% more. 90 W vs 15 W.
Both ship with comparable screen size, panel type, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Gigabyte - M27Q X or Samsung - ViewFinity S9 (S90PC)?
Gigabyte - M27Q X leads the current Mars Score by 1.7 points.The more useful decision is the trade-off behind that result: compare refresh rate against the way you will actually use the product.
Choose Gigabyte - M27Q X if…
Gigabyte - M27Q X has the measurable edge on refresh rate hz, response time ms, has g sync.
Choose Samsung - ViewFinity S9 (S90PC) if…
Samsung - ViewFinity S9 (S90PC) has the measurable edge on has usb c pd w, peak brightness nits, color gamut dci p3 pct.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
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).