Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Gigabyte - M27Q X | HP - Z27k G3 4K USB-C |
|---|---|---|
| USB-C Power Delivery | 15 W | 100 W |
| Refresh rate | 240 Hz | 60 Hz |
| Response time (GtG) | 0.3 ms | 5 ms |
| DCI-P3 coverage | 92 % | 98 % |
| G-Sync | true | false |
| FreeSync | true | false |
Between the M27Q X and Z27k G3 4K USB-C, the M27Q X comes out ahead in refresh rate / response time (gtg), while the Z27k G3 4K USB-C wins on usb-c power delivery / dci-p3 coverage. Overall, the M27Q X scores 67.6 and the Z27k G3 4K USB-C scores 63.3 on our Mars Score.
Which should you buy?
The M27Q X edges ahead on the Mars Score (67.6 vs 63.3), but the 4.3-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. The single most decisive one: Refresh rate — 300.00% more. 240 Hz vs 60 Hz.
Pick the Z27k G3 4K USB-C if you care most about usb-c power delivery / dci-p3 coverage. Its strongest claims are usb-c power delivery, dci-p3 coverage. The single most decisive one: USB-C Power Delivery — 566.67% more. 100 W vs 15 W.
Both ship with comparable peak brightness, 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 HP - Z27k G3 4K USB-C?
Gigabyte - M27Q X leads the current Mars Score by 4.3 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 HP - Z27k G3 4K USB-C if…
HP - Z27k G3 4K USB-C has the measurable edge on has usb c pd w, 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 HP - Z27k G3 4K USB-C wins
- ▲USB-C Power Delivery — 566.67% more. 100 W vs 15 W.
- ▲DCI-P3 coverage — 6.52% more. 98 % vs 92 %.
Spec comparison
Panel
| Spec | Gigabyte - M27Q X | HP - Z27k G3 4K USB-C |
|---|---|---|
| Screen size | 27 " | 27 " |
| Panel typeⓘ | IPS | IPS |
| Resolutionⓘ | 1440p | 4Klead |
| Aspect ratioⓘ | 16:9 | 16:9 |
| Curvedⓘ | false | false |
Performance
| Spec | Gigabyte - M27Q X | HP - Z27k G3 4K USB-C |
|---|---|---|
| Refresh rateⓘ | 240 Hzlead | 60 Hz |
| Response time (GtG)ⓘ | 0.3 mslead | 5 ms |
| Peak brightnessⓘ | 400 nits | 400 nits |
| DCI-P3 coverageⓘ | 92 % | 98 %lead |
| HDRⓘ | true | true |
| G-Syncⓘ | truelead | false |
| FreeSyncⓘ | truelead | false |
Connectivity
| Spec | Gigabyte - M27Q X | HP - Z27k G3 4K USB-C |
|---|---|---|
| HDMI ports | 2lead | 1 |
| DisplayPort ports | 1 | 1 |
| USB-C inputⓘ | true | true |
| USB-C Power Deliveryⓘ | 15 W | 100 Wlead |
| KVM | true | true |
Frequently asked
Which has higher refresh rate, M27Q X or Z27k G3 4K USB-C?+
M27Q X refreshes at 240Hz vs 60Hz.
Which has faster response time, M27Q X or Z27k G3 4K USB-C?+
M27Q X responds in 0.3ms vs 5ms.
Does M27Q X or Z27k G3 4K USB-C have USB-C with power delivery?+
Both offer USB-C PD — 15W on M27Q X, 100W on Z27k G3 4K USB-C.