Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Gigabyte - M27Q X | LG - UltraGear 45GX950A-B |
|---|---|---|
| USB-C Power Delivery | 15 W | 90 W |
| Peak brightness | 400 nits | 1300 nits |
| Response time (GtG) | 0.3 ms | 0.03 ms |
| Screen size | 27 " | 45 " |
| Refresh rate | 240 Hz | 165 Hz |
| DCI-P3 coverage | 92 % | 98.5 % |
Between the M27Q X and UltraGear 45GX950A-B, the M27Q X comes out ahead in refresh rate, while the UltraGear 45GX950A-B wins on usb-c power delivery / peak brightness. Overall, the M27Q X scores 67.6 and the UltraGear 45GX950A-B scores 81.4 on our Mars Score.
Which should you buy?
The UltraGear 45GX950A-B is the clear pick on raw spec strength, leading by 13.8 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 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. The single most decisive one: Refresh rate — 45.45% more. 240 Hz vs 165 Hz.
Pick the UltraGear 45GX950A-B if you care most about usb-c power delivery / peak brightness. Its strongest claims are usb-c power delivery, peak brightness, response time (gtg), among others. The single most decisive one: USB-C Power Delivery — 500.00% more. 90 W vs 15 W.
Both ship with comparable g-sync, freesync, so those specs do not separate the two — focus on the differences below.
Bottom line: the UltraGear 45GX950A-B is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Gigabyte - M27Q X or LG - UltraGear 45GX950A-B?
LG - UltraGear 45GX950A-B leads the current Mars Score by 13.8 points.The more useful decision is the trade-off behind that result: compare screen size, refresh rate, panel type 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.
Choose LG - UltraGear 45GX950A-B if…
LG - UltraGear 45GX950A-B has the measurable edge on has usb c pd w, peak brightness nits, response time ms.
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 — 45.45% more. 240 Hz vs 165 Hz.
Why LG - UltraGear 45GX950A-B wins
- ▲USB-C Power Delivery — 500.00% more. 90 W vs 15 W.
- ▲Peak brightness — 225.00% more. 1300 nits vs 400 nits.
- ▲Response time (GtG) — 90.00% less. 0.03 ms vs 0.3 ms.
- ▲Screen size — 66.67% more. 45 " vs 27 ".
- ▲DCI-P3 coverage — 7.07% more. 98.5 % vs 92 %.
- ▲Panel type: OLED (vs IPS).
Spec comparison
Panel
| Spec | Gigabyte - M27Q X | LG - UltraGear 45GX950A-B |
|---|---|---|
| Screen size | 27 " | 45 "lead |
| Panel typeⓘ | IPS | OLEDlead |
| Resolutionⓘ | 1440p | 5Klead |
| Aspect ratioⓘ | 16:9 | 21:9 |
| Curvedⓘ | false | truelead |
Performance
| Spec | Gigabyte - M27Q X | LG - UltraGear 45GX950A-B |
|---|---|---|
| Refresh rateⓘ | 240 Hzlead | 165 Hz |
| Response time (GtG)ⓘ | 0.3 ms | 0.03 mslead |
| Peak brightnessⓘ | 400 nits | 1300 nitslead |
| DCI-P3 coverageⓘ | 92 % | 98.5 %lead |
| HDRⓘ | true | true |
| G-Syncⓘ | true | true |
| FreeSyncⓘ | true | true |
Connectivity
| Spec | Gigabyte - M27Q X | LG - UltraGear 45GX950A-B |
|---|---|---|
| HDMI ports | 2 | 2 |
| DisplayPort ports | 1 | 1 |
| USB-C inputⓘ | true | true |
| USB-C Power Deliveryⓘ | 15 W | 90 Wlead |
| KVM | true | true |
Frequently asked
Which has higher refresh rate, M27Q X or UltraGear 45GX950A-B?+
M27Q X refreshes at 240Hz vs 165Hz.
Which has faster response time, M27Q X or UltraGear 45GX950A-B?+
UltraGear 45GX950A-B responds in 0.03ms vs 0.3ms.
Does M27Q X or UltraGear 45GX950A-B have USB-C with power delivery?+
Both offer USB-C PD — 15W on M27Q X, 90W on UltraGear 45GX950A-B.