Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | MSI - MPG 271QRX | LG - UltraGear 27GX790A-B |
|---|---|---|
| USB-C Power Delivery | 98 W | 65 W |
| Refresh rate | 360 Hz | 480 Hz |
| Peak brightness | 1000 nits | 1300 nits |
| Screen size | 27 " | 26.5 " |
| DCI-P3 coverage | 99 % | 98.5 % |
| Panel type | QD-OLED | OLED |
Between the MPG 271QRX and UltraGear 27GX790A-B, the MPG 271QRX comes out ahead in usb-c power delivery / screen size, while the UltraGear 27GX790A-B wins on refresh rate / peak brightness. Overall, the MPG 271QRX scores 76.9 and the UltraGear 27GX790A-B scores 77.6 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (76.9 vs 77.6). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the MPG 271QRX 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 usb-c power delivery, screen size, dci-p3 coverage, among others. The single most decisive one: USB-C Power Delivery — 50.77% more. 98 W vs 65 W.
Pick the UltraGear 27GX790A-B if you care most about refresh rate / peak brightness. Its strongest claims are refresh rate, peak brightness. The single most decisive one: Refresh rate — 33.33% more. 480 Hz vs 360 Hz.
Both ship with comparable response time (gtg), g-sync, freesync, 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: MSI - MPG 271QRX or LG - UltraGear 27GX790A-B?
LG - UltraGear 27GX790A-B leads the current Mars Score by 0.7 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 MSI - MPG 271QRX if…
MSI - MPG 271QRX has the measurable edge on has usb c pd w, screen size in, color gamut dci p3 pct.
Choose LG - UltraGear 27GX790A-B if…
LG - UltraGear 27GX790A-B has the measurable edge on refresh rate hz, peak brightness nits.
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 MSI - MPG 271QRX wins
- ▲USB-C Power Delivery — 50.77% more. 98 W vs 65 W.
- ▲Screen size — 1.89% more. 27 " vs 26.5 ".
- ▲DCI-P3 coverage — 0.51% more. 99 % vs 98.5 %.
- ▲Panel type: QD-OLED (vs OLED).
Why LG - UltraGear 27GX790A-B wins
- ▲Refresh rate — 33.33% more. 480 Hz vs 360 Hz.
- ▲Peak brightness — 30.00% more. 1300 nits vs 1000 nits.
Spec comparison
Panel
| Spec | MSI - MPG 271QRX | LG - UltraGear 27GX790A-B |
|---|---|---|
| Screen size | 27 "lead | 26.5 " |
| Panel typeⓘ | QD-OLEDlead | OLED |
| Resolutionⓘ | 1440p | 1440p |
| Aspect ratioⓘ | 16:9 | 16:9 |
| Curvedⓘ | false | false |
Performance
| Spec | MSI - MPG 271QRX | LG - UltraGear 27GX790A-B |
|---|---|---|
| Refresh rateⓘ | 360 Hz | 480 Hzlead |
| Response time (GtG)ⓘ | 0.03 ms | 0.03 ms |
| Peak brightnessⓘ | 1000 nits | 1300 nitslead |
| DCI-P3 coverageⓘ | 99 %lead | 98.5 % |
| HDRⓘ | true | true |
| G-Syncⓘ | true | true |
| FreeSyncⓘ | true | true |
Connectivity
| Spec | MSI - MPG 271QRX | LG - UltraGear 27GX790A-B |
|---|---|---|
| HDMI ports | 2 | 2 |
| DisplayPort ports | 1 | 1 |
| USB-C inputⓘ | true | true |
| USB-C Power Deliveryⓘ | 98 Wlead | 65 W |
| KVM | truelead | false |
Frequently asked
Which has higher refresh rate, MPG 271QRX or UltraGear 27GX790A-B?+
UltraGear 27GX790A-B refreshes at 480Hz vs 360Hz.
Which has faster response time, MPG 271QRX or UltraGear 27GX790A-B?+
UltraGear 27GX790A-B responds in 0.03ms vs 0.03ms.
Does MPG 271QRX or UltraGear 27GX790A-B have USB-C with power delivery?+
Both offer USB-C PD — 98W on MPG 271QRX, 65W on UltraGear 27GX790A-B.