Samsung - Odyssey OLED G8 (G80SD) vs LG - UltraGear 27GX790A-B
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Samsung - Odyssey OLED G8 (G80SD) | LG - UltraGear 27GX790A-B |
|---|---|---|
| Refresh rate | 240 Hz | 480 Hz |
| Peak brightness | 1000 nits | 1300 nits |
| Screen size | 32 " | 26.5 " |
| G-Sync | false | true |
| DCI-P3 coverage | 99 % | 98.5 % |
| Panel type | QD-OLED | OLED |
Between the Odyssey OLED G8 (G80SD) and UltraGear 27GX790A-B, the Odyssey OLED G8 (G80SD) comes out ahead in screen size / dci-p3 coverage, while the UltraGear 27GX790A-B wins on refresh rate / peak brightness. Overall, the Odyssey OLED G8 (G80SD) scores 78.2 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 (78.2 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 Odyssey OLED G8 (G80SD) 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 screen size, dci-p3 coverage, panel type. The single most decisive one: Screen size — 20.75% more. 32 " vs 26.5 ".
Pick the UltraGear 27GX790A-B if you care most about refresh rate / peak brightness. Its strongest claims are refresh rate, peak brightness, g-sync, among others. The single most decisive one: Refresh rate — 100.00% more. 480 Hz vs 240 Hz.
Both ship with comparable response time (gtg), 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: Samsung - Odyssey OLED G8 (G80SD) or LG - UltraGear 27GX790A-B?
Samsung - Odyssey OLED G8 (G80SD) leads the current Mars Score by 0.6 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 Samsung - Odyssey OLED G8 (G80SD) if…
Samsung - Odyssey OLED G8 (G80SD) has the measurable edge on screen size in, color gamut dci p3 pct, panel type.
Choose LG - UltraGear 27GX790A-B if…
LG - UltraGear 27GX790A-B has the measurable edge on refresh rate hz, peak brightness nits, has g sync.
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 Samsung - Odyssey OLED G8 (G80SD) wins
- ▲Screen size — 20.75% more. 32 " 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 — 100.00% more. 480 Hz vs 240 Hz.
- ▲Peak brightness — 30.00% more. 1300 nits vs 1000 nits.
- ▲Has G-Sync.
- ▲USB-C Power Delivery: 65 W vs 0 W.
Spec comparison
Panel
| Spec | Samsung - Odyssey OLED G8 (G80SD) | LG - UltraGear 27GX790A-B |
|---|---|---|
| Screen size | 32 "lead | 26.5 " |
| Panel typeⓘ | QD-OLEDlead | OLED |
| Resolutionⓘ | 4Klead | 1440p |
| Aspect ratioⓘ | 16:9 | 16:9 |
| Curvedⓘ | false | false |
Performance
| Spec | Samsung - Odyssey OLED G8 (G80SD) | LG - UltraGear 27GX790A-B |
|---|---|---|
| Refresh rateⓘ | 240 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ⓘ | false | truelead |
| FreeSyncⓘ | true | true |
Connectivity
| Spec | Samsung - Odyssey OLED G8 (G80SD) | LG - UltraGear 27GX790A-B |
|---|---|---|
| HDMI ports | 1 | 2lead |
| DisplayPort ports | 1 | 1 |
| USB-C inputⓘ | false | truelead |
| USB-C Power Deliveryⓘ | 0 W | 65 Wlead |
| KVM | false | false |
Frequently asked
Which has higher refresh rate, Odyssey OLED G8 (G80SD) or UltraGear 27GX790A-B?+
UltraGear 27GX790A-B refreshes at 480Hz vs 240Hz.
Which has faster response time, Odyssey OLED G8 (G80SD) or UltraGear 27GX790A-B?+
UltraGear 27GX790A-B responds in 0.03ms vs 0.03ms.
Does Odyssey OLED G8 (G80SD) or UltraGear 27GX790A-B have USB-C with power delivery?+
UltraGear 27GX790A-B offers USB-C with 65W power delivery.