Between the Z27k G3 4K USB-C and UltraGear 27GX790A-B, the Z27k G3 4K USB-C comes out ahead in usb-c power delivery and screen size, while the UltraGear 27GX790A-B wins on refresh rate and peak brightness. Overall, the Z27k G3 4K USB-C scores 59 and the UltraGear 27GX790A-B scores 72.6 on our Mars Score.
Which should you buy?
The UltraGear 27GX790A-B is the clear pick on raw spec strength, leading by 13.6 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 Z27k G3 4K USB-C 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.
Pick the UltraGear 27GX790A-B if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are refresh rate, peak brightness, response time (gtg), among others.
There are no meaningful ties on the headline specs — every popular-comparison metric has a winner.
Bottom line: the UltraGear 27GX790A-B is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why HP - Z27k G3 4K USB-C wins
- ▲USB-C Power Delivery — 53.85% more. 100 W vs 65 W.
- ▲Screen size — 1.89% more. 27 " vs 26.5 ".
Why LG - UltraGear 27GX790A-B wins
- ▲Refresh rate — 700.00% more. 480 Hz vs 60 Hz.
- ▲Peak brightness — 225.00% more. 1300 nits vs 400 nits.
- ▲Response time (GtG) — 99.40% less. 0.03 ms vs 5 ms.
- ▲Has G-Sync.
- ▲Has FreeSync.
- ▲DCI-P3 coverage — 0.51% more. 98.5 % vs 98 %.
- ▲Panel type: OLED (vs IPS).
Spec comparison
Panel
| Spec | HP - Z27k G3 4K USB-C | LG - UltraGear 27GX790A-B |
|---|---|---|
| Screen sizeⓘ | 27 "lead | 26.5 " |
| Panel typeⓘ | IPS | OLEDlead |
| Resolutionⓘ | 4Klead | 1440p |
| Aspect ratioⓘ | 16:9 | 16:9 |
| Curvedⓘ | false | false |
Performance
| Spec | HP - Z27k G3 4K USB-C | LG - UltraGear 27GX790A-B |
|---|---|---|
| Refresh rateⓘ | 60 Hz | 480 Hzlead |
| Response time (GtG)ⓘ | 5 ms | 0.03 mslead |
| Peak brightnessⓘ | 400 nits | 1300 nitslead |
| DCI-P3 coverageⓘ | 98 % | 98.5 %lead |
| HDRⓘ | true | true |
| G-Syncⓘ | false | truelead |
| FreeSyncⓘ | false | truelead |
Connectivity
| Spec | HP - Z27k G3 4K USB-C | LG - UltraGear 27GX790A-B |
|---|---|---|
| HDMI ports | 1 | 2lead |
| DisplayPort ports | 1 | 1 |
| USB-C input | true | true |
| USB-C Power Deliveryⓘ | 100 Wlead | 65 W |
| KVM | truelead | false |
Frequently asked
Which has higher refresh rate, Z27k G3 4K USB-C or UltraGear 27GX790A-B?+
UltraGear 27GX790A-B refreshes at 480Hz vs 60Hz.
Which has faster response time, Z27k G3 4K USB-C or UltraGear 27GX790A-B?+
UltraGear 27GX790A-B responds in 0.03ms vs 5ms.
Does Z27k G3 4K USB-C or UltraGear 27GX790A-B have USB-C with power delivery?+
Both offer USB-C PD — 100W on Z27k G3 4K USB-C, 65W on UltraGear 27GX790A-B.
Spec-level deep dives
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