Between the Z27k G3 4K USB-C and UltraGear 45GX950A-B, the Z27k G3 4K USB-C comes out ahead in usb-c power delivery, while the UltraGear 45GX950A-B wins on peak brightness / refresh rate. Overall, the Z27k G3 4K USB-C scores 59 and the UltraGear 45GX950A-B scores 83.8 on our Mars Score.
Which should you buy?
The UltraGear 45GX950A-B is the clear pick on raw spec strength, leading by 24.8 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 Z27k G3 4K USB-C if you care most about usb-c power delivery. The biggest gaps in its favor are usb-c power delivery.
Pick the UltraGear 45GX950A-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 peak brightness, refresh rate, 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 45GX950A-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 — 11.11% more. 100 W vs 90 W.
Why LG - UltraGear 45GX950A-B wins
- ▲Peak brightness — 225.00% more. 1300 nits vs 400 nits.
- ▲Refresh rate — 175.00% more. 165 Hz vs 60 Hz.
- ▲Response time (GtG) — 99.40% less. 0.03 ms vs 5 ms.
- ▲Screen size — 66.67% more. 45 " vs 27 ".
- ▲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 45GX950A-B |
|---|---|---|
| Screen sizeⓘ | 27 " | 45 "lead |
| Panel typeⓘ | IPS | OLEDlead |
| Resolutionⓘ | 4K | 5Klead |
| Aspect ratioⓘ | 16:9 | 21:9 |
| Curvedⓘ | false | truelead |
Performance
| Spec | HP - Z27k G3 4K USB-C | LG - UltraGear 45GX950A-B |
|---|---|---|
| Refresh rateⓘ | 60 Hz | 165 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 45GX950A-B |
|---|---|---|
| HDMI ports | 1 | 2lead |
| DisplayPort ports | 1 | 1 |
| USB-C input | true | true |
| USB-C Power Deliveryⓘ | 100 Wlead | 90 W |
| KVM | true | true |
Frequently asked
Which has higher refresh rate, Z27k G3 4K USB-C or UltraGear 45GX950A-B?+
UltraGear 45GX950A-B refreshes at 165Hz vs 60Hz.
Which has faster response time, Z27k G3 4K USB-C or UltraGear 45GX950A-B?+
UltraGear 45GX950A-B responds in 0.03ms vs 5ms.
Does Z27k G3 4K USB-C or UltraGear 45GX950A-B have USB-C with power delivery?+
Both offer USB-C PD — 100W on Z27k G3 4K USB-C, 90W on UltraGear 45GX950A-B.
Spec-level deep dives
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