Between the Z27k G3 4K USB-C and MPG 321URX, the Z27k G3 4K USB-C comes out ahead in usb-c power delivery, while the MPG 321URX wins on refresh rate and peak brightness. Overall, the Z27k G3 4K USB-C scores 59 and the MPG 321URX scores 73.2 on our Mars Score.
Which should you buy?
The MPG 321URX is the clear pick on raw spec strength, leading by 14.2 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 MPG 321URX 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 MPG 321URX 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 — 2.04% more. 100 W vs 98 W.
Why MSI - MPG 321URX wins
- ▲Refresh rate — 300.00% more. 240 Hz vs 60 Hz.
- ▲Peak brightness — 150.00% more. 1000 nits vs 400 nits.
- ▲Response time (GtG) — 99.40% less. 0.03 ms vs 5 ms.
- ▲Screen size — 18.52% more. 32 " vs 27 ".
- ▲DCI-P3 coverage — 1.02% more. 99 % vs 98 %.
- ▲Has G-Sync.
- ▲Has FreeSync.
- ▲Panel type: QD-OLED (vs IPS).
Spec comparison
Panel
| Spec | HP - Z27k G3 4K USB-C | MSI - MPG 321URX |
|---|---|---|
| Screen sizeⓘ | 27 " | 32 "lead |
| Panel typeⓘ | IPS | QD-OLEDlead |
| Resolutionⓘ | 4K | 4K |
| Aspect ratioⓘ | 16:9 | 16:9 |
| Curvedⓘ | false | false |
Performance
| Spec | HP - Z27k G3 4K USB-C | MSI - MPG 321URX |
|---|---|---|
| Refresh rateⓘ | 60 Hz | 240 Hzlead |
| Response time (GtG)ⓘ | 5 ms | 0.03 mslead |
| Peak brightnessⓘ | 400 nits | 1000 nitslead |
| DCI-P3 coverageⓘ | 98 % | 99 %lead |
| HDRⓘ | true | true |
| G-Syncⓘ | false | truelead |
| FreeSyncⓘ | false | truelead |
Connectivity
| Spec | HP - Z27k G3 4K USB-C | MSI - MPG 321URX |
|---|---|---|
| HDMI ports | 1 | 2lead |
| DisplayPort ports | 1 | 1 |
| USB-C input | true | true |
| USB-C Power Deliveryⓘ | 100 Wlead | 98 W |
| KVM | true | true |
Frequently asked
Which has higher refresh rate, Z27k G3 4K USB-C or MPG 321URX?+
MPG 321URX refreshes at 240Hz vs 60Hz.
Which has faster response time, Z27k G3 4K USB-C or MPG 321URX?+
MPG 321URX responds in 0.03ms vs 5ms.
Does Z27k G3 4K USB-C or MPG 321URX have USB-C with power delivery?+
Both offer USB-C PD — 100W on Z27k G3 4K USB-C, 98W on MPG 321URX.
Spec-level deep dives
More from the same brands
vsMars is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no extra cost to you. Learn more.